Summary of Digital Temperature Sensing using PIC16F676 with Proteus Simulation
This project demonstrates digital temperature sensing using a TC72 PICtail sensor interfaced to a PIC16F676 microcontroller, following Microchip AN940. Temperature is read via an SPI-style serial interface, converted to BCD in firmware (MPASM), and output on discrete pins to drive LEDs. Designed for Proteus VSM simulation, it’s suitable for learning sensor interfacing, SPI communication, and BCD display of temperature for educational and practical applications.
Parts used in the Digital Temperature Sensing using PIC16F676 with Proteus Simulation:
- PIC16F676 microcontroller
- TC72 digital temperature sensor (PICtail™)
- Resistors (current limiting and pull-ups)
- LEDs for BCD temperature display
- Push switch (control/input)
- PICKIT™ FLASH Starter Kit interface (simulation reference)
Introduction
This microcontroller project demonstrates digital temperature sensing using the TC72 PICtail™ temperature sensor interfaced with a PIC16F676 microcontroller. Based on Application Note AN940, the project shows how accurate temperature data can be acquired digitally and processed inside a PIC MCU.
Designed for Proteus simulation, this project is ideal for learning embedded systems, sensor interfacing, and SPI communication in practical electronics.
It also highlights how temperature values can be displayed in BCD format, making the design suitable for educational and real-world applications.
How the Project Works (Overview)
The system uses the TC72 digital temperature sensor to measure ambient temperature and transmit the data to the PIC16F676 via a synchronous serial interface.
The microcontroller reads the temperature value, processes it internally, and outputs the result in Binary Coded Decimal (BCD) form.
Discrete outputs represent the tens and units of the measured temperature, allowing the value to be visualized using LEDs during simulation.
Block Diagram / Workflow Explanation
TC72 Temperature Sensor measures ambient temperature digitally
Serial communication lines (CLK, SDI, SDO, CE) transfer data to the PIC
PIC16F676 MCU receives and processes the temperature value
Temperature is converted into BCD format
Output pins drive LED indicators representing temperature digits
This workflow closely follows the structure described in AN940 and is fully observable in the Proteus simulation environment.
Key Features
Digital temperature sensing using TC72 PICtail™
PIC16F676-based embedded system
SPI-style serial communication
Temperature displayed in BCD format
Designed for Proteus VSM simulation
Application-note-based reference design (AN940)
Clear separation of sensor input and display output
Components Used
PIC16F676 microcontroller
TC72 digital temperature sensor (PICtail™)
Resistors (current limiting and pull-ups)
LEDs for BCD temperature display
Push switch (control/input)
PICKIT™ FLASH Starter Kit interface (simulation reference)
Applications
Digital thermometer systems
Embedded temperature monitoring
Educational PIC microcontroller projects
Sensor interfacing tutorials
Industrial or appliance temperature indication
DIY electronics learning platforms
Explanation of the Code (High-Level)
The firmware is written in MPASM and targets the PIC16F676.
At a high level, the code:
Initializes I/O pins and serial communication lines
Communicates with the TC72 sensor to read temperature data
Converts the received value into BCD format
Drives output pins connected to LEDs to represent tens and units
The logic follows Microchip’s AN940 application note, making it easy to understand and extend.
Source Code
; Filename: TC72 PICtail.asm
; Date: January 26, 2004
; File Version: 0.1
; Assembled using: MPLAB IDE v6.50
;
; Author: Steven Bible
; Company: Microchip Technology Inc.Proteus Simulation
In Proteus VSM, the TC72 sensor communicates with the PIC16F676 exactly as it would in hardware.
As the simulated temperature changes, the microcontroller updates its outputs, and the LEDs display the temperature in BCD format.
This makes the project especially useful for debugging, learning firmware behavior, and understanding sensor-to-MCU interaction without physical hardware.
(FAQs)
Conclusion
This Digital Temperature Sensing using PIC16F676 with Proteus Simulation project is a clean, practical example of real-world embedded systems design.
By combining a digital sensor, a PIC microcontroller, and simulation-friendly hardware, it provides strong learning value for anyone exploring microcontroller projects, firmware development, and DIY electronics.
It’s a solid foundation for expanding into more advanced temperature monitoring systems.
- Can this project be fully simulated in Proteus?
Yes, it is designed specifically for Proteus simulation using VSM components. - Why use a digital temperature sensor instead of analog?
Digital sensors like the TC72 offer better accuracy and eliminate ADC calibration issues. - Is PIC16F676 mandatory for this project?
This implementation targets the PIC16F676, as referenced in AN940. - How is temperature displayed in this project?
Temperature is converted into BCD format and shown using LEDs. - Can the display be replaced with an LCD or 7-segment display?
Yes, the BCD outputs can be adapted for other display modules. - What communication protocol is used with the TC72?
The TC72 uses a serial interface similar to SPI. - Is this suitable for beginners in embedded systems?
Yes, it is an excellent learning project for PIC microcontrollers and sensor interfacing.
