It's not the sensors giving me the problem. I don't know what is. Probably wiring.
Following this discussion
https://forums.adafruit.com/viewtopic.p ... 4#p1056494
I have a power source (either battery or p/s wall wart) connected to a mpm3610 voltage step down converter to 3.3 V.
I had hoped this would be stable enough. The 3.3V from the mpm3610 goes to the V+ rail on the top of the breadboard.
The V+ rail powers the sensors. Also a diode is connected from V+ rail to Vsys on the pico.
Power on the usb cable to the pico is disconnected; just has data;
Would it be better to swap a few wires so the sensors were all powered by the 3.3V output of the raspberry pi ?
I figure I don't know but maybe the logic levels of the pico are more like its input 3.3V minus the diode voltage drop
whereas the logic levels of the sensors are more based on the 3.3V rail. Could that cause instability ?
Also I have a long 2 conductor wire going from a GPIO pin on the raspberry pi "server" to the pico with one black ground wire and one red wire attached to the pico's run pin. The run pin has a 4.7k pull up. Maybe this is randomly rebooting the pico
Following this discussion
https://forums.adafruit.com/viewtopic.p ... 4#p1056494
I have a power source (either battery or p/s wall wart) connected to a mpm3610 voltage step down converter to 3.3 V.
I had hoped this would be stable enough. The 3.3V from the mpm3610 goes to the V+ rail on the top of the breadboard.
The V+ rail powers the sensors. Also a diode is connected from V+ rail to Vsys on the pico.
Power on the usb cable to the pico is disconnected; just has data;
Would it be better to swap a few wires so the sensors were all powered by the 3.3V output of the raspberry pi ?
I figure I don't know but maybe the logic levels of the pico are more like its input 3.3V minus the diode voltage drop
whereas the logic levels of the sensors are more based on the 3.3V rail. Could that cause instability ?
Also I have a long 2 conductor wire going from a GPIO pin on the raspberry pi "server" to the pico with one black ground wire and one red wire attached to the pico's run pin. The run pin has a 4.7k pull up. Maybe this is randomly rebooting the pico
Statistics: Posted by garberw — Thu May 29, 2025 11:40 pm