🧩 Waveshare MCP23017 IO Expansion Board - Expand 2 Signal Pins as 16 I/O Pins, Compatible with 3.3V and 5V Levels, I2C Interface Review

I needed many I/O ports for my Raspberry. I bought a total of seven of these. This board was very easy to use both for setting up the I/O ports. Interrupts are a nice feature, as is the ability to programmatically pull the input port high. No fuss Ruby examples. Pros: * Ease of use for I/O expansion. * Nice features (I/O configuration, pullups, interrupts) * Great code sample (C and Python). Cons: * Difficult to assemble as there is only one set of holes in the panel (ideally there would be a…

Modules are supplied in individual bags with finger protection in separate boxes. Very well protected. I've ordered them twice and both times the boxes were delivered the next day. Fast service, easy processing and protection! I used 4 MCP23017 modules to read 32 switches and control 32 LEDs with ESP32. Very easy to set up and use. The chips worked fine, driving the 3.3V ESP32 signal levels while I was running the MCP23017 from a 5V USB. Perfect, except the A1 address line didn't work on the…

Should be more breadboard friendly. The connector forces you to place the module at the end of the breadboard. This had to be installed on the other side so that all GPIO pins could be connected everywhere. To be honest the connector should be another 6 pin instead of the useless VCC/GND pins on the module. Then you can also attach the status display to the other side. Braided wires are very thin. I cut off the female end of the jumpers and used breadboard compatible screw terminals. Anyway, I…