Update README.md

bareboat-necessities · Nov 29, 2024 · 1f9326f · 1f9326f
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diff --git a/bbn_m5atomS3_lite_alternator_freq_to_RPM/README.md b/bbn_m5atomS3_lite_alternator_freq_to_RPM/README.md
@@ -11,3 +11,10 @@ The circuit of the boars looks like this:
 
 
 ![PC817 optocoupler isolation module board](img/PC817_optocoupler_circuit.png)
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+There are different variations of the board for 12V input signal or 24V with different pull down resistor on the board.
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+Select appropriate for your alternator voltage. 
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+Alternator has a terminal marked 'W' which output a sine wave form of the alternator output.