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Added formula to readme.
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@ -14,6 +14,10 @@ https://revspace.nl/MHZ19
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## Implementation
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```
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C ppm = 5000 * (T_high - 2 ms) / (T_high + T_low - 4ms)
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```
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The implementation is mostly based on https://forum.arduino.cc/index.php?topic=525459.msg3587557#msg3587557
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