Arduino PLC Shield Schematic v0.10

May 24, 2010

I’ve managed to find some time this week to put together a draft schematic for the PLC shield.

I’ve only included 4x opto isolated inputs as I happened to have some TLP521 Quad Opto’s handy. I’ve added a couple of extra analog inputs as I may used a Seeedstudio v2.12 Arduino clone and that has an extra two analog pins so it makes sense to have them available and I’m still need to find a spare control signal to control the RX/TX enables for the RS485.

arduino_plc 0v10

An update can be found here:
Arduino PLC v0.20


Arduino PLC shield

April 28, 2010

I recently had a need for a simple digital controller something similar to a simple PLC (Programmable Logic Controller). I wanted to use the Arduino board I had but I couldn’t find any I/O shields that had the right mix of relay outputs (6) and opto-isolated inputs (6).

I know I could stack shields but the enclosure I had wouldn’t allow it. So I’ve put together a oversized (its a lot wider than your normal shield) Arduino PLC shield schematic which has 8x Relay channels and 6x Opto-Isolated channels and some analog inputs as well. The final number of relays and opto’s channels may change but I’ll post it and a PCB once it’s finished.

An update can be found here:
Arduino PLC v0.20