A 555 timer simulator running on the ATTiny85 :)
For a more detailed description, check me out on Hackaday!
Essentially, the ATTiny555 will do these three functions:
- When the voltage on THRES rises above two-thirds of the input voltage, the OUT pin is pulled low and the DIS pin is set to sink current.
- When the voltage on TRIG drops below one-third of the input voltage, the OUT pin is pulled high and the DIS pin is set to high impedance (essentially making it float)
- When RESET is pulled low, OUT is pulled low and the DIS pin is set to high impedance.
Here’s a pinout of the ATTiny555, compared to a 555. Note that the ground and reset pins are switched.