Optimize battery voltage reading

5 days ago · 61a8821d3c
1 changed files with 2 additions and 0 deletions
--- a/variants/heltec_rc32/HeltecRC32Board.cpp
+++ b/variants/heltec_rc32/HeltecRC32Board.cpp
@ -55,6 +55,7 @@ void HeltecRC32Board::onAfterTransmit() {

 uint16_t HeltecRC32Board::getBattMilliVolts() {
  analogReadResolution(12);
+  analogSetAttenuation(ADC_2_5db);
  digitalWrite(PIN_ADC_CTRL, ADC_CTRL_ENABLED);
  delay(10);
  uint32_t raw = 0;
@ -62,6 +63,7 @@ uint16_t HeltecRC32Board::getBattMilliVolts() {
    raw += analogReadMilliVolts(PIN_VBAT_READ);
  }
  raw = raw / 8;
+  digitalWrite(PIN_ADC_CTRL, !ADC_CTRL_ENABLED);

  return (adc_mult * raw);
 }