Working on an ESP32 environmental monitor prototype reading temperature, pressure, and humidity via a BME280 sensor on I2C bus 0.
During startup, the master bus initialisation succeeds, but probing the sensor address (0x76) immediately hangs and throws a timeout error:
E (1392) i2c: i2c_master_cmd_begin(1435): I2C transaction timeout E (1394) bme280: Failed to read chip ID register 0xD0 (ESP_ERR_TIMEOUT) Here is the full VS Code workspace screenshot showing the I2C read implementation alongside the serial monitor crash log:
Setup details:
- Board: ESP32-WROOM-32D Development Board
- IDE: Visual Studio Code with PlatformIO (ESP-IDF framework)
- Pins: SDA configured on GPIO 21, SCL on GPIO 22
- Pull-ups: Internal pull-ups enabled via
gpio_set_pull_mode() - Clock: Standard 100 kHz bus frequency
Has anyone observed intermittent ESP_ERR_TIMEOUT on ESP-IDF when using internal pull-ups alone versus adding dedicated 4.7kΩ external resistors on SDA/SCL lines? Looking to hear hardware experiences before revising the PCB layout.
