I’ve been trying to follow the instructions on instructibles ( Step 5: Mark Polarity (Using an Arduino))
The arduino nano doesn’t result in any thing shown there. Is this up to date?
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Hi @oodelallyx ,
Instructions should be up to date.
If you’re still not seeing a clear signal change:
- Ensure Clean Connections: Make sure the bare metal legs of the transducer are making solid contact with the jumper wires or breadboard points connected to A0 and GND. Wires should not be touching any other pins.
- Avoid Touching Wires: The instructions specifically warn, “It is important to not touch the transducers leg or the wires while doing that or the values will reset.” The human body can introduce noise or reset the reading.8
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Try the Backup Method (Poke Test): If the Arduino method fails, the Instructable suggests the older, “obsolete method” as a fallback.9
- Connect one wire to A0 and the other to GND as before.10
- Carefully poke the inside of the transducer with a thin, uninsulated wire or probe (like a stripped jumper wire).
- Spike Up → Mark the leg connected to A0 .12
- Spike Down → Mark the leg connected to GND .14
- Multimeter Method: An alternative method mentioned in some builds (Step 4 of the Instructables) is using a multimeter set to continuity or diode mode and touching the leads to the transducer legs to find the diode-like behavior, though this is less definitive for phase than the spike test.