How to add another relay

[Alexandre]

Hello,

Sorry for the question, I still do not understand much programming.

How to add more relay in the code below:

#define MY_REPEATER_FEATURE

#include <MySensors.h>

#define RELAY_PIN 4  // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
#define NUMBER_OF_RELAYS 1 // Total number of attached relays
#define RELAY_ON 1  // GPIO value to write to turn on attached relay
#define RELAY_OFF 0 // GPIO value to write to turn off attached relay


void before()
{
    for (int sensor=1, pin=RELAY_PIN; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
        // Then set relay pins in output mode
        pinMode(pin, OUTPUT);
        // Set relay to last known state (using eeprom storage)
        digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);
    }
}

void setup()
{

}

void presentation()
{
    // Send the sketch version information to the gateway and Controller
    sendSketchInfo("Relay", "1.0");

    for (int sensor=1, pin=RELAY_PIN; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
        // Register all sensors to gw (they will be created as child devices)
        present(sensor, S_BINARY);
    }
}


void loop()
{

}

void receive(const MyMessage &message)
{
    // We only expect one type of message from controller. But we better check anyway.
    if (message.type==V_STATUS) {
        // Change relay state
        digitalWrite(message.sensor-1+RELAY_PIN, message.getBool()?RELAY_ON:RELAY_OFF);
        // Store state in eeprom
        saveState(message.sensor, message.getBool());
        // Write some debug info
        Serial.print("Incoming change for sensor:");
        Serial.print(message.sensor);
        Serial.print(", New status: ");
        Serial.println(message.getBool());
    }
}

I'm using an ESP8266.

[skywatch]

@alexandre The code already supports more relays, so there is not much you need to do.

1. Change the line #define NUMBER_OF_RELAYS 1 to #define NUMBER_OF_RELAYS 2/3/4 etc. Until you run out of pins!

The rest of the code will automatically be handled within the 'for' loops.

[mfalkvidd]

A caveat with esp8266: gpio 6 is not exposed externally, so a maximum of 2 relays can be used (gpio 4 and 5).
Gpio 12, 13 and 14 can also be used but will require modification of the sketch.

[Alexandre]

Thank you very much.