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Misc RPi4B & CM108 Questions

 

Still working on my Allstar node using a RPi4B, CM108 audio fob and BF-888S. Assume I'm running HamVoip. I have a couple more questions for the group.

1) Does CM108 Pin 48 (VOLDN) require an active low or high from the Baofeng COS? I measure a 0V to 2.4V transition when the Baofeng receives, which implies a normally LOW condition at Pin 48 with a HIGH signal when COS is active.
2) Does CM108 pin 13 (GPIO3) go HIGH when audio ready to go to the Baofeng PTT?
3) Most mod approaches seem to tap the Baofeng received audio from the top of the volume pot and then feed the CM108 Pin 27 (MICIN) through a 10K resistor or a pot. Why not just use the volume control wiper output to feed CM108 Pin 27 and have a variable input to Pin 27?
4) Does HamVoip provide for gracefull shutdown using a SPST switch? How about the RPi4B while not runninh HamVoip - is there a simple way to shut it down without changing any software?
5) Can I run HamVoip on the Pi without an Audio fob or radio to test the HamVoip operation? It seems like I should be able to.

Thanks.

Scott Eckert/KK6DZ

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Hello Scott,

Many of your questions are Allstar centric.? Why wouldn't you post this on the HamVoIP list?

For a graceful shutdown button, I do believe that Raspberry Pi image includes one.? See the HamVoIP documentation.? If not, it's easy to add one.?? Finally, I think you can run HamVoIP a receive only device using the onboard audio out only sound jack but it might take some minor configuration changes to make that work.?

--David
KI6ZHD


On 07/22/2023 08:33 AM, Scott Eckert via groups.io wrote:

Still working on my Allstar node using a RPi4B, CM108 audio fob and BF-888S. Assume I'm running HamVoip. I have a couple more questions for the group.

1) Does CM108 Pin 48 (VOLDN) require an active low or high from the Baofeng COS? I measure a 0V to 2.4V transition when the Baofeng receives, which implies a normally LOW condition at Pin 48 with a HIGH signal when COS is active.
2) Does CM108 pin 13 (GPIO3) go HIGH when audio ready to go to the Baofeng PTT?
3) Most mod approaches seem to tap the Baofeng received audio from the top of the volume pot and then feed the CM108 Pin 27 (MICIN) through a 10K resistor or a pot. Why not just use the volume control wiper output to feed CM108 Pin 27 and have a variable input to Pin 27?
4) Does HamVoip provide for gracefull shutdown using a SPST switch? How about the RPi4B while not runninh HamVoip - is there a simple way to shut it down without changing any software?
5) Can I run HamVoip on the Pi without an Audio fob or radio to test the HamVoip operation? It seems like I should be able to.

Thanks.

Scott Eckert/KK6DZ

?

 

Thanks David. I will post there. Scott

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