GPIO Expander (Micro Relays) (Wi-Fi & Bluetooth)

Hardware

The IMU Board is powered by the Espressif ESP32-WROOM-32E module, featuring two 32-bit LX6 Xtensa MCUs. This versatile module supports Wi-Fi (802.11 b/g/n), Bluetooth Classic, and Bluetooth Low Energy (BLE), enabling a wide range of applications, including:

• IoT devices
• AI/ML edge computing
• Low-power sensor networks
• Audio streaming
• General control systems

Key features include:

• Rich peripheral set: SPI, I2C, I2S, ADC, UART
• 4 MB flash memory for program storage
• Integrated 3-axis gyroscope and 3-axis accelerometer with temperature sensing
• Standard 0.1” header spacing for easy bread board prototyping

Capabilities

GPIO Expander

The board integrates the TCA9539A 16-bit I/O expander, providing additional general-purpose digital I/O via the I2C bus (or SMBus protocol).
Highlights:

• 16-bit parallel I/O expansion
• Supports I2C Standard mode (100 kHz) and Fast mode (400 kHz)
• Interrupt (INT) pin triggers when input ports change state
• RESET pin for hardware reset to default state
• Suitable for switches, sensors, push-buttons, LEDs, fans, and more

Wireless Connectivity

• Wi-Fi: 802.11 b/g/n, data rates up to 150 Mbps
• Bluetooth: Classic + BLE for low-energy applications

Software Compatibility

The IMU Board is designed for flexible development, supporting:

• Arduino framework – Arduino Store
• MicroPython (with Thonny IDE) – Thonny.org
• Example code available on GitHub: OBS-DEV-ENG