Use a Different I2C Library

Oct 13, 2025 by talynt.org 65 views

Introduction

Connecting a BMP390L pressure sensor to an ESP32-S3 board via I2C can be a straightforward process, but sometimes issues may arise. In this article, we will explore the problem of the BMP390L not being detected on the ESP32-S3 via I2C using the CJMCU-390 board. We will go through the steps to troubleshoot and resolve this issue.

Understanding the CJMCU-390 Board

The CJMCU-390 board is a popular module that integrates the BMP390L pressure sensor with an I2C interface. It is a compact and easy-to-use module that can be connected to various microcontrollers, including the ESP32-S3. The CJMCU-390 board has a simple pinout, making it easy to connect to the ESP32-S3.

ESP32-S3 and I2C Communication

The ESP32-S3 has a built-in I2C peripheral that can be used to communicate with I2C devices like the BMP390L. The I2C peripheral on the ESP32-S3 is a master device that can initiate communication with I2C slave devices like the BMP390L. The I2C communication protocol uses a clock signal (SCL) and a data signal (SDA) to transfer data between devices.

Troubleshooting Steps

If the BMP390L is not detected on the ESP32-S3 via I2C, there are several troubleshooting steps that can be taken:

1. Check the I2C Connection

Verify that the I2C pins on the ESP32-S3 are connected to the corresponding pins on the CJMCU-390 board.
Make sure that the I2C pins are not shorted or connected to any other pins on the board.

2. Check the I2C Address

The BMP390L has a default I2C address of 0x77. Verify that the I2C address is set correctly on the ESP32-S3.
If the I2C address is set to a different value, try changing it to the default value.

3. Check the I2C Speed

The I2C speed on the ESP32-S3 is set to 100 kHz by default. Verify that the I2C speed is set correctly on the ESP32-S3.
If the I2C speed is set to a different value, try changing it to the default value.

4. Check the I2C Pins

Verify that the I2C pins on the ESP32-S3 are not connected to any other pins on the board.
Make sure that the I2C pins are not shorted or connected to any other pins on the board.

5. Check the CJMCU-390 Board

Verify that the CJMCU-390 board is functioning correctly.
Try connecting the CJMCU-390 board to a different microcontroller to rule out any issues with the board.

6. Check the ESP32-S3 Code

Verify that the ESP32-S3 code is correct and that the I2C communication is properly implemented.
Try modifying the ESP32-S3 code to use a different I2C address or speed.

Resolving the Issue

After troubleshooting the issue, if the BMP390L is still not detected on the ESP32-S3 via I2C, there are several possible solutions:

1. Reset the ESP32-S3

Try resetting the ESP32-S3 to its default settings.
This may resolve any issues with the I2C communication.

2. Update the ESP32-S3 Firmware

Try updating the ESP32-S3 firmware to the latest version.
This may resolve any issues with the I2C communication.

3. Use a Different I2C Library

Try using a different I2C library on the ESP32-S3.
This may resolve any issues with the I2C communication.

4. Use a Different I2C Address

Try using a different I2C address on the ESP32-S3.
This may resolve any issues with the I2C communication.

Conclusion

In conclusion, the issue of the BMP390L not being detected on the ESP32-S3 via I2C can be resolved by following the troubleshooting steps outlined in this article. By checking the I2C connection, I2C address, I2C speed, I2C pins, CJMCU-390 board, and ESP32-S3 code, you can identify and resolve the issue. If the issue persists, try resetting the ESP32-S3, updating the ESP32-S3 firmware, using a different I2C library, or using a different I2C address.

Additional Resources

For more information on the ESP32-S3 and I2C communication, refer to the following resources:

Frequently Asked Questions

Q: What is the default I2C address of the BMP390L?

A: The default I2C address of the BMP390L is 0x77.

Q: What is the default I2C speed on the ESP32-S3?

A: The default I2C speed on the ESP32-S3 is 100 kHz.

Q: How do I troubleshoot I2C communication issues on the ESP32-S3?

A: To troubleshoot I2C communication issues on the ESP32-S3, follow the troubleshooting steps outlined in this article.

Q: How do I resolve I2C communication issues on the ESP32-S3?

Q: What is the BMP390L pressure sensor?

A: The BMP390L is a high-precision pressure sensor that measures pressure and temperature. It is a popular choice for various applications, including weather monitoring, industrial automation, and IoT projects.

Q: What is the CJMCU-390 board?

A: The CJMCU-390 board is a compact module that integrates the BMP390L pressure sensor with an I2C interface. It is a popular choice for projects that require a simple and easy-to-use pressure sensor module.

Q: How do I connect the CJMCU-390 board to the ESP32-S3?

A: To connect the CJMCU-390 board to the ESP32-S3, follow these steps:

Connect the I2C pins (SCL and SDA) on the ESP32-S3 to the corresponding pins on the CJMCU-390 board.
Connect the power pins (VCC and GND) on the ESP32-S3 to the corresponding pins on the CJMCU-390 board.
Make sure that the I2C pins are not shorted or connected to any other pins on the board.

Q: What is the default I2C address of the BMP390L?

A: The default I2C address of the BMP390L is 0x77.

Q: What is the default I2C speed on the ESP32-S3?

A: The default I2C speed on the ESP32-S3 is 100 kHz.

Q: How do I troubleshoot I2C communication issues on the ESP32-S3?

A: To troubleshoot I2C communication issues on the ESP32-S3, follow these steps:

Check the I2C connection: Verify that the I2C pins on the ESP32-S3 are connected to the corresponding pins on the CJMCU-390 board.
Check the I2C address: Verify that the I2C address is set correctly on the ESP32-S3.
Check the I2C speed: Verify that the I2C speed is set correctly on the ESP32-S3.
Check the I2C pins: Verify that the I2C pins on the ESP32-S3 are not shorted or connected to any other pins on the board.
Check the CJMCU-390 board: Verify that the CJMCU-390 board is functioning correctly.

Q: How do I resolve I2C communication issues on the ESP32-S3?

A: To resolve I2C communication issues on the ESP32-S3, try the following:

Reset the ESP32-S3: Try resetting the ESP32-S3 to its default settings.
Update the ESP32-S3 firmware: Try updating the ESP32-S3 firmware to the latest version.
Use a different I2C library: Try using a different I2C library on the ESP32-S3.
Use a different I2C address: Try using a different I2C address on the ESP32-S3.

Q: What are some common issues with the BMP390L pressure sensor?

A: Some common issues with the BMP390L pressure sensor include:

Incorrect I2C address: Make sure that the I2C address is set correctly on the ESP32-S3.
Incorrect I2C speed: Make sure that the I2C speed is set correctly on the ESP32-S3.
Shorted or connected I2C pins: Make sure that the I2C pins on the ESP32-S3 are not shorted or connected to any other pins on the board.
Faulty CJMCU-390 board: Make sure that the CJMCU-390 board is functioning correctly.

Q: How do I calibrate the BMP390L pressure sensor?

A: To calibrate the BMP390L pressure sensor, follow these steps:

Connect the CJMCU-390 board to the ESP32-S3.
Initialize the BMP390L pressure sensor.
Take multiple readings of the pressure sensor.
Use a calibration tool to adjust the pressure sensor readings.
Save the calibration data.

Q: What are some applications of the BMP390L pressure sensor?

A: Some applications of the BMP390L pressure sensor include:

Weather monitoring: Use the BMP390L pressure sensor to measure atmospheric pressure and temperature.
Industrial automation: Use the BMP390L pressure sensor to measure pressure and temperature in industrial applications.
IoT projects: Use the BMP390L pressure sensor to measure pressure and temperature in IoT projects.
Aerospace: Use the BMP390L pressure sensor to measure pressure and temperature in aerospace applications.

Q: Where can I purchase the CJMCU-390 board?

A: You can purchase the CJMCU-390 board from various online retailers, including AliExpress, Amazon, and eBay.

Q: What is the price of the CJMCU-390 board?

A: The price of the CJMCU-390 board varies depending on the retailer and the quantity purchased. On average, the price of the CJMCU-390 board is around $10-$20.

Q: What is the warranty of the CJMCU-390 board?

A: The warranty of the CJMCU-390 board varies depending on the retailer and the quantity purchased. On average, the warranty of the CJMCU-390 board is around 1-2 years.