This project demonstrates how to interface the MPX4250AP pressure sensor with an STM32F103C6 microcontroller using its ADC, display pressure values on an LCD, and transmit data via UART. A complete Proteus simulation is included for testing and validation.
The MPX4250AP is a precision pressure sensor designed primarily for intake manifold absolute pressure sensing in engine control systems. Built with piezoresistive transducer technology and patented silicon shear stress strain gauge, it provides high accuracy and reliability. The sensor is engineered to operate across extreme temperatures from -40°C to +125°C with a maximum error rate of just 1.5%, making it well-suited for automotive and industrial applications.
Typical Applications
- Turbo Boost Engine Control – Enables precise regulation of turbocharger boost pressure for optimized performance.
- On-Chip Temperature Compensation – Provides stable measurements across wide temperature ranges.
- Microprocessor-Based Systems – Simple integration with STM32 ADC for real-time monitoring.
- MCU Selection: STM32F103C6 (8 MHz clock)
- ADC1 Configuration:
-Channel IN2 (PA2),-Continuous Conversion Mode-12-bit resolution-1.5 cycles sampling time
- GPIO Configuration:
-PB3–PB9 as outputs (LCD control)
- UART1 Configuration:
-115200 baud-8-bit data-no parity
- Generate initialization code and open the project in STM32CubeIDE.
Key Functions:
- Pressure Calculation:
-float pressure_kPa = (adc_value * 5.0 / 4095 * 50.8) + 0.25; // MPX4250AP transfer function
- LCD Output:
-lcd.setCursor(0,1);-lcd.print(pressure_kPa);-lcd.print(" kPa");
- UART Transmission:
Components:
- STM32F103C6
- MPX4250AP Sensor
- LCD2004 Display
- Virtual Terminal
Connections:
- Sensor output → PA2 (ADC input)
- LCD → PB3–PB9 (control lines)
- UART1-TX (PA9) → Virtual Terminal RX
Simulation:
- Load the generated.hex file
- Observe real-time pressure values on the LCD and terminal
If you have any questions or suggestions don't hesitate to leave a comment below
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