UPDATED: HS_Dual_hat locks up Pi Zero when screen is connected

MMDVM_HS Hat hardware
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k9amt
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Joined: Sun Jan 19, 2020 7:38 pm

UPDATED: HS_Dual_hat locks up Pi Zero when screen is connected

Post by k9amt »

Updated to the actual issues:

MMDVM_HS_Dual v1.3 connected to a PI-Zero. It's a china mmdvm dual hat pi-zero combo with a 3.2 inch Nextion screen. I can connect and configure the pi just fine, standalone. As soon as the Nextion screen is to MMDVM is connected the pi locks up and can't ping via IP and I can't access anything via the dashboard.

The MMDVM goes the a cycle of slow flashing red then all on board LED flash 3 times. Nextion sceen displays MMDVM logo at the top.

WITHOUT the screen connected everything work as it should and a successful firmware update of the MMDVM was done.

The screen is active and display the basic MMDVM head at the top on a white background.
Last edited by k9amt on Thu Dec 03, 2020 12:21 am, edited 1 time in total.
KE7FNS
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Re: UPDATED: HS_Dual_hat locks up Pi Zero when screen is connected

Post by KE7FNS »

k9amt wrote: Wed Dec 02, 2020 9:36 pm The MMDVM goes the a cycle of slow flashing red then all on board LED flash 3 times. Nextion sceen displays MMDVM logo at the top.
The red SRV (service) LED flashes slowly until the MMDVM connects with MMDVMHost and then it flashes at a faster rate once a serial connection is established.

When all the LED's flash 3 times, the board has initialized from a reset, so that leads me to suspect you've connected something incorrectly. I'm not sure if a incorrect serial port configuration will cause a forced reset, but maybe???? shrug. If you are using the Nextion port on the hat, you should be configuring the nextion port to 'modem' and NOT '/dev/ttyAMA0'

It could be your board is just a faulty one, I mean thats sort of what you should expect from a cheaply made chinese clone, quality is sacrificed.
If someones previous actions are any indication of their future actions, then I predict the deletion and removal of access will happen at any moment. 7-11-2020.

"07/13/20 This Website Has Been Taken Down" ... again :lol:
k9amt
Posts: 7
Joined: Sun Jan 19, 2020 7:38 pm

Re: UPDATED: HS_Dual_hat locks up Pi Zero when screen is connected

Post by k9amt »

Yes it behaves that way as expected WITHOUT the screen connected. All flash, slow red flash, fast red flash. I have other pi-zero MMDVM setups and this one just seems wonky, and chinese.
k9amt
Posts: 7
Joined: Sun Jan 19, 2020 7:38 pm

Re: UPDATED: HS_Dual_hat locks up Pi Zero when screen is connected

Post by k9amt »

Found the issue : A failing USB power supply that wasn't supplying correct milliamp rating to the PI or MMDVM. Talk about random!
KE7FNS
Pi-Star Team
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Re: UPDATED: HS_Dual_hat locks up Pi Zero when screen is connected

Post by KE7FNS »

k9amt wrote: Thu Dec 03, 2020 2:12 am Found the issue : A failing USB power supply that wasn't supplying correct milliamp rating to the PI or MMDVM. Talk about random!
That would explain it. That must be a really crappy power supply, cause a RPi Zero W only draws 350 mA max at 100% CPU and when a keyboard, mouse AND monitor are all hooked up. A 3.5 inch Nextion only consumes ~145mA too. Thats pretty bad if your supply couldn't even maintain what was needed.
If someones previous actions are any indication of their future actions, then I predict the deletion and removal of access will happen at any moment. 7-11-2020.

"07/13/20 This Website Has Been Taken Down" ... again :lol:
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G8SEZ
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Re: UPDATED: HS_Dual_hat locks up Pi Zero when screen is connected

Post by G8SEZ »

Unless it's rated at 1.5A minimum I don't bother buying a USB power supply, for the newer Pi variants I use the recommended supplies.

Over the past 4 years I have had 3 cheaper supplies fail, there is really no advantage in saving a few dollarpounds as you end up spending them, plus extra, again.
--

Brian G8SEZ
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