The Raspberry Pi 4 was recently released. This post is about our boards and their compatibility with the Raspberry Pi 4. Are our extension boards like the PowerBlock or the ControlBlock compatible with it? The short answer is “yes, with an additional 10K (pull-down) resistor that you can easily add”.
We would have loved it if we could tell you that our current revisions of the boards work without any additional tinkering with the Raspberry Pi 4. However, we realised that the early initialisation behaviour of the RPi 4 is slightly different in comparison to the previous Raspberries. As a result of that the power-switch functionality of our PowerBlock and ControlBlock boards runs into an endless loop without ever turning on the Raspberry.
But you can easily correct this: You simply need to put a pull-down resistor between the 11th pin and a ground pin. We suggest to use a 10K through-hole resistor for that. With that the boards are fully working.
The following images illustrate which pins needs you need to connect and how you could use a 10K through-hole resistor for that. The images show the ControlBlock and the PowerBlock:
Future revisions of our boards will of course take this into account.
We set up this compatibility page that summarises these information for all products also in the future.
Good luck with your projects!