Summary of PID Controlled Oven using TMS320F28027PT with Proteus Simulation
This project implements a PID-controlled oven using a TMS320F28027PT PICCOLO microcontroller, thermocouple sensing with cold-junction compensation, op-amp signal conditioning, and Proteus simulation to verify closed-loop temperature control, timing, and watchdog management. It demonstrates ADC-based feedback, firmware delay routines, and safe startup for learning PID control and embedded systems without physical hardware.
Parts used in the PID Controlled Oven using TMS320F28027PT with Proteus Simulation:
- TMS320F28027PT (PICCOLO MCU)
- Thermocouple (TC1)
- Cold Junction Compensation circuitry
- Operational Amplifier (OPAMP) for signal conditioning
- ADC input of TMS320F28027PT (as part of MCU)
- Heater / Oven block (OV1)
- Push button switch
- Pull-down resistor
- Power supply (+3.3V)
- Proteus virtual instruments / simulation environment
Introduction
This project demonstrates a PID controlled oven implemented using a PICCOLO TMS320F28027PT microcontroller and verified through Proteus simulation.
It is a practical microcontroller project focused on temperature control, widely used in embedded systems and industrial electronics.
The system reads temperature feedback from a thermocouple, processes it digitally, and regulates heating accurately.
By simulating the full setup in Proteus, the project becomes easy to test, tune, and understand without physical hardware.
This makes it ideal for learning PID control, practical electronics, and firmware behavior in closed-loop systems.
How the Project Works (Overview)
The oven’s temperature is monitored using a thermocouple connected through signal conditioning circuitry.
The conditioned signal is fed into the ADC of the TMS320F28027PT, where the control algorithm processes it.
A PID control strategy determines how much heating is required to reach and maintain the target temperature.
Based on this calculation, the controller adjusts the heater operation, ensuring stable and accurate temperature control.
Block Diagram / Workflow Explanation
Thermocouple (TC1) senses oven temperature
Cold Junction Compensation (CJ) corrects measurement offset
Op-Amp Signal Conditioning amplifies the thermocouple voltage
ADC of TMS320F28027PT converts analog signal to digital
PID Control Logic (Firmware) calculates control output
Heater (OV1) adjusts temperature based on control signal
This closed-loop workflow continuously maintains the desired oven temperature.
Key Features
Closed-loop PID temperature control
Thermocouple-based temperature sensing
Cold junction compensation for accuracy
ADC-based feedback using PICCOLO MCU
Fully simulated Proteus environment
Assembly-level timing control using delay routines
Watchdog management for stable startup
Components Used
TMS320F28027PT (PICCOLO MCU)
Thermocouple (TC1)
Operational Amplifier (OPAMP)
Heater / Oven block
Push button switch
Pull-down resistor
Power supply (+3.3V)
Proteus virtual instruments
Applications
Industrial temperature-controlled ovens
Embedded heating systems
PID controller learning platforms
Process control training setups
Embedded systems and control labs
DIY electronics temperature regulation projects
Explanation of Code (High-Level)
The provided firmware focuses on system startup, timing accuracy, and safe execution flow:
Delay Routine (
DSP28x_usDelay)
Implements a precise software delay using CPU cycle counting. This ensures accurate timing when required by control algorithms.Code Start & Boot Handling
Redirects execution after reset and safely disables the watchdog timer before entering the main program.Watchdog Control
The watchdog is explicitly disabled during startup to avoid unintended resets during simulation or debugging.
This low-level setup is critical for predictable behavior in real-time embedded systems.
Source Code
.if WD_DISABLE == 1
.text
wd_disable:
SETC OBJMODE ;Set OBJMODE for 28x object code
EALLOW ;Enable EALLOW protected register access
MOVZ DP, #7029h>>6 ;Set data page for WDCR register
MOV @7029h, #0068h ;Set WDDIS bit in WDCR to disable WD
EDIS ;Disable EALLOW protected register access
LB _c_int00 ;Branch to start of boot.asm in RTS library
.endif
;end wd_disableProteus Simulation
In Proteus, the thermocouple generates a millivolt-level signal corresponding to oven temperature.
The op-amp conditions this signal before feeding it into the ADC pins of the PICCOLO MCU.
As temperature changes, the simulated firmware processes feedback and stabilizes the oven temperature.
This allows safe testing of control behavior, startup logic, and timing without real hardware.
(FAQs)
Conclusion
This PID controlled oven project is a strong example of real-world embedded systems design using the TMS320F28027PT.
It combines control theory, firmware timing, and analog signal processing in a clean Proteus simulation.
The project offers excellent learning value for anyone exploring microcontroller projects, PID control, and DIY electronics with professional-grade tools.
- Can this project run fully in Proteus?
Yes, the complete system is designed and tested using Proteus simulation. - Why is cold junction compensation used?
It improves thermocouple accuracy by compensating for reference temperature errors. - Can the PID parameters be modified?
Yes, PID tuning values can be adjusted in firmware for different response behaviors. - Is this project suitable for beginners?
It is best suited for users with basic knowledge of embedded systems and control theory. - Why is the watchdog disabled?
To prevent unwanted resets during startup and debugging in simulation. - Can this be implemented on real hardware?
Yes, the schematic and firmware structure support real-world deployment. - Does the delay routine affect control accuracy?
Accurate delays help maintain predictable control loop timing. - Can other temperature sensors be used?
Yes, with appropriate signal conditioning and ADC scaling.
