Created
April 10, 2021 11:28
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Read battery voltage on TTGO Lora32
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#include <Arduino.h> | |
#include <Wire.h> // Only needed for Arduino 1.6.5 and earlier | |
const uint8_t blue = 23; | |
const uint8_t vbatPin = 35; | |
float VBAT; // battery voltage from ESP32 ADC read | |
void setup() | |
{ | |
Serial.begin(9600); | |
pinMode(blue, OUTPUT); | |
pinMode(vbatPin, INPUT); | |
} | |
void loop() | |
{ | |
delay(1000); | |
// Battery Voltage | |
VBAT = (float)(analogRead(vbatPin)) / 4095*2*3.3*1.1; | |
/* | |
The ADC value is a 12-bit number, so the maximum value is 4095 (counting from 0). | |
To convert the ADC integer value to a real voltage you’ll need to divide it by the maximum value of 4095, | |
then double it (note above that Adafruit halves the voltage), then multiply that by the reference voltage of the ESP32 which | |
is 3.3V and then vinally, multiply that again by the ADC Reference Voltage of 1100mV. | |
*/ | |
Serial.println("Vbat = "); Serial.print(VBAT); Serial.println(" Volts\n"); | |
} |
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; PlatformIO Project Configuration File | |
; | |
; Build options: build flags, source filter | |
; Upload options: custom upload port, speed and extra flags | |
; Library options: dependencies, extra library storages | |
; Advanced options: extra scripting | |
; | |
; Please visit documentation for the other options and examples | |
; https://docs.platformio.org/page/projectconf.html | |
[env:ttgo-lora32-v21] | |
platform = espressif32 | |
board = ttgo-lora32-v21 | |
framework = arduino | |
lib_deps = | |
adafruit/Adafruit GFX Library@^1.10.7 | |
SPI | |
adafruit/Adafruit BusIO@^1.7.3 | |
adafruit/Adafruit SSD1306@^2.4.4 |
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