Guide for hardware connection for 8 Relays expansion. The 8 Relays Expansion module is based on IC PCF8574. ESPHome component allows you to use PCF8574 or PCF8575 I/O expanders. It uses I²C Bus for communication. Once configured, you can use any of the 8 relays for your projects. Configuration variables: Pin configuration variables:
Follow these steps: Connect relays expanders to the controller and set up the I2C address. Reset controller. Follow this hardware connecting instruction: ESP32R4 Relays Expander. Hardware Guide
This guide will help you connect and configure the relay expander to the ESP32R4 controller. The relay expander increases the number of relays controlled by the ESP32R4 controller. Can connect up to 12 expanders with 8 relays each. Hardware: Power supply select: I2C address selection： For each I2C device, you need to select a UNIQUE address. Use…