A simple bubble counter for a Wemos D1 mini lite

bubble-counter.cpp

/* 

Bubble Counter for fermentation processes

Made by: Joost Plattel
Email: [email protected]

This little arduino project is used for tracking fermentation processes 
it works with a little photo interupter and posts the bubble count every 
10 minutes to a endpoint specified.

*/

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>

bool DEBUG = true;

int sensorPin = 0; // select the input pin for the photo interrupter
int sensorValue = 0; // variable to store the value coming from the sensor
int ledPin = 5; // D1 on the WEMOS
int bubbleCount = 0; // Count for bubbles (resets after sending)
int timer = 0; //
int timerTrigger = 12000; // 50ms * 10 * 60 * 10 = 12000 = every 10 minutes

const char* ssid = "wifissid";
const char* password = "password";
const char* endpoint = "http://yourendpoint.beer;

HTTPClient http;

void setup() {
    pinMode(ledPin, OUTPUT);   
    
    Serial.begin(9600);  // set up Serial library at 9600 bps
    // Connect to WiFi network
    Serial.println();
    Serial.print("Connecting to ");
    Serial.println(ssid);

    // Connect to wifi
    WiFi.begin(ssid, password);

    // Blink the green LED when it is connecting
    while (WiFi.status() != WL_CONNECTED) {
        digitalWrite(ledPin, HIGH);
        delay(500);
        Serial.print(".");
        digitalWrite(ledPin, LOW);
        delay(500);
    }

    Serial.println("Connected!");
}

void loop() {
    // read the value from the sensor
    sensorValue = analogRead(sensorPin); 

    // print the sensor value to the serial monito
    // if (DEBUG) { Serial.println(sensorValue); }

    if (sensorValue < 100) {
        // Blink the green LED.
        digitalWrite(ledPin, HIGH);
        bubbleCount++; // Increment bubble count
        if (DEBUG) { Serial.println("Bubble!"); }
    }

    // Increment the timer
    delay(50);
    timer++;

    if (timer > timerTrigger) {
        digitalWrite(ledPin, HIGH);
        // Make a request to the endpoint with the bubble count
        http.begin(endpoint);
        http.addHeader("Content-Type", "application/json");
        int httpCode = http.POST("{'bubbles': " + String(bubbleCount) + "}");
        
        // Print status-code and close the connection
        Serial.println(httpCode); // Print HTTP return code
        http.end();  //Close connection

        // Reset timer 
        timer = 0;
    }

    // Turn of the green LED
    digitalWrite(ledPin, LOW);
}