Hello,

I have an Arduino device where I need to monitor status of 32 pins for reed sensors. To make things easier, I put everything in for loop as much as I can, but I'm running into some roadblocks and I could use a little help.

I started off with this example (https://github.com/mysensors/MySensorsArduinoExamples/blob/master/examples/BinarySwitchSensor/BinarySwitchSensor.ino) and examples from forums on this site (https://forum.mysensors.org/topic/264/help-with-arrays-and-debouncing). Second one was good for helping me simplify, but still would be too cluttered for 32 pins. I tried my modifications seen below:

#define MY_DEBUG
#define MY_GATEWAY_SERIAL
#define MY_BAUD_RATE 9600
#include <MySensors.h>
#include <Bounce2.h>

Bounce debouncer[32];
int oldValue[32];
MyMessage msg[32];

void setup() {
  for (byte i = 22; i <= 54; i++) {
    debouncer[i] = Bounce();
    oldValue[i] = -1;
  }
  for (byte i = 22; i <= 54; i++) {
    pinMode(i, INPUT);
    digitalWrite(i, HIGH);
    debouncer[i].attach(i);
    debouncer[i].interval(5);
  }
}

void presentation() {
  for (byte i = 22; i <= 54; i++) {
    present(i, S_DOOR);
  }
}

void loop() {
  for (byte i = 22; i <= 54; i++) {
    debouncer[i].update();
    int value = debouncer[i].read();
    if (value != oldValue[i]) {
      send(msg[i].set(value == HIGH ? 1 : 0));
      oldValue[i] = value;
    }
  }
}

I understand that since MyMessage objects are created at definition, I can't use "msg (i, V_TRIPPED)" in setup(). I can't seem to use constructor methods from MyMessage.cpp properly either. I tried code below in setup() but that threw error message 'unresolved overloaded function type' for both lines.

msg[i].setSensor[i];
msg[i].setType[V_TRIPPED];

Is there a better way to set up 32 instances of the message object with a for loop? I plan to add more sensors of different types once I get these working, so I would like to keep this in a for loop to make it maintainable.

Thank you.

I finally got it working reading through google searches. I'd like to provide how I did it for anyone that may run into a similar issue in the future. While looking for this solution, I saw at least one person who had the exact same issue and their problem went unresolved.

Raspberry Pi 3 is connected to Arduino Mega through regular serial link. Raspberry pi uses uart pins that map to Serial0 in raspbian. On Arduino Mega I use Serial2 pins (16,17). There's a voltage divider circuit between the two that reduces 5v to 3.3 for the pi.

I compiled my gateway on pi with below:

./configure --my-transport=rs485 --my-rs485-serial-port=/dev/serial0 --my-rs485-baudrate=9600

On Arduino I have these define lines:

#define MY_DEBUG
#define MY_DEBUGDEVICE Serial
#define MY_RS485
#define MY_RS485_HWSERIAL Serial2
#define MY_NODE_ID 1
#define MY_RS485_BAUD_RATE 9600
#define MY_RS485_DE_PIN -1

I'm not an expert on this by any means, but out of everything I tried, this is what worked for me. There are still some remaining issues:

• Possibly due to line noise or voltage being low on Arduino, I've had one crash that made Arduino print gibberish on serial and it stopped transmitting anything at all.
• I use Home Assistant and it seems to give up on MySensors if it doesn't receive anything in a while. Requires restart of HA core. Not very reliable.

I still welcome any insight into this process and any alternatives/recommendations. I'd like to make this as reliable as possible, but my knowledge of these systems and electronics is limited.