LED Dimmer
A transistor circuit that dims an LED with a potentiometer, using a 5 V supply, a 2N2222 transistor, and resistors.
Key Features
- Uses the 10K Potentiometer
Key Benefits
- Free, open lessons. The Moving Rainbow textbook has the kit page, wiring, and MicroPython code.
- Try before you build. An interactive MicroSim on the kit page runs in the browser.
- Budget. About $4–$6 (estimate: breadboard $2, 2N2222 transistor, potentiometer, LED and resistors, each under $1).
Parts
| 10K Potentiometer | Input knob |
| 830-Point Breadboard ($1.10) | Breadboard |
Microcontroller listed first. Prices shown only where known; see the source book for quantities, wiring, and current prices.
About this kit: From the Moving Rainbow collection.
Source: Moving Rainbow