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ESP32 Wireless Module DC 5V 4 Groups Relay Development Board

Regular price $10.01 USD
Regular price Sale price $10.01 USD
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Relevant technical or usage issues can be also discussed in our GitHub or Community.

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About Tax

At present, the price of the platform does not include tax.
Customers in Europe should pay attention to the tax problem after the package reaches the local country.

[orders over 150 euros may generate tax, which needs to be borne/handled by the customer, the local policy shall prevail.]

Commended User

People with programming foundation[engineers / students / makers, etc..]

Shipping & Delivery

Methods & Delivery Time

During ship, maybe some methods of transport do not update the logistic track until the parcel reaches the destination country.

  1. Standard Express: 25-30 Days
  2. EUB: 25-30 Days
  3. YunTu Express: 10-20 Days
  4. DHL: 10-17 Days
  5. FedEx: 10-17 Days

We can ship to DHL/FedEx through a third-party channel (Freight Forwarder) because we don't have DHL/FedEx account.
Means : we --> third-party channel(Freight Forwarder) -->official DHL /Fedex-->you

If you do not see one of the above shipping methods when checking out, it may be because your country does not support that shipping method, please select one of the available channels already listed or contact us for assistance.

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LILYGO® TTGO T-Relay ESP32 Wireless Module DC 5V 4 Groups Relay Development Board 4MB Flash WiFi Bluetooth Remote Switch Control


Bus Interfaces UART, SPI, I2C, CAN, 12S, SDIO
Wireless Wi-Fi 802.11 b/g/n
Bluetooth BLE V4.2
Onboard Functions 4 Groups of relays
Optocoupler Isolation  16 Expansion GPIO

HRS4H-S-DC5V Relay: 4 Blue LEDs Relay Work Indicator
①K1 Relay: GPIO21
②K2 Relay: GPIO19
③K3 Relay: GPIO18
④K4 Relay: GPIO05

Support T-U2T Upload Tool:
Computer->USB Type-C data cable->
Needs to be connected to T-U2T [USB to
serial] downloader to program , convenient, fast;
USB data line can be directly powered

Technology Support [Github]

If you need technical support please check the link to find more details.


1. Size


2. More Details

3. Pin Diagram


  • 1 x Relay
  • 2 x pin

T-Relay T- U2T Kit

  • 1 X Relay
  • 2 x Pin
  • 1 X T- U2T USB to TTL


View full details

Customer Reviews

Based on 5 reviews
Palladino Bruno
ottimo prodotto.

uso T-relay per il controllo delle tapparelle e temperature di tutti i locali.

Kevin Colvard
Great little relay controller.

Like I said in the description it's a great little board. I use it for an automated plant watering system and keeping a bird bath filled. My only suggestion is adding or pre-purchasing ESP32's with a U.FL Connector for an external antenna. The short distance wifi is the only drawback of the board.

Anton Ilsinger

Works perfect!

T-Relay Board!

I really like the T-Relay Board! The design and functionality are well done. The only thing that is missing on the board is an Ethernet Port. I've already suggested this to the team, and they're on it. Can't wait to see the updated version!

Diego Santana
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