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
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.
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.
Component List
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.
