Read lipo charging progress?

[glowingkitty]

Is there a way how we can read the remaining battery level of a connected lipo battery / how much the battery is charged?

[capedra]

I would like to know about it either.

[JM-FRANCE]

same question (or just where to read the current battery voltage)

[nochlab1]

same question (or just where to read the current battery voltage)

Did you figure it out?

[nochlab1]

Is there a way how we can read the remaining battery level of a connected lipo battery / how much the battery is charged?

Did you figure it out?

[JM-FRANCE]

I dropped that board as there was no answer from LilyGO. Their PDF does not show any VBAT related connection to an ADC pin.

There was this discussion to read for a different board about reading VBAT

if you test and find out, please post back, that will surely help someone

[rigr]

I use code snippets found in the repo for TTGO-T-Display to monitor voltage of a lipo connected to the board. I call this function numerous times in my code - and if voltage is below 3,75V the board switches to deep sleep. Something alike might work for you, too.

void voltage(){
  digitalWrite(14, HIGH);
  delay(1);
  float measurement = (float) analogRead(34);
  float battery_voltage = (measurement / 4095.0) * 7.26;
  digitalWrite(14, LOW);
  Serial.println(battery_voltage);
  tft.setCursor(170, 98);
  tft.print(battery_voltage);
  tft.print("V ");
  if (battery_voltage < 3.75){    //////////////////////////
    Serial.println("Going to sleep now.");
    tft.fillScreen(TFT_BLACK);
    tft.setCursor(0,0);
    tft.setTextSize(3);
    tft.println("LOW  BATTERY");
    tft.println(" ");
    tft.println("NOW GOING TO");
    tft.println(" ");
    tft.print("DEEP   SLEEP");
    delay(20000);
    esp_deep_sleep_start(); // to save the lipo - no wakeup.
    // RETURN;
  }  
}

[fgnievinski]

a practical answer:
Xinyuan-LilyGO/TTGO-T-Display#35 (comment)