- on Microcontrollers
- Published in issue 7/2008 on page 93
This circuit was developed as part of the current Elektor AVR-ATM18 project series. Troubled by a nagging feeling that a circuit is not a proper circuit unless it contains at least one active component, the author added an LED to show when data transfer is occurring. In fact, this visual feedback is extremely helpful when troubleshooting, and is a worthwhile addition even if our aim is to make the simplest possible programmer.