Hello everyone,
I am currently trying to clock a pico 2 board with a 10 MHz pulse reference from a Rigol DG1022Z function generator. The firmware that I require for my project specifies the external clock input as GPIO 20 pin. I have the pico on a breakout board with leds to show when a signal is being received by the pins. In the past, the led for this pin has lit up, but it is failing to do so now. It seems that this problem is specific to this pin only.
For reference, my setup is as follows:
I connect the function generator output to the GPIO 20 pin via a BNC pigtail cable.
I know that the signal is being generated, since I am able to produce the waveform on the scope on both rigol output channels.
I have tried multiple different cables, different ground connections, and adjusting the lengths of the signal and ground conductor leads on the BNC pigtail cable, and as a final sanity check, did this procedure for both channels on the function generator. The led still does not light up, which leads me to believe the signal is not being received by the pico. I used a multimeter to verify the the circuit is complete between the pins on the pico and my wire leads for the signal and ground conductor
Does anyone have any recommendations as to how to further troubleshoot this, or a possible solution?
Thank you!
Alexander
I am currently trying to clock a pico 2 board with a 10 MHz pulse reference from a Rigol DG1022Z function generator. The firmware that I require for my project specifies the external clock input as GPIO 20 pin. I have the pico on a breakout board with leds to show when a signal is being received by the pins. In the past, the led for this pin has lit up, but it is failing to do so now. It seems that this problem is specific to this pin only.
For reference, my setup is as follows:
I connect the function generator output to the GPIO 20 pin via a BNC pigtail cable.
I know that the signal is being generated, since I am able to produce the waveform on the scope on both rigol output channels.
I have tried multiple different cables, different ground connections, and adjusting the lengths of the signal and ground conductor leads on the BNC pigtail cable, and as a final sanity check, did this procedure for both channels on the function generator. The led still does not light up, which leads me to believe the signal is not being received by the pico. I used a multimeter to verify the the circuit is complete between the pins on the pico and my wire leads for the signal and ground conductor
Does anyone have any recommendations as to how to further troubleshoot this, or a possible solution?
Thank you!
Alexander
Statistics: Posted by amikheyenko — Wed Feb 11, 2026 6:23 pm — Replies 3 — Views 83