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ECA: Ethanol Content Analyzer

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.

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

License

MIT © Nicholas Berlette

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