From 1f9326f996afab08f6e42832c4d9d99e653d58cb Mon Sep 17 00:00:00 2001 From: Mikhail Grushinskiy Date: Fri, 29 Nov 2024 13:22:17 -0500 Subject: [PATCH] Update README.md --- bbn_m5atomS3_lite_alternator_freq_to_RPM/README.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/bbn_m5atomS3_lite_alternator_freq_to_RPM/README.md b/bbn_m5atomS3_lite_alternator_freq_to_RPM/README.md index 7a721be..0df6039 100644 --- 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) + + +There are different variations of the board for 12V input signal or 24V with different pull down resistor on the board. + +Select appropriate for your alternator voltage. + +Alternator has a terminal marked 'W' which output a sine wave form of the alternator output.