A Video Lag Tester is a device that measures the delay from when a signal is sent to a displays input until it is shown on the display. In most cases this is an important parameters for a good gaming experince.

It is intended to be a low cost solution for video signals up to 720p 60 Hz. The cost for building it your self is ~$25 or less.

Sipeed Tang Nano 4k. Official reseller Sipeed`s AliExpress Store *.
Phototransistor for visable light with clear case. e.g. PT331C
NPN Transistor. e.g. BC547.
1k and 100k Resistor.

* I get commission if you buy using this link. It helps me to provide stuff like this. Thanks for your support!

You can build it as described below or use the PCB by Zwenergy

There is a case designed by john3d that can be 3D Printed. It fits with the PCB by Zwenergy.

Download and unpack the release zip file. Plug in a USB-C cable to the board. No driver needs to be installed.

Install openFPGALoader

run:
openFPGALoader -b tangnano4k -f firmware\video_lag_tester_720p60.fs

Double click on "load_720p.cmd"

This project is created by Patrik's Retro Tech. For updates and similar projects follow me on:
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Use: Gowin FPGA Designer 1.9.8.03 Education

Firmware is based on source code of Time sleuth