- Signal generator with Arduino control.
- Easy to see it in on the data.
- Can be automated to generate different frequencies.
- Maybe it is not working anymore (need to find the code and test it.)
- Noise source with step-up power converter.
- Already working just put some tape or ziptires.
- Higher power consumption.
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Power supply.
The quick and easy solution is use 4 AA batteries, but is heavy, maybe opening a cheap USB battery will be lighter after removing the external plastic.
