[jbm417]

I have looked at the board layout & schematic, but cannot figure out if it is possible to use Arduino D4 to control Relay 1. Will someone help me with a simple answer?

TIA, Joe

[Leff]

Hi Joe,

Welcome!

It's easy to make it just by removing the pin-map on the board and then connect the pin to the any Digital pin, e.g. D4.

For example:

I removed the map on D2/IO3, and connect it by a wire to D3;

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If I upload the sketch:

Code: Select all

void setup() {
  // initialize digital pin 13 as an output.
  pinMode(3, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(3, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);              // wait for a second
  digitalWrite(3, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);              // wait for a second
}

It goes like this:

2015_08_28_13_46_01.gif

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[jbm417]

Leff, thank you for the info. This is just what I needed.

[Leff]

Leff, thank you for the info. This is just what I needed.

Very happy that could help you!