ECA: Ethanol Content AnalyzerEthanol 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.
Pins| Type | Pin | Description |
|---|---|---|
| Sensor In | D8 |
TIMER1 / ICP1 |
| PWM Output | D3/D11 |
Built-in PWM driver |
| DAC Output | A4/A5 |
MCP4725 12bit DAC |
Hz -> E % -> V| 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 |
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