377 lines
13 KiB
C
377 lines
13 KiB
C
/*
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* Copyright (c) 2010, Loughborough University - Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* Example to demonstrate-test the sensors functionality on
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* sensinode/cc2430 devices.
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*
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* B1 turns L2 on and off.
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* B2 reboots the node via the watchdog.
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*
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* The node takes readings from the various sensors every x seconds and
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* prints out the results.
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*
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* We use floats here to translate the AD conversion results to
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* meaningful values. However, our printf does not have %f support so
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* we use an ugly hack to print out the value by extracting the integral
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* part and then the fractional part. Don't try this at home.
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*
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* Temperature:
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* Math is correct, the sensor needs calibration per device.
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* I currently use default values for the math which may result in
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* very incorrect values in degrees C.
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* See TI Design Note DN102 about the offset calibration.
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*
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* Supply Voltage (VDD) and Battery Sensor:
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* For VDD, math is correct, conversion is correct. See DN101 for details if
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* interested.
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* Battery reports different values when we run it many times
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* in succession. The cause is unknown.
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* I am fairly confident that I have captured the connections on the
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* device correctly. I am however accepting input/feedback
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*
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* Light Sensor (Vishay Semiconductors TEPT4400):
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* I am uncertain about the math. This needs testing. All I know is
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* that 600lux = 0.9V and that the relation is linear. See inline for
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* more details
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*
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* Accelerometer (Freescale Semiconductor MMA7340L):
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* Math is correct but the sensor needs calibration. I've not
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* attempted one cause the reported values differ per device.
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* Place the N740 with the logo facing down to get 1g on the Z axis.
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* Place the antenna side facing down to get 1g on the Y axis
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* Place the N740 on its longer side while looking at the antenna and
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* the D connector. Antenna on the bottom, D connector on the top.
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* This should give you 1g on the X axis.
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*
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* Make sure you enable/disable things in contiki-conf.h
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*
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* \author
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* George Oikonomou - <oikonomou@users.sourceforge.net>
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*/
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#include "contiki.h"
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#include "contiki-conf.h"
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#include "net/rime.h"
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#include "dev/leds.h"
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#include "dev/watchdog.h"
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#include "lib/random.h"
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#if CONTIKI_TARGET_SENSINODE
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#include "dev/sensinode-sensors.h"
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#else
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#include "lib/sensors.h"
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#endif
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#define DEBUG 1
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#if DEBUG
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#include <stdio.h>
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#if CONTIKI_TARGET_SENSINODE
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#include "debug.h"
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#endif /* CONTIKI_TARGET_SENSINODE */
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#define PRINTF(...) printf(__VA_ARGS__)
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#else /* DEBUG */
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/* We overwrite (read as annihilate) all output functions here */
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#define PRINTF(...)
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#define putstring(...)
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#define putchar(...)
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#endif /* DEBUG */
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#define SEND_BATTERY_INFO 0
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#if SEND_BATTERY_INFO
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#include "sensors-example.h"
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static void
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bc_rx(struct broadcast_conn *c, const rimeaddr_t *from)
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{
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return;
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}
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static const struct broadcast_callbacks bc_cb = { bc_rx };
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static struct broadcast_conn bc_con;
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#endif
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#if BUTTON_SENSOR_ON
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extern const struct sensors_sensor button_1_sensor, button_2_sensor;
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#endif
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/*---------------------------------------------------------------------------*/
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PROCESS(sensors_test_process, "Sensor Test Process");
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#if (CONTIKI_TARGET_SENSINODE && BUTTON_SENSOR_ON)
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PROCESS(buttons_test_process, "Button Test Process");
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AUTOSTART_PROCESSES(&sensors_test_process, &buttons_test_process);
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#else
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AUTOSTART_PROCESSES(&sensors_test_process);
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#endif
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/*---------------------------------------------------------------------------*/
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#if BUTTON_SENSOR_ON
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PROCESS_THREAD(buttons_test_process, ev, data)
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{
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struct sensors_sensor *sensor;
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PROCESS_BEGIN();
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while(1) {
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PROCESS_WAIT_EVENT_UNTIL(ev == sensors_event);
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/* If we woke up after a sensor event, inform what happened */
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sensor = (struct sensors_sensor *)data;
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if(sensor == &button_1_sensor) {
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leds_toggle(LEDS_GREEN);
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} else if(sensor == &button_2_sensor) {
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watchdog_reboot();
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}
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}
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PROCESS_END();
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}
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#endif
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(sensors_test_process, ev, data)
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{
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static struct etimer et;
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#if SEND_BATTERY_INFO
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/* Node Time */
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static struct sensor_data sd;
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#endif
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/* Sensor Values */
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static int rv;
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static struct sensors_sensor *sensor;
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static float sane = 0;
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static int dec;
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static float frac;
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#if SEND_BATTERY_INFO
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PROCESS_EXITHANDLER(broadcast_close(&bc_con);)
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#endif
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PROCESS_BEGIN();
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putstring("========================\n");
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putstring("Starting Sensor Example.\n");
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putstring("========================\n");
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#if SEND_BATTERY_INFO
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broadcast_open(&bc_con, BATTERY_RIME_CHANNEL, &bc_cb);
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#endif
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/* Set an etimer. We take sensor readings when it expires and reset it. */
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etimer_set(&et, CLOCK_SECOND * 2);
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while(1) {
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PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
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/*
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* Request some ADC conversions
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* Return value -1 means sensor not available or turned off in conf
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*/
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sensor = sensors_find(ADC_SENSOR);
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if(sensor) {
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putstring("------------------\n");
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leds_on(LEDS_RED);
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/*
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* Temperature:
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* Using 1.25V ref. voltage (1250mV).
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* Typical Voltage at 0°C : 743 mV
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* Typical Co-efficient : 2.45 mV/°C
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* Offset at 25°C : 30 (this varies and needs calibration)
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*
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* Thus, at 12bit resolution:
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*
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* ADC x 1250 / 2047 - (743 + 30) 0.61065 x ADC - 773
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* T = ------------------------------ ~= ------------------- °C
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* 2.45 2.45
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*/
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rv = sensor->value(ADC_SENSOR_TYPE_TEMP);
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if(rv != -1) {
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sane = ((rv * 0.61065 - 773) / 2.45);
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dec = sane;
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frac = sane - dec;
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PRINTF(" Temp=%d.%02u C (%d)\n", dec, (unsigned int)(frac * 100),
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rv);
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}
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/*
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* Accelerometer: Freescale Semiconductor MMA7340L
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* Using 1.25V ref. voltage.
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* Sensitivity: 0.44 mV/g in ±3g mode.
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* 0.1175 mV/g in ±11g mode.
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* Typical 0g Vout = 1.65V (both modes, Vdd=3.3V, T=25°C)
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* ADC Input Voltage is 1/3 Accelerometer Output Voltage
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*
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* +3g -> 2.97V Acc Out -> 0.9900V ADC Input -> 1621
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* +1g -> 2.09V Acc Out -> 0.6967V ADC Input -> 1141
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* 0g -> 1.65V Acc Out -> 0.5500V ADC Input -> 901
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* -1g -> 1.21V Acc Out -> 0.4033V ADC Input -> 660
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* -3g -> 0.33V Acc Out -> 0.1100V ADC Input -> 180
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*
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* Thus, at 12bit resolution, ±3g mode:
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* ADC x 1.25 x 3
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* Vout = -------------- V
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* 2047
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*
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* Vout - 0g Vout - 1.65
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* Acc = ----------- = ----------- g
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* Sensitivity 0.44
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*
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* Similar calc. for ±11g with 0.1175V increments
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*
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* This is only valid if you set ACC_SENSOR_CONF_GSEL 0 in contiki-conf.h
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*/
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rv = sensor->value(ADC_SENSOR_TYPE_ACC_X);
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if(rv != -1) {
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sane = ((rv * 3.75 / 2047) - 1.65) / 0.44;
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dec = sane;
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frac = sane - dec;
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frac = (frac < 0) ? -frac : frac;
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/*
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* This will fail for numbers like -0.xyz (since there is no such thing
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* as -0. We manually add a minus sign in the printout if sane is neg
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* and dec is 0.
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* This is the wrong way to do it...
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*/
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putstring(" AccX=");
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if(sane < 0 && dec == 0) {
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putchar('-');
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}
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PRINTF("%d.%02ug (%d)\n", dec, (unsigned int)(frac * 100), rv);
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}
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rv = sensor->value(ADC_SENSOR_TYPE_ACC_Y);
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if(rv != -1) {
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sane = ((rv * 3.75 / 2047) - 1.65) / 0.44;
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dec = sane;
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frac = sane - dec;
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frac = (frac < 0) ? -frac : frac;
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putstring(" AccY=");
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if(sane < 0 && dec == 0) {
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putchar('-');
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}
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PRINTF("%d.%02ug (%d)\n", dec, (unsigned int)(frac * 100), rv);
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}
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rv = sensor->value(ADC_SENSOR_TYPE_ACC_Z);
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if(rv != -1) {
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sane = ((rv * 3.75 / 2047) - 1.65) / 0.44;
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dec = sane;
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frac = sane - dec;
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frac = (frac < 0) ? -frac : frac;
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putstring(" AccZ=");
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if(sane < 0 && dec == 0) {
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putchar('-');
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}
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PRINTF("%d.%02ug (%d)\n", dec, (unsigned int)(frac * 100), rv);
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}
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/*
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* Light: Vishay Semiconductors TEPT4400
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* Using 1.25V ref. voltage.
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* For 600 Lux illuminance, the sensor outputs 1mA current (0.9V ADC In)
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* 600 lux = 1mA output => 1473 ADC value at 12 bit resolution)
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*
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* Thus, at 12bit resolution:
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* 600 x 1.25 x ADC
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* Lux = ---------------- ~= ADC * 0.4071
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* 2047 x 0.9
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*/
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rv = sensor->value(ADC_SENSOR_TYPE_LIGHT);
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if(rv != -1) {
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sane = (float)(rv * 0.4071);
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dec = sane;
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frac = sane - dec;
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PRINTF(" Light=%d.%02ulux (%d)\n", dec, (unsigned int)(frac * 100),
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rv);
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}
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/*
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* Power Supply Voltage.
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* Using 1.25V ref. voltage.
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* AD Conversion on VDD/3
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*
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* Thus, at 12bit resolution:
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*
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* ADC x 1.25 x 3
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* Supply = -------------- V
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* 2047
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*/
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rv = sensor->value(ADC_SENSOR_TYPE_VDD);
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#if SEND_BATTERY_INFO
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sd.vdd = rv;
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#endif
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if(rv != -1) {
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sane = rv * 3.75 / 2047;
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dec = sane;
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frac = sane - dec;
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PRINTF("Supply=%d.%02uV (%d)\n", dec, (unsigned int)(frac * 100), rv);
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/* Store rv temporarily in dec so we can use it for the battery */
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dec = rv;
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}
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/*
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* Battery Voltage - Only 2/3 of the actual voltage reach the ADC input
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* Using 1.25V ref. voltage would result in 2047 AD conversions all the
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* time since ADC-in would be gt 1.25. We thus use AVDD_SOC as ref.
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*
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* Thus, at 12bit resolution (assuming VDD is 3.3V):
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*
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* ADC x 3.3 x 3 ADC x 4.95
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* Battery = ------------- = ---------- V
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* 2047 x 2 2047
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*
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* Replacing the 3.3V with an ADC reading of the actual VDD would yield
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* better accuracy. See monitor-node.c for an example.
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*
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* 3 x ADC x VDD x 3.75 ADC x VDD x 11.25
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* Battery = -------------------- = ----------------- V
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* 2 x 2047 x 2047 0x7FE002
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*
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*/
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rv = sensor->value(ADC_SENSOR_TYPE_BATTERY);
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if(rv != -1) {
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/* Instead of hard-coding 3.3 here, use the latest VDD (stored in dec)
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* (slightly inaccurate still, but better than crude 3.3) */
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sane = (11.25 * rv * dec) / (0x7FE002);
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dec = sane;
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frac = sane - dec;
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PRINTF(" Batt.=%d.%02uV (%d)\n", dec, (unsigned int)(frac * 100), rv);
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#if SEND_BATTERY_INFO
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sd.bat = rv;
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packetbuf_copyfrom(&sd, sizeof(sd));
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broadcast_send(&bc_con);
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#endif
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}
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leds_off(LEDS_RED);
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}
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etimer_reset(&et);
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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