Skip to product information
1 of 7

Ship to Worldwide



ESP32 Wireless Module DC 5V 4 Groups Relay Development Board

Regular price $10.01 USD
Regular price Sale price $10.01 USD
Sale Sold out

⚠️If you need technical support, you can get a quicker response on our GitHub (the tech team will check it directly). Please provide your Tax/Personal ID (if available), this will expedite the shipment of your order.

Instructions Before Order

If you order the wrong product or want to add another or change your shipping address, please re-edit the correct information and place a new order, then contact us to cancel the incorrect order.

If you have a tax ID or personal ID please provide as much as possible, otherwise, if your country requires this information we will block your order and contact you via email, which will slow down the shipment.

We strongly recommend choosing DHL or FedEx if your order is over $200.

Generally, except for DHL or FedEx, we will automatically split orders over $150-200 into two packages due to customs clearance, loss prevention issues, etc.

For more please check here

Shipping & Delivery

Methods & Delivery Time

  1. Standard Express: 25-30 Days
  2. EUB: 25-30 Days
  3. YunTu Express : 10-20 Days
    (Company name can't be used consignee)
  4. DHL: 10-17 Days
  5. FedEx: 10-17 Days
  6. YanWen: 20-35 Days

Please note that all delivery times are estimated for reference only.

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

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 help.

Please make sure your address is fully filled in (including province and continent, which will affect the shipping time of your order)

For more details please check our shipping policy.

About Tax

At present, the price of the platform does not include any tax.
European customers should pay attention to the tax problem after the package reaches the local country, which needs to be borne/handled by the customer, the local policy shall prevail

[orders over 150 euros may generate tax (Amount for reference only), for orders over this amount, we will not inform the customer separately, so please pay attention to it by yourself.]

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


T-Relay W5500 Shield

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

T-Relay W5500 Shield


View full details

Customer Reviews

Based on 6 reviews
Works great. Easy to program.

Had programmed and in service in one hour.

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!