LilyGo TTGo T-Weigh ESP32 4x Weight Sensor LoRa Node

The LilyGo T-Weigh is a LoRa node for up to four load cells. The board carries four HX711 load cell amplifiers, each with a 4-pin connector, plus an ESP32 in the T-Micro32 module with WiFi and Bluetooth and the SX1262 LoRa chip for 868 MHz. The board is powered with 5 to 12 V DC via a terminal.

Important: The module has no USB-to-serial converter. Programming requires the LilyGo T-U2T, which is not included. An existing T-U2T can be reused.

The load cells are not included. Each connector takes one load cell as a full bridge with 4 wires (red E+, black E-, white A-, green A+). Half-bridge cells with 3 wires are wired in fours to form one full bridge. If the reading decreases under load, swap A+ and A-.

Important: In Switzerland, a maximum of 25 mW (14 dBm) usually applies in the 868 MHz band. The transmit power is set in the program.

Recommended Accessories:

• LilyGo TTGO T-U2T USB to TTL Programmer CH9102
• 5Kg Load Cell Weight Sensor
• 20Kg Load Cell Weight Sensor
• 50kg Load Cell Weight Sensor

Features:

• 4× HX711 load cell amplifiers (24 bit), routed to the ESP32 via a multiplexer, one 4-pin connector per channel
• ESP32-PICO-D4 in the T-Micro32 module, 4 MB flash, 2.4 GHz WiFi and Bluetooth 4.2
• LoRa with SX1262, 868 MHz, transmit power up to 22 dBm
• Power supply 5 to 12 V DC via 2-pin terminal
• USB-C socket for the T-U2T programmer, no USB-to-serial converter of its own
• Reset and boot button, slide switch

Application Examples:

• Beehive scales and level measurement via weight
• Scales with up to four measuring points
• Integration into Home Assistant with ESPHome

Documentation:

• T-Weigh on GitHub (LilyGo)
• T-Weigh product page (LilyGo)
• ESPHome documentation: HX711 Load Cell Amplifier

Technical Data:

• Manufacturer: LilyGo
• Manufacturer no.: H522
• Microcontroller: ESP32-PICO-D4 (T-Micro32)
• Flash: 4 MB
• Load cell amplifiers: 4× HX711
• LoRa chip: SX1262
• Frequency: 868 MHz
• Transmit power: up to 22 dBm
• Sensitivity: down to -148 dBm
• Protocol according to previous information: LoRaWAN 1.0.3 Class A
• Bluetooth: 4.2
• WiFi: 2.4 GHz
• Power supply: 5 to 12 V DC
• Dimensions: 58 × 50 × 15 mm
• Weight: 27 g

Scope of Delivery:

• 1× LilyGo TTGo T-Weigh ESP32 4x Weight Sensor LoRa Node
• 1× 868 MHz antenna with IPEX connector