Relay ESP32 Shield

£8.00 GBP
DO NOT apply the Lonely Binary ESP32 Relay Shield to live home AC circuits. Unauthorized modifications or use on home AC circuits can be extremely hazardous.

Package: Relay Shield

Relay Shield
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The Lonely Binary ESP32 Relay Shield is designed exclusively for educational purposes and use within low voltage laboratory environments.


  • DO NOT apply the Lonely Binary ESP32 Relay Shield to live home AC circuits. Unauthorized modifications or use on home AC circuits can be extremely hazardous.
  • Legal Restriction: Modifications to live AC home circuits must only be performed by legally certified electricians. Non-compliance is not only dangerous but may also violate local electrical codes and regulations.

Failure to adhere to these safety instructions could lead to severe injury or death. Exercise caution and ensure all safety protocols are followed.

The Lonely Binary ESP32 Relay Shield offers versatile control of both AC and DC power circuits, expanding beyond the capabilities of our standard Mosfet ESP32 Shield, which is limited to DC control. This Relay Shield utilizes an electromechanical switch mechanism that allows the activation of high power circuits using a minimal control signal from a lower voltage circuit. Ideal for integration with microcontroller projects, particularly with the ESP32, it enables safe and efficient management of larger electrical loads that are unsuitable for standard electronic switches.

Key Features:

  • Compatibility: Specifically designed for the ESP32 microcontroller.
  • Control Interface: Uses ESP32 Digital IO pin 13 for straightforward relay operation. Setting this pin to high activates the relay, allowing current to flow, while setting it to low deactivates the relay, cutting off the current.
  • Terminals:
    • NO (Normally Open): This terminal is initially disconnected when the relay is inactive. Upon energizing the relay, the NO terminal connects to the COM terminal, completing the circuit to enable current flow.
    • NC (Normally Closed): In its default state, this terminal is connected, creating a closed circuit with the COM terminal. Activating the relay opens this connection, thus interrupting the circuit and stopping current flow.
    • COM (Common): Serves as the central connection point in the relay, switching between the NO and NC terminals based on the relay's activation state.

The Lonely Binary ESP32 Relay Shield is an essential component for developers looking to control higher power applications with precision and reliability. Whether you’re managing household appliances or industrial equipment, this Relay Shield provides the control you need with the ease and safety required for complex projects.




  • Australia Orders over $55 - Your order will enjoy free shipping via Australia Post Standard Shipping Services. 
  • International Orders over $99 - Your order will be posted via Australia Post Air Mail Services. 

Raspberry Pi board / Micro:bit board / NVIDIA board will be excluded; All PCB orders will not enjoy free shipping. Distributors and wholesale orders are not eligible for free shipping.


At this time, LONELY BINARY is an online-only business, with our products available through This allows us to keep the cost down for the customer. Orders cannot be picked up. 


We ship Australia wide to all addresses, including PO Box, Parcel Locker, etc.All Australian orders will be shipped via Australia Post, Courier Please or Fastway Couriers (Aramex). International Orders will be shipped via Australia Post or DHL. Your order will be shipped within one business day after we receive payment, providing the items are in stock.

  • Standard Shipping
    Sent via standard Australia Post stamped letter mail, typically 5-9 business days. No tracking/support available other than confirmation of dispatch.
  • Express Post
    Sent via Australia Post Express Service, Fastway Courier or Courier Please, 1 – 2 business days for metro orders, potentially longer for orders outside of metro zones, with full tracking.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Shipping costs for international orders vary depending on location and package size, where possible we have kept this to flat rate charges to reduce confusion. International orders are shipped through Australia Post and DHL courier service depending on the most economical at the time. 


Shipping Method via Delivery Area Delivery Time(business day) Tracking No. Weight Limit
DHL Asia 1-2 YES No Limit
western EU 2-3 YES No Limit
eastern EU 3-5 YES No Limit
North America 2-3 YES No Limit
Australia 2-3 YES No Limit
South America 3-5 YES No Limit
South Africa 3-5 YES No Limit


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