Add MeshCore relay_radio firmware for Heltec T114

variants/thinknode_m3/ThinkNodeM3Board.cpp

@@ -0,0 +1,28 @@
+#include <Arduino.h>
+#include "ThinkNodeM3Board.h"
+#include <Wire.h>
+
+#include <bluefruit.h>
+
+void ThinkNodeM3Board::begin() {
+  NRF52Board::begin();
+  btn_prev_state = HIGH;
+
+  Wire.begin();
+
+  delay(10);   // give sx1262 some time to power up
+}
+
+uint16_t ThinkNodeM3Board::getBattMilliVolts() {
+  int adcvalue = 0;
+
+  analogReference(AR_INTERNAL_2_4);
+  analogReadResolution(ADC_RESOLUTION);
+  delay(10);
+
+  // ADC range is 0..2400mV and resolution is 12-bit (0..4095)
+  adcvalue = analogRead(PIN_VBAT_READ);
+  // Convert the raw value to compensated mv, taking the resistor-
+  // divider into account (providing the actual LIPO voltage)
+  return (uint16_t)((float)adcvalue * ADC_FACTOR);
+}