Hey all - I am building a recording device using a raspberry pi.
I had everything working great, moved off a proto setup, to a soldered perf board, and now all the audio gets chopped.
Equipment is a Motorola CDM-1250, A Pi, C-media usb audio card.
I am using the PL detect, and CSQ detect from the acc plug on the back of the radio, as well as the RX audio pin, the Switched 12+, and ground.
Radio pinout is here - An Overview of the Motorola SM50/SM120 Mobile Radios
I am using pin 8 and 12 from the back of the radio, giving me 5v + while no matching signal is detected. They drop to 0 when a detection enables the output.
These pins, are passed through a logic level converter to drop to 3.3v, and input on the pi on pins 23 and 24.
Software watches, to see when CSQ is detected, and no PL tone is present. Starts recording, until CSQ is dropped, at which point it stops.
When I moved off of my jumper wire, slapped together mess, to a perf board, I now get chopped audio on the recording.
I have uploaded the 2 different files providing examples in a zip file.
I am sure I am missing something - it worked flawless previously. The only other thing I can think of, is I switched from using a 7805 regulator chip to provide the pi power, to this: Robot Check
I dont think thats causing it, as I have powered the pi from an external source and the problem was still there. (granted, that was a cheap 120v brick for cell phones... so who knows)
Any thoughts? This is proving to be quite frustrating!!
I had everything working great, moved off a proto setup, to a soldered perf board, and now all the audio gets chopped.
Equipment is a Motorola CDM-1250, A Pi, C-media usb audio card.
I am using the PL detect, and CSQ detect from the acc plug on the back of the radio, as well as the RX audio pin, the Switched 12+, and ground.
Radio pinout is here - An Overview of the Motorola SM50/SM120 Mobile Radios
I am using pin 8 and 12 from the back of the radio, giving me 5v + while no matching signal is detected. They drop to 0 when a detection enables the output.
These pins, are passed through a logic level converter to drop to 3.3v, and input on the pi on pins 23 and 24.
Software watches, to see when CSQ is detected, and no PL tone is present. Starts recording, until CSQ is dropped, at which point it stops.
When I moved off of my jumper wire, slapped together mess, to a perf board, I now get chopped audio on the recording.
I have uploaded the 2 different files providing examples in a zip file.
I am sure I am missing something - it worked flawless previously. The only other thing I can think of, is I switched from using a 7805 regulator chip to provide the pi power, to this: Robot Check
I dont think thats causing it, as I have powered the pi from an external source and the problem was still there. (granted, that was a cheap 120v brick for cell phones... so who knows)
Any thoughts? This is proving to be quite frustrating!!
