![]() Note: The input board can be used with older versions of the IO Pi Plus and IO Pi Zero, as well as the original IO Pi, but you will need to only connect the 16 input pins on the IDC connector. The design and Gerber files for the input board are available to download from our GitHub repository. The schematic and PCB files are included in Diptrace format you can download a free version of Diptrace from. The “Gerber Files.zip” file contains a zip of the Gerber files that can be uploaded directly to the PCB manufacturer of your choice. Gerber files are included in the GitHub repository and use a file name format compatible with several PCB manufacturers, including JLC PCB and Elecrow. For example, a 560R resistor will give a usable input voltage range of 3V to 12V. Our LED resistor calculator can be used to find the required resistance. The emitter for the FOD817C300 opto-isolator requires a maximum current of 20mA at 1.2V. The input resistors R1 to R16 will need to be specified for the input voltage. The input numbers match the pin numbering on the IO Pi Plus bus making it easy to read the inputs using our IO Pi software libraries. The 20-pin IDC connector uses the same pin configuration as the IO Pi Plus 2.1, so you can connect the two using two 20-pin IDC connectors and a ribbon cable. 16 x 2 pin 5.08mm screw terminals or another compatible connector.1 x 20 pin IDC PCB connector (2.54mm pitch).R1 to R16: 0.25W Resistor (see below for calculating values). ![]() VO1 to VO16: 16 x FOD817C300 optoisolator.To build the relay board, you will need the following parts: The board is designed to work with the FOD817C300 opto-isolator from Fairchild Semiconductor, but it should work with any 4-pin transistor optoisolator that uses the same pin configuration. The 16-channel opto-isolated input board is suitable for the IO Pi Plus version 2.1 or later and the IO Pi Zero. ![]() We are releasing the design files for an opto-isolated input board to go with the relay board. We made the design and Gerber files public, so anyone can make their own or modify the design to fit their needs. In 2017 we released the design files for a relay board to work with our IO Pi Plus interface board.
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