common-Using the Relay Switch

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Using the Onboard Relay Switch


You can use the onboard relay switch of APM 1 to control on/off devices that consumer more current than can be supplied by simply turning a digital pin on and off.

The way the relay works is that it switches between connecting a common center pin to one of the two outer pins (State 1 or State 2). So if, for example, you wanted to trigger a solonoid, you’d connect the solonoid’s V+ pin to the center pin, and connect State 1 to APM’s V+ and State 2 to Ground. In State 1, the solonoid would go on; in State 2 it would go off.

You script it into missions with any GCS. Here are the commands in the Mission Planner:

Here’s some code that demonstrates it switching from one position to another.

pinMode(RELAY_PIN,OUTPUT);

	while(1)
		delay(3000);

		Serial.println("Relay Position A");
		PORTL |= B00000100;
		delay(3000);

		Serial.println("Relay Position B");
		PORTL ^= B00000100;

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