IoT Weight Scale using Load Cell HX711 & ESP8266

 

Video :-

Circuit Diagram :- 

HX711 (24 bit Analog to Digital Converter) :- 

HX 711 is a precision 24-bit analog to digital converter (ADC) specially designed for Weigh scales and industrial control applications to interface directly with a bridge sensor.

Code :-

//Prateek //www.prateeks.in #include <ESP8266WiFi.h> #include "HX711.h" #define BLYNK_PRINT Serial #include <Blynk.h> #include <BlynkSimpleEsp8266.h> #include <Wire.h> #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27, 16, 2); #define BLYNK_PRINT Serial const char *ssid = "JustDo"; // replace with your wifi ssid and wpa2 key const char *pass = "par12345"; char auth[] = "jf5vqqdqSziGVbsdgncbvP5CffTAgqiz"; // You should get Auth Token in the Blynk App. WiFiClient client; HX711 scale(D5, D6); int rbutton = D4; // this button will be used to reset the scale to 0. float weight; float calibration_factor = -107325; // for me this vlaue works just perfect 419640 void setup() { Serial.begin(9600); Wire.begin(D1, D2); lcd.begin(); lcd.backlight(); lcd.setCursor(3,0); lcd.print("Welcome To"); lcd.setCursor(0,1); lcd.print("JustDoElectronic"); delay(3000); lcd.clear(); lcd.setCursor(6,0); lcd.print("IoT"); lcd.setCursor(1,1); lcd.print("Weight Scale"); delay(3000); lcd.clear(); Serial.begin(115200); pinMode(rbutton, INPUT_PULLUP); scale.set_scale(); scale.tare(); //Reset the scale to 0 long zero_factor = scale.read_average(); //Get a baseline reading Blynk.begin(auth, ssid, pass); lcd.print("Connecting Wifi"); WiFi.begin(ssid, pass); { delay(1000); Serial.print("."); lcd.clear(); } Serial.println(""); Serial.println("WiFi connected"); lcd.clear(); lcd.print("WiFi connected"); delay(2000); } void loop() { Blynk.run(); scale.set_scale(calibration_factor); //Adjust to this calibration factor weight = scale.get_units(5); lcd.setCursor(0, 0); lcd.print("Measured Weight"); lcd.setCursor(0, 1); lcd.print(weight); lcd.print(" KG "); Blynk.virtualWrite(V3, weight); delay(2000); lcd.clear(); Serial.print("Weight: "); Serial.print(weight); Serial.println(" KG"); Serial.println(); if ( digitalRead(rbutton) == LOW) { scale.set_scale(); scale.tare(); //Reset the scale to 0 } }

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