Pressure is an expression of force exerted on a surface per unit area. We commonly measure the pressure of liquids, air, and other gases, amongst other things. The standard unit for pressure is the “Pascal”. This is equivalent to one “Newton per meter squared”. A pressure sensor simply monitors this pressure and can display it in one of the several units known around the world. This is commonly the “Pascal”, “Bar”, and “PSI” (Pounds per Square Inch) in the United States. In a nutshell, a pressure sensor converts the pressure to a small electrical signal that is transmitted and displayed. These are also commonly called pressure transmitters because of this. Two common signals that are used are “4 to 20” milliamps signal and “0 to 5” Volts signal.
Most pressure sensors work using the piezoelectric effect. This is when a material creates an electric charge in response to stress. This stress is usually pressure but can be twisting, bending, or vibrations. The pressure sensor detects the pressure and can determine the amount of pressure by measuring the electric charge. Pressure sensors need to be calibrated so it knows what voltage or milliamp (mA) signal corresponds to what pressure.
There are three common types that we use in the industry: “Gauge Pressure”, “Absolute Pressure” and “Differential pressure”.
Manifold Absolute Pressure Sensor, referred to as MAP sensor. The MAP sensor is an indirect airflow meter, and its signal is one of the important signals for the basic fuel injection control of the engine. It is connected to the intake manifold with a vacuum tube. With different engine speed loads, it senses the vacuum change in the intake manifold and then converts the change in the internal resistance of the sensor into a voltage signal for the ECU to correct the fuel injection volume.
An overview of the KP229L2920 sensor
The manifold air pressure (Turbo MAP) is an important parameter to compute the air-fuel ratio provided to the engine for lower emission due to better combustion and increased efficiency. For cost sensitive engine systems a MAP sensor shows the potential to complement or even substitute mass air flow (MAF) sensors. In addition manifold pressure data can be used to compute diagnostics of leakages and malfunctions of the exhaust gas recirculation valve. In automotive applications where high production volumes are common there is substantial interest in precision, low-cost and fully integrated sensors. In this context products of the developed MAP sensor family KP22x are the optimum solution for aspirated or turbo diesel and gasoline engines management systems.
- Engine control/Turbo MAP applications
- Industrial controls
KP229L2920 module Key Features
- On Board, ON/OFF LED indicator
- GEBRABIT Pin Compatible with GEBRABUS
- It can be used as a daughter board of GEBRABIT MCU Modules
- Featuring Castellated pad (Assembled as SMD Part)
- Separatable screw parts to reduce the size of the board
- Package: GebraBit small (36.29mm x 32.72mm)
GebraBit KP229L2920 module
GebraBit KP229L2920 is an Analog Manifold Air Pressure/Turbo Map Integrated Pressure module.
GebraBit KP229L2920 module operates with “5V” supply Voltage.
GEBRABIT KP229L2920 module has an analog output with a circuit that acts as a low-pass decoupling filter between the sensor IC output and AO of the module.
Users need a starter circuit and driver for hardware development and of course software development of the KP229L2920 sensor. GebraBit has done this by implementing the KP229L2920 sensor circuit and provided access to its analog output for users.
It is enough to put the GebraBit KP229L2920 module in the BreadBoard, then by applying the proper voltage set up the GebraBit KP229L2920 module with any of Arduino, Raspberry Pi, Discovery board, and especially we recommend using GebraBit microcontroller development modules (GebraBit STM32F303 or GebraBit ATMEGA32 module) then receive the data.
The reason for our recommendation when setting up the GebraBit KP229L2920 module with GebraBit microcontroller development modules (such as GebraBit STM32F303 or GebraBit ATMEGA32), is the compatibility of the pin order of all GebraBit modules together (GEBRABUS standard), it’s enough to Put the KP229L2920 in the corresponding socket as shown in the above picture and develop the desired sensor module without the need for wiring.
Introduction of module sections
The KP229L2920 sensor is the pressure sensor of this module which is placed in the center of the module and its circuit is designed.
By applying voltage to the module through the corresponding pin, this LED is lit.
GebraBit KP229L2920 Module pins
- 5V: This pin supplies the sensor main power supply.
- GND: This is the ground pin for powering the sensor.
Analog output pin
AO: The output data of the sensor will be available in the form of analog voltage through this pin and the output of this pin will change depending on the pressure change.
Connect to the processor
Connection with GebraBit STM32F303
Due to the compatibility of the pin order of GebraBit modules with each other (GEBRABUS standard), to start the GebraBit KP229L2920 module with GebraBit STM32F303 microcontroller module, it is enough to easily place the GebraBit KP229L2920 module as pin to pin on the GebraBit STM32F303 module and start the module by applying voltage. Here, for better understanding, the separate connection of these two modules is shown:
Connection with GebraBit ATMEGA32A
Due to the compatibility of the pin order of GebraBit modules with each other (GEBRABUS standard), to start the GebraBit KP229L2920 module with the GebraBit ATMEGA32A microcontroller module, it is enough to easily place the GebraBit KP229L2920 module as pin to pin on the GebraBit ATMEGA32A module and start the module by applying voltage. Here, for better understanding, the separate connection of these two modules is shown:
Connection with ARDUINO UNO
- Connect the “5V” pin of the KP229L2920 module to the “5V” pin of the ARDUINO UNO board output (red wire).
- Connect the “GND” pin of the KP229L2920 module to the “GND” pin of the ARDUINO UNO board. (Black wire)
- Connect the “AO” pin of the KP229L2920 module to one of the ARDUINO UNO board analog pins (orange wire).
How to connect the above mentioned steps can be seen in this picture: