SparkFun HX711 Load Cell Amplifier 24 Bit

This SparkFun breakout carries the HX711 24-bit A/D converter for load cells. It measures the small voltage change of a load cell's Wheatstone bridge and passes the value to a microcontroller via a two-wire interface with clock and data. In this version the analogue and digital supplies are separated, and the digital supply is filtered with a 3.3 µH inductor and a 0.1 µF capacitor.

Recommended Accessories:

Features:

Load cell connections labelled with colours: RED, BLK, WHT, GRN, YLW
VCC supplies the load cell, VDD sets the logic level. On 3.3 V microcontrollers connect VCC to 5 V and VDD to 3.3 V, otherwise VCC and VDD together
YLW is an optional connection for the shield, not connected to the measuring bridge
Data rate selectable 10 SPS or 80 SPS, rejection of 50 Hz and 60 Hz
Pin header not included

Application Examples:

Electronic scales
Measuring weight and force
Detecting fill level via weight

Documentation:

Technical Data:

Manufacturer: SparkFun (SEN-13879)
Chip: HX711
Operating voltage: 2.7 V to 5 V
Current consumption: below 1.5 mA
Resolution: 24 bits
Channels: 2
Data rate: 10 SPS or 80 SPS
Microcontroller connections: VDD, VCC, DAT, CLK, GND
Load cell connections: RED (E+), BLK (E-), WHT (A-), GRN (A+), YLW (shield)
Usual load cell: red to RED, black to BLK, white to WHT, green to GRN. If the reading falls under load, swap A+ and A-
Cells with 3 wires (half bridge): wire four cells into a full bridge. If the reading falls under load, swap A+ and A-
Dimensions: 31 × 23.5 × 4.3 mm
Weight: 3.4 g