Update README.md

bareboat-necessities · Nov 29, 2024 · c2addea · c2addea
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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
@@ -32,10 +32,14 @@ Output to esp32:
 
 ## ESP32 code
 
+### Interrupt counting
+
 Attach an interrupt handler function in RISING edge to analog input pin.
 
 Add logic to debounce interrupt. IF you do not know what 'debouncing of interrupt' you can google it.
 
+### Debouncing interrupts
+
 Debounce timeout. Let's say your engine RPM gauge goes to 5000 RPM and alternalor has N-poles.
 And "transfer number" on an alternator belt (makes alernator RPM differ from engine RPM).
 The ratio between alternator RPM and engine RPM is usually 2.5 to 1.
@@ -53,6 +57,8 @@ Let's say there are 12 poles on alternator N = 12, R = 1.
 
 So debouncing time of 200 microseconds should be reasonable.
 
+### Critical section of pulse counting
+
 On esp32 there has to be added some synchronization code on the critical section of interrupts (pulses) counting.