NodeMCU with 4 Channel Module
This PCB consists of a NodeMCU with 4 Channel Relay.
The relay module is an electrical switch. It isolates the input side from the output side. When it reads input, it uses an electromagnet to turn the switch on or off.
Its output side has three pins – COM(Power Supply), NC(Normally Closed), NO(Normally Open).
NO, and NC has the load (in this case an LED is being used).
If I give a high input through the input side, NO pin will go LOW and NC pin will go HIGH. Due to its isolation, the output side and input side must be two different circuits. I used two different power supplies for the input (Including NodeMCU) and output sides(COM, NC, NO).
In this PCB, the 5V relay module is combined with NodeMCU.
D6: RELAY 1
D5: RELAY 2
D3: RELAY 3
D2: RELAY 4
For using other GPIOs, connected 2 Headers.
More details can find in the attached Google Drive Link:
https://drive.google.com/drive/folders/1Pv8ly59dDn0wV7kZaqK8FAR1IU_2HzSO?usp=sharing
NodeMCU with 4 Channel Module
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