Ammeter Script
- Right-click ammeter_cyberscope.hex and select Save link as… to download.
- Open it (python.microbit.org/v/2 matches the screencaptures).
- Click Connect, then Flash, then Disconnect.
Ammeter Tests
You are now ready to measure current through the LED.
- Go to cyberscope.parallax.com and click Connect.
- Check the meter. With a 220 Ω resistor, the current should be in the 5 mA neighborhood.
The m in mA is the metric prefix for milli or “1/1000th of”. In this case, the current measurement is 5.108 mA, or 5.108 thousandths of an amp.
Try This
- Try replacing the 220 Ω resistor in the DC LED circuit with a 1 kΩ (brown-black-red) resistor.
- Repeat this with a 2 kΩ.
- Also, try reversing the red and black probe ends in the LED circuit. Is the measurement negative?