Display Temperature From HTU21D As Bargraph On LCD - RoboJax

Display Temperature from HTU21D as bargraph on LCD

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Display Temperature from HTU21D as bargraph on LCD1602-I2C with Arduino

This displays temperature as bargraph on LCD1602-I2C or LCD2004-I2C

Related HTU21DF Videos

-Basic code using HTU21DF Humidity and Temperature Sensor with Arduino -Custom code using HTU21DF Humidity and Temperature Sensor with Arduino -Using 2 more HTU21DF Humidity and Temperature Sensor with Arduino -LCD1602 or LCD2004 with HTU21DF Humidity and Temperature Sensor with Arduino -Display Temperature from HTU21D as bargraph on LCD with Arduino

Resources for this sketch

• HTU21DF Datasheet (PDF)
• Adafruit HTU21DF Library (getHub)
• Adafruit HTU21DF Library (Robojax.com)
• LCD1602-I2C video and code (Must watch)
• Introduction to HTU21D video and code (Must watch)

/* * Display Temperature from HTU21D(F) on LCD as bargraph * Written and Update by Ahmad Shamshiri on July 18, 2019 * for Robojax in Ajax, Ontario, Canada Watch Video tutorial for this code :https://youtu.be/kpGvzNWLHuk Must watch: 1- Introduction to HTU21DF https://youtu.be/Q5y18rgTAhA 2- LCD1602-I2C video: https://youtu.be/q9YC_GVHy5A * Original Sources: * LCD library: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library * Bargraph library from https://playground.arduino.cc/Code/LcdBarGraph/ * * * Robojax Arduino Course on Udemy where you get Schematic Diagram of this sketch * and many other robotics related lectures and codes. Purchase the course here: http://bit.ly/rj-udemy - (GND) to GND + (VDD) to 3.3V (WARNING: do not connect + to 5V or the sensor will be damaged!) */ #include <Wire.h> #include "Adafruit_HTU21DF.h" Adafruit_HTU21DF htu = Adafruit_HTU21DF(); #define maxValue 160 // is the value in celsius or farenheit set in line above // LCD settings #include <LiquidCrystal_I2C.h> byte lcdNumCols = 16; // -- number of columns in the LCD byte lcdLine = 2; // -- number of line in the LCD LiquidCrystal_I2C lcd(0x3f,lcdNumCols,lcdLine); //0x3f is address for I2C // to get I2C address, run I2C Scanner. //Link is provided (in same page as this code) at http://robojax.com/learn/arduino // bargraph settings #include <LcdBarGraphRobojax.h> LcdBarGraphRobojax robojax(&lcd, 16, 0, 0); // -- creating 16 character long bargraph starting at char 0 of line 0 (see video) void setup() { Serial.begin(9600);//initialize serial monitor // -- initializing the LCD lcd.begin(); lcd.clear(); lcd.print("Robojax"); // Initialize the sensor (it is important to get calibration values stored on the device). if (htu.begin()) { lcd.setCursor (0,1); // lcd.print("HTU21DF Bargraph"); }else { lcd.setCursor (0,1); // lcd.print("missing HTU21DF"); while(1); // Pause forever. } // -- give use some time to read the text above delay(2000); lcd.clear(); }// setup void loop() { // Robojax HTU21DF Bargraph main loop robojax.clearLine(1);// clear line 1 to display fresh temperature float T = getHTU('H');// get the temperature float Tgraph=T; if( Tgraph > maxValue){ Tgraph =0; } robojax.drawValue( Tgraph, maxValue);// draw the bargraph // Print out the measurement: Serial.print("temperature: "); Serial.print(T,2); lcd.setCursor (0,1); // if(T< maxValue){ lcd.print("Temp.:"); //lcd.print("Humi.:"); }else{ lcd.print("Max.:"); } lcd.setCursor (7,1); // lcd.print(T); // print lcd.print((char)223);// prints degree symbol //lcd.print("%");// prints degree symbol lcd.print("C");// delay(500); } /* * @brief returns temperature or relative humidity * @param "type" is character * C = Celsius * K = Keliven * F = Fahrenheit * H = Humidity * @return returns one of the values above * Usage: to get Fahrenheit type: getHTU('F') * to print it on serial monitor Serial.println(getHTU('F')); * Written by Ahmad Shamshiri on July 13, 2019 * in Ajax, Ontario, Canada * www.Robojax.com */ float getHTU(char type) { float value; float temp = htu.readTemperature(); float rel_hum = htu.readHumidity(); if(type =='F') { value = temp *9/5 + 32;//convert to Fahrenheit }else if(type =='K') { value = temp + 273.15;//convert to Kelvin }else if(type =='H') { if(rel_hum<0){rel_hum =0;}//prevents it from negative value value = rel_hum;//return relative humidity }else{ value = temp;// return Celsius } return value; }//