Wiring the PCF8574AP 8bit Bidirectional IO Expander Driven i2C Communication Bus / SPI

This is the PCF8574AP consists of an 8-bit quasi-bidirectional port and an i2C Serial Bus Interface. The PCF8574AP has a low current consumption and includes latched output with HIGH consumption and include latched output with high current drive capability for

Wiring 8 Channel Optocoupler Relay Module

In this tutorial we will going to wire the 8 channel Relay Module driven by our own very owned microcontroller, the below illustration illustrate 8 device on external power source triggered by the relay. The 8 channel relay module has