Ethanol Content Analyzer for Arduino Nano or Uno.
Converts digital FlexFuel sensor data (50~150 Hz) into analog (0-5v or 0.5-4.5v), for tuners, datalogs, and in-dash gauges.
| Type | Pin | Description |
|---|---|---|
| Sensor In | D8 |
TIMER1 / ICP1 |
| PWM Output | D3/D11 |
Built-in PWM driver |
| DAC Output | A4/A5 |
MCP4725 12bit DAC |
| Input (Hz) | E (%) | Output (V) |
|---|---|---|
50 hz |
0 % |
0.50v |
100 hz |
50 % |
2.25v |
150 hz |
100% |
4.50v |
| Errors | ||
< 50 hz |
--- |
4.80v - contaminated |
> 150 hz |
--- |
4.90v - high water level |
<= 0 hz |
--- |
0.10v - disconnected |