Plug-on relay driver anywhere?

[Bosse_B]

I would like to connect a couple of relays to the Pi2 (GPIO connect) but to do so requires a driver circuit.
So I wonder if there is such a thing ready-made so I don't have to make a board all by myself for this project. I have tried finding something at Adafruit but I couldn't. Possibly by lack of search experience...

A simple board with some interface circuitry and an output buffer sufficient to pull an external relay is what I need.
Any ideas?

[BMS Doug]

I would like to connect a couple of relays to the Pi2 (GPIO connect) but to do so requires a driver circuit.
So I wonder if there is such a thing ready-made so I don't have to make a board all by myself for this project. I have tried finding something at Adafruit but I couldn't. Possibly by lack of search experience...

A simple board with some interface circuitry and an output buffer sufficient to pull an external relay is what I need.
Any ideas?

There are a wide variety of 5v relay boards available, these could be used to operate a larger, external, relay.

Look for one with opto-isolated inputs, be aware that there can be issues with the setup.

[Bosse_B]

Is it possible to access the GPIO using Free Pascal?
What I find using Google always seem to refer to the original Pi with a different connector and also require root....

[Bosse_B]

I found that I can toggle GPIO pins from my Free Pascal program (see this thread).
But I could not find any simple ready-made plug-on accessory that implements a relay output.
So I will build a board myself with the needed components.
Done.

[ame]

There's this one:
http://www.dx.com/p/2-channel-relay-mod ... hm1Y-qsLqA

It might work. Looks like it just uses a transistor buffer.

There's this one:
http://www.dx.com/p/diy-5v-2-ch-relay-m ... hm2M-qsLqA

I have one similar. It uses a poorly designed optoisolator interface. I shorted out the indicator LEDs and it works fine.

There are many modules like this from China on eBay, Amazon, aliexpress and so on. Much easier than building your own.

[Bosse_B]

I bought a 4-relay board designed for Arduino. Does not matter because it operates on 5VDC and GPIO control bits via an opto coupler in each channel.
Works just fine.