Published May 15, 2020 © GPL3+

Portable Thermometer with Android Device

How to make a portable thermometer sensor MLX90614 with an Android device as display.

BeginnerFull instructions provided2 hours13,958

Impact Prize - Bonus

The COVID-19 Detect & Protect Challenge

Portable Thermometer with Android Device

Things used in this project

Hardware components

Arduino Nano R3

mlx90614

Software apps and online services

https://play.google.com/store/apps/details?id=io.cordova.sensorsuhu&hl=en

Hand tools and fabrication machines

Soldering iron (generic)

Solder Wire, Lead Free

Story

Measuring body temperature with non-contact / contactless like a thermo gun. I created this project because Thermo Gun now is very expensive, so I must get alternative to make DIY. And the purpose is make with low budget version.

Wiring Connection (Hardware)

MLX 90614 have I2C communication, so in Arduino Nano use pin A4 & A5

1 / 2 • Wiring Connection Arduino and MLX90614

Prepare Programming (Software)

For library MLX90614 I use adafruit library, you can Open Arduino IDE and menu Tools -> Manage Libraries -> search MLX90614. and click Adafruit MLX90614 Library then click install in Library Manager

Library MLX90614

Test Example From Library

To make sure that mlx90614 sensor can work, open Arduino IDE, Click File -> Examples -> Adafruit MLX90614 Library -> mlxtest.

Upload then see serial Monitor, you can see Ambient temperature and object temperature.

1 / 2 • Program Example and Serial Monitor

Prepare Circuit, OTG, and 3D Print Cover

1 / 4 • Finishing project

After sample MLX90614 code work, prepare circuit between arduino nano and mlx90614 sensor like a picture. For OTG you can make DIY with Male Microusb and Male Miniusb.

Cover Portable Thermometer can download file 3D in https://grabcad.com/library/portable-thermometer-box-1 and print with your 3Dprint Machine

Install App Portable Thermometer From Playstore

You can search in playstore "portable Thermometer" or you can click this link Portable Thermometer or you can scan this qr-code

1 / 2 • Download Portable Thermometer in playstore

Running Portable Thermometer

How to running Portable thermometer

Connect device in your smartphone with OTG.
Active OTG Connection in your smartphone
Run application
Click check now to check body temperature

Video Project Portable Thermometer

Video Portable Thermometer

Schematics

Code

Portable Thermometer Arduino Code

/*
 * MLX90614 Send to OTG
 * sekolahrobot@gmail.com
 */

#define LED 13
#include <Wire.h>
#include <Adafruit_MLX90614.h>

Adafruit_MLX90614 mlx = Adafruit_MLX90614();

unsigned long previousMillis;
int interval = 50;
char i;
int data = 0;
void setup() {
    Serial.begin(9600);
    mlx.begin(); 
    pinMode(LED, OUTPUT);
}

void loop() {
    if (Serial.available() > 0) {
        i = Serial.read();
        switch (i) {
            case '0':
                digitalWrite(LED, LOW);
                data = 0;
                break;
            case '1':
                digitalWrite(LED, HIGH);
                data = 1;
                break;
        }
    }
if (data==1)
  {
      if (millis() - previousMillis >= interval) {
          previousMillis = millis();
          Serial.print(mlx.readAmbientTempC()); 
          Serial.print(";");
          Serial.println(mlx.readObjectTempC());
      }
  }

}

Credits

SekolahRobot

6 projects • 17 followers

Sekolah Robot Indonesia is non formal education in Indonesia to learning about robot, and base on Community

Comments

Awards

Impact Prize - Bonus

The COVID-19 Detect & Protect Challenge

Portable Thermometer with Android Device