Exception error with MCP23017 and BlynkTimer

[PeteKnight]

I’ve moved this post to its own topic.

This appears to be intended to be used with the old version of Blynk. If that is the case then you need to be using Blynk library version 0.6.1

also, have you seen this topic…

Using the MCP23017 IO Expansion Board

EDIT NOVEMBER 2021… Anyone interested in controlling multiple relays may also want to take a look at this topic, which uses a pre-built 16-way relay board and 2x 74hc595 shift registers: END OF EDIT . I had a project recently where I wanted to use 5 physical buttons, with built-in LED indicators, to control 5 relays. That meant having 15 GPIOs available, so I built the project around an ESP32 dev board. I also needed a few more GPIO pins for other sensors, so by the time I was done I was o…

Pete.