seston

moisture with relays

Mar 28th, 2017
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  1. #include <SPI.h>
  2. #include <MySensor.h>
  3. #define MY_RADIO_NRF24
  4.  
  5. #define round(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))
  6. #define MY_DEBUG
  7. #define CHILD_ID_BATTERY 0
  8. #define SLEEP_TIME 600000 // Sleep time between reads (in milliseconds)
  9. #define STABILIZATION_TIME 500 // Let the sensor stabilize 0.5 seconds before reading
  10. #define BATTERY_FULL 3000 // 3,000 millivolts when battery is full (assuming 2xAA)
  11. #define BATTERY_ZERO 1700 // 1,700 millivolts when battery is empty (reqires blown brownout detection fuse, use 2,800 otherwise)
  12. // This sketch assumes power from 2xAA on Vcc (not RAW). Remove the power led and the voltage regulator for better battery life.
  13. // Sensors shall be connected to GND and their analog pin. Throw away the middle chip, just use the pitchfork.
  14. // Number of analog pins for each Arduino model can be seen at https://www.arduino.cc/en/Products/Compare
  15. // A5 and A6 on most Arduinos cannot be used because they don't have internal pullups
  16. const int SENSORS[] = {A0, A1, A2, A3, A4, A5}; // Remove the pins that you don't want to use
  17. #define N_ELEMENTS(array) (sizeof(array)/sizeof((array)[0]))
  18. long oldvoltage = 0;
  19.  
  20. #define RELAY_1 3 // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
  21. #define NUMBER_OF_RELAYS 1 // Total number of attached relays
  22. #define RELAY_ON 1 // GPIO value to write to turn on attached relay
  23. #define RELAY_OFF 0 // GPIO value to write to turn off attached relay
  24.  
  25.  
  26. MySensor gw;
  27. MyMessage moisture_messages[N_ELEMENTS(SENSORS)];
  28. MyMessage voltage_msg(CHILD_ID_BATTERY, V_VOLTAGE);
  29.  
  30. void before()
  31. {
  32. for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
  33. // Then set relay pins in output mode
  34. pinMode(pin, OUTPUT);
  35.  
  36. }
  37. }
  38.  
  39.  
  40. void setup()
  41. {
  42. gw.begin();
  43. gw.sendSketchInfo("Plants moisture w bat", "1.2");
  44. gw.present(CHILD_ID_BATTERY, S_CUSTOM);
  45. gw.sendSketchInfo("Relay", "1.0");
  46.  
  47. for (int sensor = 0; sensor < N_ELEMENTS(SENSORS); sensor++) {
  48. moisture_messages[sensor].sensor = sensor + 1; // Battery uses child ID 0 so sensors start at 1
  49. moisture_messages[sensor].type = V_HUM;
  50. delay(250);
  51. gw.present(sensor + 1, S_HUM);
  52. }
  53. for (int i = 0; i < N_ELEMENTS(SENSORS); i++) {
  54. pinMode(SENSORS[i], OUTPUT);
  55. digitalWrite(SENSORS[i], LOW);
  56. }
  57.  
  58. for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
  59.  
  60. }
  61. }
  62.  
  63. void receive(const MyMessage &message)
  64. {
  65. // We only expect one type of message from controller. But we better check anyway.
  66. if (message.type==V_STATUS) {
  67. // Change relay state
  68. digitalWrite(message.sensor-1+RELAY_1, message.getBool()?RELAY_ON:RELAY_OFF);
  69. // Store state in eeprom
  70. saveState(message.sensor, message.getBool());
  71. // Write some debug info
  72. Serial.print("Incoming change for sensor:");
  73. Serial.print(message.sensor);
  74. Serial.print(", New status: ");
  75. Serial.println(message.getBool());
  76. }
  77.  
  78. void loop()
  79. {
  80. for (int sensor = 0; sensor < N_ELEMENTS(SENSORS); sensor++) {
  81. pinMode(SENSORS[sensor], INPUT_PULLUP); // "Power on" the sensor and activate the internal pullup resistor
  82. analogRead(SENSORS[sensor]); // Read once to let the ADC capacitor start charging
  83. gw.sleep(STABILIZATION_TIME);
  84. int moistureLevel = (1023 - analogRead(SENSORS[sensor])) / 10.23;
  85.  
  86. // Turn off the sensor to conserve battery and minimize corrosion
  87. pinMode(SENSORS[sensor], OUTPUT);
  88. digitalWrite(SENSORS[sensor], LOW);
  89.  
  90. gw.send(moisture_messages[sensor].set(moistureLevel));
  91. }
  92.  
  93. long voltage = readVcc();
  94. if (oldvoltage != voltage) { // Only send battery information if voltage has changed, to conserve battery.
  95. gw.send(voltage_msg.set(voltage / 1000.0, 3)); // redVcc returns millivolts and set wants volts and how many decimals (3 in our case)
  96. gw.sendBatteryLevel(round((voltage - BATTERY_ZERO) * 100.0 / (BATTERY_FULL - BATTERY_ZERO)));
  97. oldvoltage = voltage;
  98. }
  99. gw.sleep(SLEEP_TIME);
  100. }
  101.  
  102. long readVcc()
  103. {
  104. // From http://provideyourown.com/2012/secret-arduino-voltmeter-measure-battery-voltage/
  105. // Read 1.1V reference against AVcc
  106. // set the reference to Vcc and the measurement to the internal 1.1V reference
  107. #if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
  108. ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
  109. #elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
  110. ADMUX = _BV(MUX5) | _BV(MUX0);
  111. #elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
  112. ADMUX = _BV(MUX3) | _BV(MUX2);
  113. #else
  114. ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
  115. #endif
  116.  
  117. delay(2); // Wait for Vref to settle
  118. ADCSRA |= _BV(ADSC); // Start conversion
  119. while (bit_is_set(ADCSRA, ADSC)); // measuring
  120.  
  121. uint8_t low = ADCL; // must read ADCL first - it then locks ADCH
  122. uint8_t high = ADCH; // unlocks both
  123.  
  124. long result = (high << 8) | low;
  125.  
  126. result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
  127. return result; // Vcc in millivolts
  128. }
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