Electronics > Beginners

Pulling my hair out. Circuit boards stop working once shipped to client and more

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mikeselectricstuff:

--- Quote from: mcinque on June 06, 2019, 08:35:03 am ---
--- Quote from: Jackster on June 06, 2019, 07:58:36 am ---I am not sure what was wrong with them other than the firmware stops running as it should be.
Power is fine, sensor input is fine.
The only thing it could be is the MCU or WiFi board.

--- End quote ---
As I (and the wise Mike) said: check the crystal/oscillator. Put an oscilloscope to see if it's working. Keep in mind correct probe range/capacitance while probing.
Also, "power is fine": did you check it with a DMM or with an oscilloscope?

--- End quote ---
Don't forget that the scope probe itself can start it oscillating. If possible use a x100 probe. Or better look at an output pin that is being toggled by software after startup

Jackster:
I don't have an oscilloscope. Just multi meter.

mcinque:
I bet that with an oscilloscope you could find the issue in minutes. Since you're doing circuits for work, consider purchasing one.

Jackster:

--- Quote from: mcinque on June 06, 2019, 12:03:36 pm ---I bet that with an oscilloscope you could find the issue in minutes. Since you're doing circuits for work, consider purchasing one.

--- End quote ---

Will a £50 USB one be enough?
https://www.amazon.co.uk/HANTEK-Portable-Based-Digital-Oscilloscope/dp/B00EEX1W5G/ref=sr_1_28?keywords=oscilloscope&qid=1559823810&s=gateway&sr=8-28

mikeselectricstuff:

--- Quote from: Jackster on June 06, 2019, 12:01:50 pm ---I don't have an oscilloscope. Just multi meter.

--- End quote ---
Buy one.
Without it you are pissing away your time.

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