Overview
An electro-mechanical relay module board is widely available from any online store. It costs around 1 US Dollars. The working voltage ranges from 3.3 V to 24 V. For Arduino users, a 3.3 V or a 5 V relay relay module are very popular due to a USB-powered bus, during the prototyping. However, a lower voltage rating of a relay draws a higher current.
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| A four-channel relay module board I ordered from an on line store. The working voltage is 5 V. |
A single pole dual throws (SPDT) relay is very popular over the other contact typologies. This kind of relay comes with 5 pins.
Designing A Relay Module Board
Using my own existing components in-stock with an in-house PCB prototyping, making a DIY relay module board is very straight forward. For a few requirements, all components are solder on a strip board without the circuit and PCB design.
For a long term design requirements, I use an EDA tool to design the circuit and PCB. The PCB are made from copper clad board with the etching process.
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Schematic Diagram, The relay is selected to work with 12 V DC due to a high power
requirement.
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| A sample of completed PCB design |
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| Copper track at the bottom |
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| Top silk of the components legend |
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| A 3D Model renders by the Software. |
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| Component Side |
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| Copper Side |
Click here to download the complete design file in Proteus 8.
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