From :
https://www.engineersgarage.com/nodemcu-battery-voltage-monitor//*****************************************************
* Date: 18 june 2018
* Written by: Usman Ali Butt
* Property off: microcontroller-project.com
* ***************************************************/
#include <ESP8266WiFi.h>
const char* ssid = "Your SSID";
const char* password = "Your Wifi Password";
int BAT= A0; //Analog channel A0 as used to measure battery voltage
float RatioFactor=5.714; //Resistors Ration Factor
WiFiServer server(80);
void setup() {
Serial.begin(9600);
delay(10);
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
server.begin(); // Start the server
Serial.println("Server started");
// Print the IP address on serial monitor
Serial.print("Use this URL to connect: ");
Serial.print("http://"); //URL IP to be typed in mobile/desktop browser
Serial.print(WiFi.localIP());
Serial.println("/");
}
void loop() {
int value = LOW;
float Tvoltage=0.0;
float Vvalue=0.0,Rvalue=0.0;
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
// Wait until the client sends some data
Serial.println("new client");
while(!client.available()){
delay(1);
}
// Read the first line of the request
String request = client.readStringUntil('\r');
Serial.println(request);
client.flush();
// Match the request
if (request.indexOf("/bat=ON") != -1) {
/////////////////////////////////////Battery Voltage//////////////////////////////////
for(unsigned int i=0;i<10;i++){
Vvalue=Vvalue+analogRead(BAT); //Read analog Voltage
delay(5); //ADC stable
}
Vvalue=(float)Vvalue/10.0; //Find average of 10 values
Rvalue=(float)(Vvalue/1024.0)*5; //Convert Voltage in 5v factor
Tvoltage=Rvalue*RatioFactor; //Find original voltage by multiplying with factor
/////////////////////////////////////Battery Voltage//////////////////////////////////
value = HIGH;
}
// Return the response
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println(""); // do not forget this one
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.println("Battery Voltage =");
client.print(Tvoltage);
client.println("<br>");
if(value == HIGH) {
client.println("Updated");
} else {
client.print("Not Updated");
}
client.println("--------");
if(Tvoltage<=5){
client.println("Battery dead OR disconnected");
}
else if(Tvoltage>5 && Tvoltage<=10){
client.println("Need Imediate recharge");
}
else if(Tvoltage>10 && Tvoltage<=12){
client.println("Recharge");
}
else{
client.println("Battery Full");
}
client.println("<br><br>");
client.println("<a href=\"/bat=ON\"\"><button>Status</button></a><br />");
client.println("</html>");
delay(1);
Serial.println("Client disonnected");
Serial.println("");
}
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