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by franvajo
Fri Aug 16, 2019 10:30 am
Forum: Camera board
Topic: Fixed my zero w system lockups when using the camera
Replies: 18
Views: 5214

Re: Fixed my zero w system lockups when using the camera

Hi everybody, I also want to share my experience on this issue. I experienced the lockup when performing consecutive image captures with raspistill (latest version) on 8 different boards. The lockup seems to occur randomly in iterations smaller than 100. As already stated, setting over_voltage=2 fix...
by franvajo
Tue Jun 04, 2019 12:27 pm
Forum: Compute Module
Topic: Compute Module VBAT unregluated input
Replies: 0
Views: 299

Compute Module VBAT unregluated input

Hi,

is there anything against supplying VBAT via the unregulated output of a charge IC (voltage range: 3V to 5V)?
In principle this should be within the specification of the CM3+.

Thanks.
by franvajo
Mon Dec 11, 2017 2:20 pm
Forum: Advanced users
Topic: Raspberry Pi Zero W: Interference on 3.3V line when transmitting data over Wifi
Replies: 5
Views: 1132

Re: Raspberry Pi Zero W: Interference on 3.3V line when transmitting data over Wifi

Thanks for the detailed explanation. However, this does not explain the behaviour seen in the third attached image. There you can see, that the artefact is also visible on the 5V line and it has a similar amplitude.
But I will try it with a low-noise LDO powered by the 5V line.
by franvajo
Wed Nov 29, 2017 7:46 am
Forum: Advanced users
Topic: Raspberry Pi Zero W: Interference on 3.3V line when transmitting data over Wifi
Replies: 5
Views: 1132

Re: Raspberry Pi Zero W: Interference on 3.3V line when transmitting data over Wifi

You must mean 100mV, as that is what you are measuring. That's correct, I changed the typo, thanks. Variations on the +5V line are to be expected when the cable between your power supply has a high resistance, so that variations in current-use directly translate in variations in voltage drop over t...
by franvajo
Tue Nov 28, 2017 8:31 pm
Forum: Advanced users
Topic: Raspberry Pi Zero W: Interference on 3.3V line when transmitting data over Wifi
Replies: 5
Views: 1132

Raspberry Pi Zero W: Interference on 3.3V line when transmitting data over Wifi

Hi, I just noticed that there are frequent artefacts visible on the 5V and 3.3V line as well as on pulled high GPIOs of the Pi Zero W, when there is heavy load on the Wifi connection. Is this a known behavior? The amplitude of the interference is about 100mV, which is quite strong in my opinion. The...

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