Created
April 7, 2014 08:07
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Arduino sketch for duinode reporting voltage and temperature
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#include <SPI.h> | |
#include <avr/sleep.h> | |
#include "nRF24L01.h" | |
#include "RF24.h" | |
#include "printf.h" | |
RF24 radio(8, 7); | |
int led = 3; | |
int temp = A2; | |
int voltage = A3; | |
int node_id = 1; | |
uint64_t addresses[3] = { 0xF0F0F0F0D2LL, 0xF0F0F0F0E1LL, 0xF0F0F0F0A2LL }; | |
const short sleep_cycles_per_transmission = 35; | |
volatile short sleep_cycles_remaining = sleep_cycles_per_transmission; | |
float readMCP9700(const int pin) | |
{ | |
// http://ww1.microchip.com/downloads/en/AppNotes/01001a.pdf | |
int v = analogRead(pin); | |
float t = ( (v * 1.1 / 1024.0 ) - 0.5 ) * 100; | |
float t_e = 244e-6 * (125.0 - t) * (t - -40.0) + 2e-12 * (t - -40.0) - 2.0; | |
return t - t_e; | |
} | |
float readBatteryVoltage(const int pin) | |
{ | |
int v = analogRead(pin); | |
return (v * 3.3 / 1024.0); | |
} | |
void setup_watchdog(uint8_t prescalar) | |
{ | |
prescalar = min(9,prescalar); | |
uint8_t wdtcsr = prescalar & 7; | |
if ( prescalar & 8 ) | |
wdtcsr |= _BV(WDP3); | |
MCUSR &= ~_BV(WDRF); | |
WDTCSR = _BV(WDCE) | _BV(WDE); | |
WDTCSR = _BV(WDCE) | wdtcsr | _BV(WDIE); | |
} | |
ISR(WDT_vect) | |
{ | |
--sleep_cycles_remaining; | |
} | |
void do_sleep(void) | |
{ | |
set_sleep_mode(SLEEP_MODE_PWR_DOWN); | |
sleep_enable(); | |
sleep_mode(); | |
sleep_disable(); | |
} | |
void setup() { | |
analogReference(INTERNAL); | |
Serial.begin(57600); | |
radio.begin(); | |
radio.setRetries(15, 15); | |
radio.setPALevel(RF24_PA_MAX); | |
radio.setDataRate(RF24_1MBPS); | |
radio.setChannel(76); | |
radio.setPayloadSize(32); | |
radio.openWritingPipe(addresses[node_id]); | |
setup_watchdog(9); | |
} | |
void loop() { | |
double v, t; | |
char buf[32]; | |
radio.powerUp(); | |
v = readBatteryVoltage(voltage); | |
t = readMCP9700(temp); | |
snprintf(buf, 32, "N=%d;V=%d;T=%d", node_id, (int) (v * 100), (int) (t * 100)); | |
Serial.println(buf); | |
radio.write(buf, 32); | |
radio.powerDown(); | |
while (sleep_cycles_remaining) { | |
do_sleep(); | |
} | |
sleep_cycles_remaining = sleep_cycles_per_transmission; | |
} |
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