There is even a ready made [firmware project for an AVR ATtiny on GitHub](https://github.com/ericwazhung/avr-edid-spoofer) which allowed us to get started right away and save a lot of time. (Beware the code is a bit crappy, can only send a single EDID and has problems with high-byte EDIDs, aka almost every modern EDID)
[<img class="aligncenter size-large wp-image-1102" src="http://wp.realraum.at/wp-content/uploads/2018/09/edid_spoofing_cable.svg-982x1024.png" alt="edid_spoofing_cable-svg" width="750" height="782" />](http://wp.realraum.at/wp-content/uploads/2018/09/edid_spoofing_cable.svg.png)
There is even a ready made [firmware project for an AVR ATtiny on GitHub](https://github.com/ericwazhung/avr-edid-spoofer) which allowed us to get started right away and save a lot of time. (Beware the code is a bit crappy, can only send a single EDID and has problems with high-byte EDIDs, aka almost every modern EDID)
[<img class="aligncenter size-large wp-image-1102" src="http://wp.realraum.at/wp-content/uploads/2018/09/edid_spoofing_cable.svg-982x1024.png" alt="edid_spoofing_cable-svg" width="750" height="782" />](http://wp.realraum.at/wp-content/uploads/2018/09/edid_spoofing_cable.svg.png)