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54. Reassembled two channel Relay module for Arduino

Hello everyone!
Today I am going to explain you about my reassembled two channel Relay module which is compatible with Arduino. I bought two low level trigger relay modules for my IoT project and, unfortunately, they did not connect with my IoT system. I faced many troubled because of this, and I looked this up on the internet. I tried several solutions but they were in vain; I decided to convert my low level trigger relay modules into high level trigger relay modules by substituting the PNP transistor with NPN BC547 transistor.
This two channel 5V relay module has 4 pins. It shares a common ground (GND) pin and a common VCC pin. The other two pins are the signal pins for both relays. 
If anyone has any questions with this, please feel free to comment below or send me an email at arduinoprojectsbyr@gmail.com.

Hardware components used in this project


  • 5V relay (x2)
  • Terminal block (x2)
  • BC547 transistors (x2)
  • Resistor (x4) - 1 kΩ (two for each channel)
  • LED (x2) - Red
  • Pin header (4 pins) - Male
  • PCB prototype board

Tools required for this project

  • Solder
  • Soldering station
  • Desoldering pump



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