The project describes a simple, low power, low cost shaft encoder built around a small stepper motor and an ATtiny13 microcontroller. It can be implemented as Jog Dials on portable devices (such as portable mp3 player) and low cost PDAs ; wherein the dial can be used to quickly type in a short message [...]
This is mini sound level monitor project. It will display fluctuating light bars as response of audio signal from Electret Microphone. The louder sound that come into this device, the brighter the light bar. This project use alkaline battery as power source.
The ‘brains’ of this project is a LM358 general-purpose op-amp. The front part [...]
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