![Miniature Frequency Probe measures 1Hz to 5MHz Miniature Frequency Probe measures 1Hz to 5MHz](https://www.electronics-lab.com/wp-content/uploads/2020/12/freqprobehand-e1607421912518.jpg)
David Johnson-Davies shared another great and mini project on his blog. He writes:
The Frequency Probe is a handheld tool designed to help you debug your circuits by giving a visual indication of the frequency or voltage at the probe. For a periodic waveform it gives a digital readout of the frequency, with a range of about 1Hz to 5MHz and an accuracy of better than 0.3%. For a voltage level it gives a readout of the voltage. It is based on an ATtiny84A, and is powered from a small Lipo cell.
Miniature Frequency Probe measures 1Hz to 5MHz – [Link]
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