How to Make a Temperature Gun With Esp32

Make an Infrared Thermometer Gun using FireBeetle EPS32

What a hot day it is! Too hot to drive and ride and I am thinking of making a temperature measurement sensor. With FireBeetle ESP32 produced by DFRobot and MLX90614 (a noncontact IR temperature sensor) on hand, let’s do it!

Hardware List

FireBeetle ESP32 IOT Microcontroller ×1

Gravity: Non-contact IR Temperature Sensor for Arduino ×1

Gravity I2C OLED-2864 Display ×1

3.7V 400mAh Lithium battery ×1

Red laser transmitter (diameter: 6mm) ×1

C&K slide switch ×1

3D printing crust set (2 parts) ×1

Tools

Thermo-control Anti-Static Soldering Station AT936b

Overlord Pro 3D printer

401 glue

Hot melt gun

Software List

MLX90614.py (library file of MLX90614 noncontact IR temperature sensor)

SSD1306.py (library file of Gravity IIC OLED-2864 display)

piclib.py (library file of show pictures and 16*24 script used in the project)

InfraRedThermometer.py (source files of project codes)

uPyCraft MicroPython IDE

PCtoLCD2002 LCD impression taking software

3D printing slice software: Cura

3D printing file: 3D print - left part.stl (available for direct printing of Overload Pro 3D printer)

3D printing file: 3D print - right part.stl

Solder Components As Below

Transform Show Pictures and 16*24 Script in Use to Hexadecimal Code With PCtoLCD2002 LCD Impression Taking Software

Programing With UPyCraft MicroPython IDE and Burn Codes to FireBeetle ESP32

Check After Codes Burnt

import MLX90614from machine import Pin,I2C
import time
import ssd1306
from piclib import *
# This code will show you how to make a Infra Red Thermometer using the MLX90614 sensor.
 
 
i2c = I2C(scl=Pin(22), sda=Pin(21), freq=100000)
ir=MLX90614.MLX90614(i2c)
lcd=ssd1306.SSD1306_I2C(128,64,i2c)
 
#Display a picture 72*64 
def DisplayPicture(x,y,picture):
  for line in range(0,64):
    for bytes in range(0,9):
      for bits in range(0,8):
        if picture[9*line+bytes]&0x80>>bits:
          lcd.pixel(x+bytes*8+bits,y+line,1)
        else:
          lcd.pixel(x+bytes*8+bits,y+line,0)
  return
 
#Display a character 16*24 
def DisplayCharacter16X24(x,y,character):
  for line in range(0,24):
    for bytes in range(0,2):
      for bits in range(0,8):
        if character[line*2+bytes]&0x80>>bits:
          lcd.pixel(x+bytes*8+bits,y+line,1)
        else:
          lcd.pixel(x+bytes*8+bits,y+line,0)
  return
 
#---------------------run here------------------------------------  
#display logo
DisplayPicture(28,0,picture) 
lcd.show()
time.sleep(1)
lcd.fill(0)
 
#display O:123.4C
#        A:123.4C 
DisplayCharacter16X24(0,0,charArray[10]) #O
DisplayCharacter16X24(16*1,0,charArray[12]) #:
DisplayCharacter16X24(16*7,0,charArray[13]) #C
 
DisplayCharacter16X24(0,24,charArray[11]) #A
DisplayCharacter16X24(16*1,24,charArray[12]) #:
DisplayCharacter16X24(16*7,24,charArray[13]) #C
lcd.show()
 
 
while True:
  time.sleep(0.2)
  Object = ir.getObjCelsius() #  *C
  Ambient = ir.getEnvCelsius() # *C
  #Object = ir.getObjFahrenheit() # *F
  #Ambient = ir.getEnvFahrenheit() # *F
  #print("Object  %s *C"% Object)
  #print("Ambient %s *C"% Ambient)
  #print()
  ObjectInt = int(Object*10)
  AmbientInt = int(Ambient*10)
  if ObjectInt < 0:
    ObjectInt = abs(ObjectInt)
    DisplayCharacter16X24(16*2,0,charArray[15])# -
    temp1 = (ObjectInt%1000)//100
    if(temp1 == 0):
      DisplayCharacter16X24(16*3,0,charArray[16]) # space
    else:
      DisplayCharacter16X24(16*3,0,charArray[temp1])
    DisplayCharacter16X24(16*4,0,charArray[(ObjectInt%100)//10])
    DisplayCharacter16X24(16*5,0,charArray[14]) # .
    DisplayCharacter16X24(16*6,0,charArray[ObjectInt%10]) 
    
  else:
    temp1 = ObjectInt//1000
    temp2 = (ObjectInt%1000)//100
    if temp1 == 0:
      DisplayCharacter16X24(16*2,0,charArray[16]) # space
    else:
      DisplayCharacter16X24(16*2,0,charArray[temp1])
    if temp1 == 0 and temp2 == 0:
      DisplayCharacter16X24(16*3,0,charArray[16]) # space
    else:
      DisplayCharacter16X24(16*3,0,charArray[temp2])
    DisplayCharacter16X24(16*4,0,charArray[(ObjectInt%100)//10])
    DisplayCharacter16X24(16*5,0,charArray[14]) # .
    DisplayCharacter16X24(16*6,0,charArray[ObjectInt%10]) 
  
  if AmbientInt < 0:
    ObjectInt = abs(AmbientInt)
    DisplayCharacter16X24(16*2,24,charArray[15])# -
    temp1 = (AmbientInt%1000)//100
    if temp1 == 0:
      DisplayCharacter16X24(16*3,24,charArray[16]) # space
    else:
      DisplayCharacter16X24(16*3,24,charArray[temp1])
    DisplayCharacter16X24(16*4,24,charArray[(AmbientInt%100)//10])
    DisplayCharacter16X24(16*5,24,charArray[14]) # .
    DisplayCharacter16X24(16*6,24,charArray[AmbientInt%10]) 
    
  else:
    temp1 = AmbientInt//1000
    temp2 = (AmbientInt%1000)//100
    if temp1 == 0:
      DisplayCharacter16X24(16*2,24,charArray[16]) # space
    else:
      DisplayCharacter16X24(16*2,24,charArray[temp1])
    if temp1 == 0 and temp2 == 0:
      DisplayCharacter16X24(16*3,24,charArray[16]) # space
    else:
      DisplayCharacter16X24(16*3,24,charArray[temp2])
    DisplayCharacter16X24(16*4,24,charArray[(AmbientInt%100)//10])
    DisplayCharacter16X24(16*5,24,charArray[14]) # .
    DisplayCharacter16X24(16*6,24,charArray[AmbientInt%10])  
  lcd.show()

Designing Crusts According to Dimension of Components

Use Cura (a 3D Printing Slice Software) to Make 3D Printing Files

Print Crusts With Overload Pro 3D Printer

Allocate Components to Inner Part of Printed Crusts With Hot Melt and Glue

Temperature Measurement

Measure temperature of freezer