Products > Test Equipment
finding short on motherboards with a shorty (with display)
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eliocor:

--- Quote from: CaptainBucko on May 01, 2024, 03:13:16 am ---I have sourced all my components from LCSC and waiting for them to arrive, and happy to share the BOM if people want it. It's a bit different from JDobrey's which was from 2022.

--- End quote ---

If possible, yes. TIA
CaptainBucko:
Official Pages:
https://gitlab.com/jdobry/shortypen/
https://oshwlab.com/jdobry/shortypen

My BOM alternatives attached - Excel and PDF.

 |O |O SPECIAL NOTE: The original attached BOM from this post (May 1st 2024 until this edit June 19th 2024) had in error in the substitute for U1
Please see corrected BOMs attached  |O |O
Ocela:
After a certain period of operation of the device Shorty Pen (frequent calibrations), malfunctions began.
1. After switching to left-handed mode and turning off the device, it is no longer possible to fully return it back.
Plus, calibration no longer works in this mode. At 8.2 Ohm the device turns off without making a sound..
The device does not turn off normally (there is no sound signal and turns off only after the button is released)
2. Also... if during calibration you press the save button with the probes open, the device freezes.
You need to turn off the device again and repeat the calibration process again. I noticed that different devices may have different glitches, but the meaning of glitches is the same - it occurs when information is written to the EEPROM.
The REASON seems to be an overflow of EEPROM or accumulation of errors in the EEPROM..
After reflashing the MK - everything is OK!
Evi:
@kripton2035
what is the purpose of Q1 at all?
According code it is permanently ON.
kripton2035:

--- Quote from: Evi on May 18, 2024, 11:27:29 am ---@kripton2035
what is the purpose of Q1 at all?
According code it is permanently ON.

--- End quote ---
yes, it was connected only when measuring on the original device.
I recall it was because it had an auto shut off
here, as I use a mechanical switch to power it on, I did not need anymore.
also it should flow more current in the test probes than with the arduino outputs.
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