Moderator: leecollings
No, I do not have a gas meter. However, if you have a modern gas meter, you should take a pulse count sketch from MySensors. This would be your starting point.macieiks wrote:I will use big powerbanks. Right now I just need to obtain sketch for GasMeter. Do you have any test one?
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/* Gas pulse count - low power
Gas (kWh) - take the number of gas units used (nb meter readings ignore last 2 dials so 100 pulses)
For imperial meter:
X by 2.83
X by calorific value for the period
gasCalVal for Aug-Dec 2013 = 38.88
X correction factor (1.022640)
Divide by 3.6.
100 pulses = (2.83 * 38.88 * 1.022640) / 3.6 = 31 KWh
0.31 pulses = 1KWh
Pulses per watt hour = 0.31/1000 = 0.00031
*/
#include <avr/power.h>
#include <avr/sleep.h>
#include <JeeLib.h>
#include <avr/wdt.h>
ISR(WDT_vect) { Sleepy::watchdogEvent(); }
#define frequency RF12_433MHZ // RF12_433MHZ, RF12_868MHZ or RF12_915MHZ
#define node 7 // RFM12B node ID - gas is on 7 - 4 for testing
#define group 210 // RFM12B wireless network group 210 usual (212 weather)
const int UNO = 1; // Set to 0 if your not using the UNO bootloader (i.e using Duemilanove) - All Atmega's shipped from OpenEnergyMonitor come with Arduino Uno bootloader
typedef struct {
int16_t power;
int16_t pulse;
int16_t battery;
} PayloadTX;
PayloadTX rf_data;
// Set up bits
const byte LEDpin = 9;
const byte debug = 0; // set to 1 for debug info
const long time_between_readings = 100000; // 100K is about 120secs in low-power mode
// Pulse counting settings
long pulseCount = 0; // Number of pulses, used to measure energy.
unsigned long pulseTime; // Current pulse time
unsigned long lastTime; // Last pulse time
double elapsedWh;
double power;
const double ppwh = 0.00031;
void setup()
{
Serial.begin(9600);
if (debug ==1)
{
Serial.println("Gas pulse imperial meter - 1 cubic foot per pulse");
}
delay(100);
rf12_initialize(node, frequency, group); // initialize RF
rf12_sleep(RF12_SLEEP);
pinMode(LEDpin, OUTPUT); // Setup indicator LED
//digitalWrite(LEDpin, HIGH);
//digitalWrite(3, HIGH); // Set pull up resistor on
attachInterrupt(1, onPulse, FALLING); // IRQ 1 = D3
flashLED(50);
delay(100);
flashLED(50);
power_twi_disable();
power_adc_disable();
//power_spi_disable();
}
unsigned long last_rf;
//Main Program Loop.
void loop()
{
unsigned long time_since_last_rf = millis()-last_rf;
if (debug ==1)
{
Serial.print("Time since last TX "); Serial.println(time_since_last_rf); Serial.println();
delay(50);
}
if (time_since_last_rf >= time_between_readings) // If equal or greater than time between readings since the last tx then send the current values over RF.
{
rf_data.pulse = pulseCount; pulseCount=0;
rf_data.battery = readVcc();
send_rf_data(); // SEND RF DATA
last_rf = millis();
time_since_last_rf = 0;
if (debug == 1)
{
Serial.println("Data just sent was:");
Serial.print("Power: "); Serial.print(rf_data.power); Serial.println("W");
Serial.print("Number of pulses: "); Serial.println(rf_data.pulse);
Serial.print("Battery: "); Serial.print(rf_data.battery); Serial.println("mV");
Serial.println();
flashLED(10);
}
}
unsigned long backtosleep = (time_between_readings-time_since_last_rf); // Calculate the time the MCU needs to go back to sleep for
if (debug == 1)
{
Serial.print("Going to sleep for "); Serial.println(backtosleep);
delay(50);
}
Sleepy::loseSomeTime(backtosleep); // Put the MCU into low power mode.
}
// The interrupt routine - runs each time a falling edge of a pulse is detected
void onPulse()
{
lastTime = pulseTime; // Time between pulses.
pulseTime = micros();
pulseCount++; // Pulse counter
rf_data.power = double((3600000000 / (pulseTime - lastTime))/ppwh); // Calculate power electricity
}
// Calculate MCU Voltage (mV).
long readVcc() {
power_adc_enable();
long result;
ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
delay(2);
ADCSRA |= _BV(ADSC);
while (bit_is_set(ADCSRA,ADSC));
result = ADCL;
result |= ADCH<<8;
result = 1126400L / result;
power_adc_disable();
return result;
}
void send_rf_data()
{
//power_spi_enable();
rf12_sleep(RF12_WAKEUP);
rf12_sendNow(0, &rf_data, sizeof rf_data); //send gas data via RFM12B using new rf12_sendNow wrapper
rf12_sendWait(2);
rf12_sleep(RF12_SLEEP);
//power_spi_disable();
}
void emontx_sleep(int seconds) {
for (int i=0; i<seconds; i++) {
delay(1000);
if (UNO) wdt_reset();
}
}
// LED flash
void flashLED(int msec)
{
digitalWrite(LEDpin, HIGH);
delay(msec);
digitalWrite(LEDpin, LOW);
}
Right now I am testing it on my desk but I will try this weekend to attach magnet sensor to my gas meter Users browsing this forum: No registered users and 1 guest