170 VGA Human Reaction Meter
170 : VGA Human Reaction Meter
- Author: Danil Karpenko
- Description: Ultra-precise human reaction meter
- GitHub repository
- Open in 3D viewer
- Clock: 40000000 Hz
How it works
It's an ASIC version of the original r0 project, optimized for a smaller area.
r0 lets you accurately measure human reaction time by interfacing with only a VGA-compatible monitor and a single button. The precision is ±1 microsecond.
The state is not synchronized with vsync, so the monitor may start displaying green from an arbitrary line. This forces you to watch the entire monitor instead of just the upper-left corner waiting for the first green pixel.
How to test
- Connect your monitor with Tiny VGA and the button (with pull-up resistor) to
ui[0]. - Make sure that the LFSR debug block looks like noise in the idle state.
- Press the button once to get ready.
- and as soon as you see green on the monitor, press the button as quickly as possible.
- Check the results of your reaction speed
- Try press earlier, the screen will turn red, which means that your reaction was false.
External hardware
- Tiny VGA
- Pulled-up button to
ui[0]
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | btn_n | R1 | |
| 1 | G1 | ||
| 2 | B1 | ||
| 3 | vsync | ||
| 4 | R0 | ||
| 5 | G0 | ||
| 6 | B0 | ||
| 7 | hsync |