VCC 3 TO 5.5V
8
C1 10 �F 16V
VCC
PB3
IC1 PB1 ATTINY15 4
GND
PB0
SQUARE-WAVE OUTPUT (FOUT)
3
6
R1 100 D1
5
Figure 3 An LED doubles as a light-level sensor. Output PB3 delivers a square wave whose frequency increases as light intensity increases.
edn061109di39803
DIANE
