sparkfun HX711 - User Manual

Load Cell Amplifier HX711 Breakout Hookup
Guide


Getting Started
The HX711 load cell amplifier is used to get measurable data out from a
load cell and strain gauge. This Hookup Guide will show you how to get
started with this amplifier using some of the various load cells we carry at
SparkFun.
What You Will Need:
For this simple hook up guide we will just be hooking up a load cell with the
HX711 amplifier, and showing how you would hook up four load sensors
with a combinator board and the HX711 amplifier. To follow along, you’ll
need:
• SparkFun Load Cell Amplifier - HX711
• Any Strain Gauge Based Load Cell:
Load Cell - 200kg, Disc
(TAS606
)

SEN-13332
Load Cell - 50kg, Disc
(TAS606)
 SEN-13331
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sparkfun HX711 Specifications

General

Type	Load Cell Amplifier
Output Data Rate	10Hz or 80Hz
Package	SOP-16
Operating Temperature	-40°C to +85°C
Differential Input Voltage	±20mV
Resolution	24-bit
Sampling Rate	10Hz or 80Hz
Input Voltage	2.7V to 5.5V
Communication Interface	Serial
Gain	128, 64, 32
Current Consumption	1.5mA
Input Channels	2 Differential

Summary

Getting Started

What You Will Need

Lists the essential components required for setting up the load cell amplifier and connecting it.

Load Cell Set Up

Bar Load Cell Mounting

Details mounting bar load cells between plates using screws and spacers for accurate strain measurement.

Disc Load Cell Mounting

Explains how to mount smaller disc load cells by centering them on the button for precise force measurement.

Hardware Hookup

Load Cell Wiring Color Coding

Describes the conventional color coding of load cell wires (RED, BLK, WHT, GRN, YLW) and their connection to the amplifier.

Connecting Load Cells to HX711

Details how to connect load cells to the HX711 amplifier, including VDD, VCC, DAT, CLK, and GND connections.

Combinator Board Setup

Connecting Multiple Load Cells

Explains connecting four load sensors to the combinator board and then to the HX711 amplifier.

Arduino Code

Calibration and Example Code

Guides on using calibration and example code for the HX711, including library sources.