How do you hook up a 4 channel relay to a Raspberry Pi?

Connecting the Relay

  1. Connect the 5V Pi pin to the Vcc pin of the relay board.
  2. Connect the Ground Pin of the Pi to the Ground pin of the relay board.
  3. Connect GPIO pin 22 to the input of the transistor circuit above and the output to IN1 pin of the relay board.

Can a Raspberry Pi drive a relay?

For this purpose, relays can be used on the Raspberry Pi: The relay “switch” is utilized by means of a low-voltage pulse. Since the Pi only tolerates a maximum of 5V (the GPIOs even only 3.3V) without relays, there is the risk that the Pi could burn out. However, if you have two separate circuits this can not happen.

How many relays can a Raspberry Pi control?

Like the Mega-IO, the boards are stackable, so you can stack up to 8x boards for a total of 64 relays per Raspberry Pi.

Can I use 5V relay with Raspberry Pi?

A separate 5V relay supply is required (connected to JD-VCC, Gnd). This should be totally isolated from the Pi. The Pi 5V power pins could be used, but this negates any opto-isolation. This results in operation as normal, minimises GPIO current and can be used with multiple relays, but external circuitry is required.

Is 3.3 V enough for relay?

For communications, it may sometimes work to use 3.3V since it could be registered as a logical high, but you better not rely on it, for any serious applications. You can choose a relay that can work with low voltage/low current.

How do you use a Raspberry Pi relay?

Connecting the relay

  1. Take two jumper wires and connect one of them to the GPIO 24 (Pin18) on the Pi and the other one to the GND Pin.
  2. Now connect the other ends of the wire to the relay board.
  3. Now connect the power supply to the relay, either using 12V power adapter or by connecting the VCC Pin to 3.3V or 5V on the Pi.

Can I use a 5V relay work on 3.3 V?

The relay will draw too much current. For connecting a low current data-connection, it can actually work since the 3.3V might be seen as a logic HIGH.

Can you run a 5V relay on 3.3 V?

Most likely the 3.3v pin cannot provide sufficient power (even stepped up to 5V) to activate a relay.