ESP32 Wireless Module DC 5V 4 Groups Relay Development Board
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People with programming foundation[engineers / students / makers, etc..]
Shipping & Delivery
Shipping & Delivery
Methods & Delivery Time
Standard Express: 25-30 Days
EUB: 25-30 Days
YunTu Express: 10-20 Days
DHL: 10-17 Days
FedEx: 10-17 Days
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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|
|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.
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
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