Initial Commit

.gitignore

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+
+ESP32_TouchDown_Battery_Demo/.DS_Store
+Hardware/.DS_Store
+.DS_Store

ESP32_TouchDown_Battery_Demo/ESP32_TouchDown_Battery_Demo.ino

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+/*  ESP32 TouchDown Battery Monitoring Demo 
+ *  by: Dustin Watts
+ *  date: 29-10-2020
+ *  
+ *  This demo uses the BATT_DIV pin (GPIO35) which uses the ADC that is connected to 
+ *  a 100K/100K voltage divider. It takes a number of readings that are all added to
+ *  totalReadings, with a delay in between.
+ *  
+ *  After that the total of the ADC readings is divided by the number of readings to get
+ *  an average. This is then multiplied by a multiplicationFactor to convert the analog 
+ *  readings to the voltage it represents. Because this gives the voltage in mV, the result 
+ *  is divided by 1000 to get the voltage in V. This voltage is then printed to serial.
+ *  
+ *  It then waits a second and repeats.
+ *  
+ */
+
+uint8_t BATT_DIV = 35;
+uint16_t totalReadings = 0;
+uint8_t numReadings = 8;
+float multiplicationFactor = 1.782;
+uint8_t sampleTimeDelay = 250;
+
+void setup() {
+
+  Serial.begin(9600);
+
+}
+
+void loop() {
+
+  // Measure battery voltage
+  for(int i=0; i < numReadings; i++)
+  {
+    uint16_t adcReading = analogRead(BATT_DIV);
+    totalReadings = totalReadings + adcReading;
+    delay(sampleTimeDelay);
+  }
+
+  // Average and convert to Volts
+  float voltage = (totalReadings/numReadings) * multiplicationFactor;
+  Serial.print("Battery Voltage = ");
+  Serial.print(voltage / 1000);
+  Serial.println("V");
+  delay(1000);
+
+  // Empty the totalReadings for the next time it is used.
+  totalReadings = 0;
+
+}