Replica CW32 Multifunctional Test Pen

 
The test pen operates by simply tapping and holding a node on the circuit board to perform tests.
Some basic functions of the test pen include:
1. Voltage measurement + threshold judgment: The threshold level can be set to meet different logic level scenarios, and it retains the useful traffic light indicator function of the "simple logic level test pen";
2. Continuity measurement: The threshold resistance can be adjusted as needed (this is a feature only found in multimeters costing thousands of yuan, and I want to add it to my test pen);
3. Diode measurement: Measure the conduction voltage and light up a diode (Note! Not a transistor!!!);
4. PWM output: Convenient for providing a known quantity to test the system in some scenarios, and can also be used to test passive buzzers, etc.;
5. PWM input: Can measure frequency (and even perform simple decoding and display of serial port data, although this is not yet implemented due to current technology limitations);
6. DC output: Simulates a required DC level for testing.