Hardware
See wiki for optional modifications
The ESP32 can be powered directly from the 5V rail of the Jura Ena Micro 90, but of course this means that when the machine is off so is the bridge. Separate power is also possible, but know that in this case, the ESP32 will continue to power the input board; some sensors will be readable even after the machine is "off" such as temperature sensors. Running the machine in this manner does not appear to cause damage, but whether or not this operational mode causes damage is unknown. Recommended to power the jurabridge from the machine itself.
Additionally, a pushbutton should be connected to some interrupt pin. In this project, a pushbutton (not shown below) is connected between 21 and GND. I also added a debouncing cap, but in many cases this is optional.
Connect hardware UART pins to LV pins of the converter board. Corresponding HV pins should be connected to appropriate Tx and Rx pins of the jura debug port:
@AussieMakerGeek has an annotated pinout here, reproduced (cropped & rotated) below:
Simple pushbutton for menu interface (not required, but neat). I also used a small cap for debounce, but do whatever you like:
