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Rs 232 relay control board using pic16f84aPowering up my 16ch 5v relay shield 5v 24v 16channel shield16 channel relay module.
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5V Single-Channel Relay Module - Pin Diagram, Specifications
Powering up my 16ch 5v Relay shield - Project Guidance - Arduino Forum
8 Channel RS485 Relay Board - Electronics-Lab.com
Rs 232 Relay Control Board using PIC16F84A
16 Channel Relay Module 5v,12v,24v 16channel Relay Output 16-channel 16
4-channel-large-current-relay-board-schematic - Electronics-Lab.com
Wiring Bluetooth HC06 in 8 Channel Relay with Android & Arduino
16 Channel Relay Module - Digitalelectronics
Relay 16 channel - HUB360