1 files changed, 19 insertions, 0 deletions
diff --git a/include/voltdisc.h b/include/voltdisc.h
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--- /dev/null
+++ b/include/voltdisc.h
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+#pragma once
+
+// Volatge discovery. Determines what the voltage of the christmas lights is.
+//
+// This is done by using channel 0 of the ADC (which is on pin PA4). There is a
+// voltage divider from the main power source to pin PA4 which uses a 4.7MOhm
+// resistor and a 470KOhm resistor to divide the voltage by 10, which may then
+// be turned into a reading on the ADC.
+//
+// This helps to determine if the lights being driven are WS2812b's or WS2811 as
+// the latter are run on 12v and use RGB instead of GRB byte order.
+
+
+#include <stdint.h>
+
+typedef uint32_t millivolts_t;
+
+// Returns the estimated input voltage in millivolts.
+millivolts_t get_input_voltage();