#ATtiny85 UNO programmer

Simple little board for an ATtiny85 programmer for a UNO (plugs directly into the UNO )

Status LEDs are based on the default pinouts in ATTinyCore board as per the ArduinoISP example sketch copied here :

// Put an LED (with resistor) on the following pins:

// 9: Heartbeat - shows the programmer is running

// 8: Error - Lights up if something goes wrong (use red if that makes sense)

// 7: Programming - In communication with the target

Really simple circuit

Select resistors to give your prefered LED brightness.

Capacitor values are as recommended but anything similar will work - i used 47 uF for the electrolytic and it was fine.

The blue LED is on the ATtiny85 digital pin 3 - I use it as a quick check that the an ATtiny85 is ok by uploading a script that pulses that output. I also tend to use that pin as a digital out so it is a good visual check that the chip has been programmed successfully.