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Some old AVR projects
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avr-projects/projects/keyboard-lamp/README.md

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Keyboard Lamp

This is a keyboard lamp with adjustable brightness, that remembers last brightnbess level even when powered off.

I've made it as a replacement for my broken ThinkLight.

It uses ATtiny13, and the schematic is something like this:

                             Vcc
                              |
              ,---------------+
              |               |
              |  +----u----+  |
              '--|         |--'
                 |  ATMEL  |       Buttons
 ,--[180R]-|<|---|         |--BRT----o/ o---,
 |        LED2   |  ATtiny |                |
 |              -|    13   |--DIM----o/ o---+--- GND
GND              |         |
              ,--|         |----,
              |  +---------+    |           LED1
              |                 |         ,-|<|--[47R]-- Vcc
             GND                |         |
                                '-[10k]-|<  Transistor NPN
                                          |
                                         GND

LED1 is the bright white LED, LED2 is an indicator that the brightness has been saved. You can leave LED2 out if you want.

Fuses and other settings can be found in the Makefile.