Possible Causes of the BMP390L Not Being Detected

Oct 13, 2025 by wbrum.org 76 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 discuss the possible causes and solutions to this issue, providing a step-by-step guide to help you troubleshoot and resolve the problem.

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 a variety of microcontrollers, including the ESP32-S3. The CJMCU-390 board has a simple pinout, making it easy to connect to the ESP32-S3 board.

Possible Causes of the BMP390L Not Being Detected

There are several possible causes for the BMP390L not being detected on the ESP32-S3 via I2C. Some of the most common causes include:

Incorrect I2C Address: The BMP390L has a default I2C address of 0x77, but this can be changed using the device's register settings. If the I2C address is not set correctly, the ESP32-S3 may not be able to detect the BMP390L.
I2C Bus Issues: The I2C bus can be prone to issues such as noise, interference, or signal degradation. This can cause the ESP32-S3 to fail to detect the BMP390L.
BMP390L Register Settings: The BMP390L has several registers that need to be set correctly for it to function properly. If these registers are not set correctly, the ESP32-S3 may not be able to detect the BMP390L.
ESP32-S3 I2C Driver Issues: The ESP32-S3 has a built-in I2C driver that may not be compatible with the BMP390L. This can cause the ESP32-S3 to fail to detect the BMP390L.

Troubleshooting Steps

To troubleshoot the issue of the BMP390L not being detected on the ESP32-S3 via I2C, follow these steps:

Step 1: Check the I2C Address

Verify that the I2C address of the BMP390L is set correctly. You can do this by checking the device's register settings or by using a tool such as the I2C Scanner.
If the I2C address is not set correctly, change it to the default address of 0x77.

Step 2: Check the I2C Bus

Verify that the I2C bus is functioning correctly. You can do this by checking the I2C bus for any signs of noise, interference, or signal degradation.
If the I2C bus is not functioning correctly, try to isolate the issue by using a different I2C bus or by adding a pull-up resistor to the I2C bus.

Step 3: Check the BMP390L Register Settings

Verify that the BMP390L register settings are set correctly. You can do this by checking the device's register settings or by using a tool such as the I2C Scanner.
If the register settings are not set correctly, change them to the default settings.

Step 4: Check the ESP32-S3 I2C Driver

Verify that the ESP32-S3 I2C driver is compatible with the BMP390L. You can do this by checking the ESP32-S3 documentation or by using a tool such as the I2C Scanner.
If the I2C driver is not compatible, try to use a different I2C driver or update the ESP32-S3 firmware to the latest version.

Conclusion

In conclusion, the issue of the BMP390L not being detected on the ESP32-S3 via I2C can be caused by a variety of factors, including incorrect I2C address, I2C bus issues, BMP390L register settings, and ESP32-S3 I2C driver issues. By following the troubleshooting steps outlined in this article, you should be able to identify and resolve the issue.

Additional Resources

Code Examples

Here are some code examples that demonstrate how to connect the BMP390L to the ESP32-S3 via I2C:

Example 1: Connecting the BMP390L to the ESP32-S3 via I2C

#include <Wire.h>
void setup() {
Wire.begin();
Wire.beginTransmission(0x77); // Set the I2C address to 0x77
Wire.write(0x00); // Set the register to 0x00
Wire.endTransmission();
}
void loop() {
Wire.beginTransmission(0x77); // Set the I2C address to 0x77
Wire.write(0x00); // Set the register to 0x00
Wire.endTransmission();
delay(1000);
}

Example 2: Reading the BMP390L Pressure Sensor Data

#include <Wire.h>
void setup() {
Wire.begin();
Wire.beginTransmission(0x77); // Set the I2C address to 0x77
Wire.write(0x00); // Set the register to 0x00
Wire.endTransmission();
}
void loop() {
Wire.beginTransmission(0x77); // Set the I2C address to 0x77
Wire.write(0x00); // Set the register to 0x00
Wire.endTransmission();
Wire.requestFrom(0x77, 2); // Request 2 bytes from the BMP390L
int16_t pressure = Wire.read() << 8 | Wire.read();
Serial.println(pressure);
delay(1000);
}

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

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

Q: How do I change the I2C address of the BMP390L?

A: You can change the I2C address of the BMP390L by setting the register to a different value. The I2C address can be changed using the device's register settings or by using a tool such as the I2C Scanner.

Q: What is the purpose of the I2C bus?

A: The I2C bus is a communication protocol that allows devices to communicate with each other. It is used to transfer data between devices, such as the ESP32-S3 and the BMP390L.

Q: What are some common issues that can cause the BMP390L not to be detected on the ESP32-S3 via I2C?

A: Some common issues that can cause the BMP390L not to be detected on the ESP32-S3 via I2C include:

Incorrect I2C address
I2C bus issues
BMP390L register settings
ESP32-S3 I2C driver issues

Q: How do I troubleshoot the issue of the BMP390L not being detected on the ESP32-S3 via I2C?

A: To troubleshoot the issue of the BMP390L not being detected on the ESP32-S3 via I2C, follow these steps:

Check the I2C address of the BMP390L
Check the I2C bus for any signs of noise, interference, or signal degradation
Check the BMP390L register settings
Check the ESP32-S3 I2C driver

Q: What are some code examples that demonstrate how to connect the BMP390L to the ESP32-S3 via I2C?

A: Here are some code examples that demonstrate how to connect the BMP390L to the ESP32-S3 via I2C:

Example 1: Connecting the BMP390L to the ESP32-S3 via I2C

#include <Wire.h>
void setup() {
Wire.begin();
Wire.beginTransmission(0x77); // Set the I2C address to 0x77
Wire.write(0x00); // Set the register to 0x00
Wire.endTransmission();
}
void loop() {
Wire.beginTransmission(0x77); // Set the I2C address to 0x77
Wire.write(0x00); // Set the register to 0x00
Wire.endTransmission();
delay(1000);
}

Example 2: Reading the BMP390L Pressure Sensor Data

#include <Wire.h>
void setup() {
Wire.begin();
Wire.beginTransmission(0x77); // Set the I2C address to 0x77
Wire.write(0x00); // Set the register to 0x00
Wire.endTransmission();
}
void loop() {
Wire.beginTransmission(0x77); // Set the I2C address to 0x77
Wire.write(0x00); // Set the register to 0x00
Wire.endTransmission();
Wire.requestFrom(0x77, 2); // Request 2 bytes from the BMP390L
int16_t pressure = Wire.read() << 8 | Wire.read();
Serial.println(pressure);
delay(1000);
}

Q: What are some additional resources that can help me troubleshoot the issue of the BMP390L not being detected on the ESP32-S3 via I2C?

A: Some additional resources that can help you troubleshoot the issue of the BMP390L not being detected on the ESP32-S3 via I2C include:

Q: What are some common mistakes that can cause the BMP390L not to be detected on the ESP32-S3 via I2C?

A: Some common mistakes that can cause the BMP390L not to be detected on the ESP32-S3 via I2C include:

Incorrect I2C address
I2C bus issues
BMP390L register settings
ESP32-S3 I2C driver issues

Q: How do I update the ESP32-S3 firmware to the latest version?

A: To update the ESP32-S3 firmware to the latest version, follow these steps:

Download the latest ESP32-S3 firmware from the official website
Connect the ESP32-S3 to a computer using a USB cable
Open the ESP32-S3 firmware update tool
Select the latest firmware version and click "Update"

Q: What are some best practices for troubleshooting the issue of the BMP390L not being detected on the ESP32-S3 via I2C?

A: Some best practices for troubleshooting the issue of the BMP390L not being detected on the ESP32-S3 via I2C include:

Check the I2C address of the BMP390L
Check the I2C bus for any signs of noise, interference, or signal degradation
Check the BMP390L register settings
Check the ESP32-S3 I2C driver
Use a tool such as the I2C Scanner to troubleshoot the issue

Q: What are some common issues that can cause the BMP390L not to be detected on the ESP32-S3 via I2C in a production environment?

A: Some common issues that can cause the BMP390L not to be detected on the ESP32-S3 via I2C in a production environment include:

Incorrect I2C address
I2C bus issues
BMP390L register settings
ESP32-S3 I2C driver issues

Q: How do I prevent the issue of the BMP390L not being detected on the ESP32-S3 via I2C in a production environment?

A: To prevent the issue of the BMP390L not being detected on the ESP32-S3 via I2C in a production environment, follow these best practices:

Check the I2C address of the BMP390L
Check the I2C bus for any signs of noise, interference, or signal degradation
Check the BMP390L register settings
Check the ESP32-S3 I2C driver
Use a tool such as the I2C Scanner to troubleshoot the issue

Q: What are some additional resources that can help me prevent the issue of the BMP390L not being detected on the ESP32-S3 via I2C in a production environment?

A: Some additional resources that can help you prevent the issue of the BMP390L not being detected on the ESP32-S3 via I2C in a production environment include: