Sep 302012
 

Just thought I’d post this up here for “backup” purposes… lately I’ve been doing a lot of AVR programming, the first step of course was to procure a programmer for the devices.

The following is a schematic for the programmer I have built myself. It can be built out of scrap bits, none of the components are critical in value.

It gets its name as it is essentially identical to the “DASA” serial cables, only all the signals are inverted.  The inverting buffers serve to provide voltage level conversion along with crude tri-state functionality when the AVR device is not being programmed.

Inverted-"DASA" serial programming cable for AVR

Inverted-“DASA” serial programming cable for AVR

The design is released under the TAPR Open Hardware License.