search

norbert-walter / esp32-nmea2000-obp60

nmea2000 gateway with ESP32
GNU General Public License v2.0
14 stars 10 forks source link

OBP60 hardware: LED pairs flickering at random #60

Closed W-Geronius closed 2 years ago

W-Geronius commented 2 years ago

At random occasions backlight LEDs (pairs) were either slightly dimmed or started flickering. Resoldering the right 2 LED + resistor + transistor possibly cured the problem and for a couple of days no further problems were observed.

This morning however, the two leftmost LED started flickering. Cold reboot temporarily solved it. Now the middle two LED are slightly dimmed, the leftmost two minimally flickering, the right two are still perfect.

W-Geronius commented 2 years ago

are you sure, flickering is totally unaffected by software? First time now I am observing all 6 LEDs flickering - all at the same rate, could be a pattern.

W-Geronius commented 2 years ago

First time now I am observing all 6 LEDs flickering - all at the same rate, could be a pattern.

Scratch that, sorry!

Simple solution: looked like too little power and so it was ... maybe add this to docs! However, the display runs surprisingly well under these circumstances!

The display was powered solely via PC USB port:

image

btw: the PC USB delivers ~5V, just 3.4V are displayed here ?

norbert-walter commented 2 years ago

Yes, you can not powering the MFD via USB. Any ports supports only 500mA and the voltage loss is to big. Use allways 12V for powering.