MPL3115A2 & Library | Arduino Code & Datasheet

Altitude – Barometer Senzor – MPL3115A2

Mpl3115a2

If you’re looking for a reliable pressure sensor, the MPL3115A2 might be exactly what you need. It covers a pressure range of 20 to 110 kPa, with an impressive resolution of 1 Pa, which makes it perfect for precise measurements. It can measure temperatures from -40°C to 85°C and provides output through either I2C or SPI, depending on your preference.

One of the standout features is its low power consumption—only about 3.3 µA—making it a great choice for battery-powered devices. The pressure accuracy is within ±0.5 hPa, and the temperature accuracy is ±1°C, ensuring you get reliable data. Whether you’re using it for weather monitoring, altimeters, or other applications, this sensor offers high precision and integrates both pressure and temperature sensors in a compact package. Plus, it’s easy to work with, thanks to its small QFN form factor.

Mpl3115a2 Pinout

When working with the MPL3115A2, make sure you provide a stable power connection. VDD should be connected to a power source within the range of 1.95V to 3.6V, and GND should go to ground.

For I2C communication, connect SCL to the clock line and SDA to the data line. If you’re using SPI, SCL goes to the SPI clock (SCK), and SDA should be connected to the MOSI pin of your SPI master.

The INT and DRDY pins are used for interrupt and data-ready signals, making them ideal for real-time monitoring. When using SPI, CS helps select the device, and ADDR is used to configure the I2C address in I2C mode.

Just make sure you connect the pins properly to avoid any conflicts or voltage mismatches. This will ensure smooth operation and prevent any issues down the line.

Mpl3115a2 Equivalent Sensor

When looking for a replacement for the MPL3115A2, the LPS22HB is a solid option. It offers similar temperature and pressure ranges, but with better pressure accuracy (±0.1 hPa). However, keep in mind that it only supports I2C, whereas the MPL3115A2 offers both I2C and SPI.

Another choice is the BMP180, which is a low-power sensor with high resolution and accuracy, making it perfect for applications sensitive to pressure and temperature changes. The downside is that it only supports I2C, and its pressure range is a bit narrower than the MPL3115A2.

If precision is your top priority, the MS5611 is a great option. It’s designed for high-precision pressure measurements, particularly in environments with large pressure variations. It consumes less power than the MPL3115A2, but keep in mind it only supports I2C communication.

Just make sure the replacement matches your project’s specific needs in terms of power, communication interface, and measurement range.

Mpl3115a2 Barometric Pressure Sensor Circuit

When you’re setting up the MPL3115A2, make sure to pay attention to the power supply. VDD (Pin 1) is where you’ll connect the positive voltage, usually between 1.95V and 3.6V. To keep the power stable, it’s a good idea to add two decoupling capacitors: a 100nF for high-frequency noise and a 10µF for smoothing out low-frequency fluctuations.

GND (Pin 2) is the ground pin, which you’ll connect to the system’s ground. VDDIO (Pin 4) powers the sensor’s logic, typically connected to the same voltage as VDD to keep things consistent.

For communication, SCL (Pin 8) and SDA (Pin 7) are your I2C lines. SCL is the clock signal, and SDA carries the data. Don’t forget the interrupt pins (INT1 and INT2) on Pins 5 and 6; they let you know when the sensor is ready with new data.

Lastly, ensure you have good decoupling to reduce power noise and keep everything running smoothly!

Mpl3115a2 Arduino Wiring Example

In this wiring setup, you’re connecting the MPL3115A2 barometric pressure sensor to an Arduino (with an Ethernet shield). Here’s how the connections work:

• VDD (Pin 1) goes to the 5V pin on the Arduino to power up the sensor.

• GND (Pin 2) is connected to GND on the Arduino, completing the circuit.

• SCL (Pin 8) connects to the SCL pin on the Arduino. On older boards, this is A5, but newer boards may have a dedicated SCL pin.

• SDA (Pin 7) connects to the SDA pin on the Arduino. On older boards, it’s A4, but newer ones might have a dedicated SDA pin.

The INT1 and INT2 pins are not connected here, as they’re optional depending on whether you need interrupt functionality for your project.

Once everything is hooked up, make sure you have the right I2C library in the Arduino IDE to start reading pressure and temperature data from the sensor.

Mpl3115a2 With Esp32 Tutorial

To get your MPL3115A2 barometric pressure sensor working with the ESP32, it’s pretty straightforward. First, you’ll connect the VDD of the sensor to the 5V on the ESP32 for power, and the GND to ground. For communication, hook up the SCL pin from the sensor to GPIO 22 (the SCL pin on the ESP32) and SDA to GPIO 21 (the SDA pin). The INT1 and INT2 pins aren’t necessary for basic readings, so you can leave those disconnected unless you want to use interrupts.

Once you’ve got everything wired up, you’ll need to set up the Arduino IDE to work with the ESP32. Install the ESP32 board package, then the MPL3115A2 library. After that, upload the code to your ESP32, and open the Serial Monitor to see real-time pressure and temperature readings coming from your sensor.

If you run into issues with I2C communication, double-check the wiring and make sure you’re using the correct pins for SDA and SCL on your ESP32.