Though I couldn't see why it would cause an issue, I really thought that level translation/"SPI or I2C" thing might be on to something. But then you got the two of them to work on a breadboard.
I'll just throw this out there: could it be as simple as a short between your two CS pins? They are on adjacent header pins.
Failing that, can you test a Rev 2 in the breadboard setup? If that works, that points to a PCB/wiring problem in the original. If it doesn't... what's different in SPI between the original and the Rev 2???
No short unfortunately haha. I plugged the rev2 into the setup and it worked fine so its got to be the PCB... Do you mind taking a quick looks at the schematic?
Vin - this is the power pin. Since the sensor chip uses 3 VDC, we have included a voltage regulator on board that will take 3-5VDC and safely convert it down. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V microcontroller like Arduino, use 5V
(and you may have a similar issue with the display being powered by 5V)
(and your button header is inputting 5V - is the Nano 33 BLE 5V tolerant?)
(and you're using an NPN transistor as a high side switch)
Got it thank you van! I was going to reprint this PCB anyway so thank you for the additional tips! Once I get it I will test and reply to this thread to let you know whether it worked or not.
Hey van_der_decken,
I redesigned the PCB with 3v for all devices and I am running into the same issue... I am kinda running out of ideas on what could be causing the problem here. I tested the components before PCB, I tested them individually on the PCB and they work great, but as soon as I plug in both, neither can initialize.
