An ultra-mini frequency probe designed by foreign expert David Johnson. This frequency probe can help you debug the circuit by displaying frequency and voltage. It can measure periodic waveforms from 1Hz to 5MHz with an accuracy of 0.3%. Of course, it can also be used as a voltmeter. Use it to tell you the current voltage value.
Assembly includes:
1. The ATtiny84A comes in a SOIC package, the resistors, capacitors and diodes are all 0805 size, so hand soldering should be relatively easy.
2. The crystal is 5x3.2mm
3. The display is an OLED 128x32 I2C display module driven by SSD1306
4. An ordinary clothing needle is used as a probe
5. A 40mAh Lipo battery is used and is fixed to the board through a double-sided self-adhesive foam pad Power the board
Blockdiagram
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