This is a 5V 4-channel replay interface board, be able to control various appliance, and other equipments with large current. It can be controlled directly by Microcontroller (Arduino,8051,AVR,PIC,DSP,ARM,MSP430,TTL logic)
L298 motor driver is ideal for robotic applications and well suited for connection to a micro-controller requiring just a couple of control lines per motor. It can also be interfaced with simple manual switches, TTL logic gates, relays, etc.
Level conversion circuit: Micro SD card into the direction of signals into 3.3V, MicroSD card toward the direction of the control interface MISO signal is also converted to 3.3V, general AVR microcontroller system can read the signal
A demultiplexer (or demux) is a device that takes a single input line and routes it to one of several digital output lines. The HCF4051 is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology available in DIP and SOP packages
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