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LM75 Temperature Sensor with 7 segment display output using PIC16F628

This is a test project built hastily on a solder less breadboard. It uses a LM75 to read the current temperature via I2C and displays the result on three 7 segment displays. It uses a PIC16F628 with an internal 4 Mhz clock.

⬇ View the code Circuit diagram
Tags: #pic12f628#sensor
Ibrar Ayyub By Ibrar Ayyub
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At a glance

CategorySensors & Temperature
PIC modelPIC16F628A
IncludesCode · Circuit diagram
Reading time~2 min

Summary of LM75 Temperature Sensor with 7 segment display output using PIC16F628

This article describes a hastily assembled test project using a solderless breadboard to read temperature via an LM75 sensor (I2C) and display it on three 7-segment displays. The system is controlled by a PIC16F628 microcontroller running at 4 MHz, with the program written in JAL. Due to the LM75's surface-mount package, wires were manually soldered for breadboard compatibility. A 5V regulator powers the circuit, though it is not included in the schematic.

Parts used in the LM75 Temperature Sensor Project:

  • Three 7SEG-CA 7-segment displays
  • PIC16F628 microcontroller
  • LM75 temperature sensor
  • Three BC557C PNP transistors
  • Two 12K resistors
  • Three 1K resistors
  • Six 220 ohm resistors
  • 5V voltage regulator

Temperature Sensor

The program was created using JAL

Note the LM75 is a surface mount device, so I had to solder wires onto it to use it on the solderless breadboard.

Sorry for the bad quality photo. The stuff on the left is a 5V voltage regulator and not shown on the schematic below.

Schematic Temperature Sensor

Component List

Code listing
Part     Value          Device      Package  Library        Sheet

D1                      7SEG-CA     7SEG-13  special        1
D2                      7SEG-CA     7SEG-13  special        1
D3                      7SEG-CA     7SEG-13  special        1
IC1      PIC16F628      PIC16F628   DIL18    microchip      1
IC2      LM75           LM75        SOP-8    andre_lm75     1
Q1       BC557C         BC557C      TO92-EBC transistor-pnp 1
Q2       BC557C         BC557C      TO92-EBC transistor-pnp 1
Q3       BC557C         BC557C      TO92-EBC transistor-pnp 1
R1       12K            R-EU_0207/7 0207/7   rcl            1
R2       12K            R-EU_0207/7 0207/7   rcl            1
R3       1K             R-EU_0207/7 0207/7   rcl            1
R4       1K             R-EU_0207/7 0207/7   rcl            1
R5       1K             R-EU_0207/7 0207/7   rcl            1
R7       220            R-EU_0207/7 0207/7   rcl            1
R8       220            R-EU_0207/7 0207/7   rcl            1
R9       220            R-EU_0207/7 0207/7   rcl            1
R10      220            R-EU_0207/7 0207/7   rcl            1
R11      220            R-EU_0207/7 0207/7   rcl            1
R12      220            R-EU_0207/7 0207/7   rcl            1
R13      220            R-EU_0207/7 0207/7   rcl            1
R14      220            R-EU_0207/7 0207/7   rcl            1

For more detail: LM75 Temperature Sensor with 7 segment display output using PIC16F628

  • How does the project read the current temperature?
    The LM75 reads the current temperature via I2C.
  • What component displays the result?
    The result is displayed on three 7 segment displays.
  • Which microcontroller is used in this project?
    A PIC16F628 with an internal 4 Mhz clock is used.
  • What programming language was used for the program?
    The program was created using JAL.
  • Why were wires soldered onto the LM75?
    Wires were soldered because the LM75 is a surface mount device.
  • Where is the 5V voltage regulator located?
    The 5V voltage regulator is on the left side of the photo.
  • Is the voltage regulator shown on the schematic?
    No, the 5V voltage regulator is not shown on the schematic.
  • What type of breadboard was used for assembly?
    A solder less breadboard was used for the test project.
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Ibrar Ayyub

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough...