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Master Load Cell Wiring for Arduino, Raspberry Pi & IoT Projects
A weight sensor pin configuration is one of the most important things to understand when working with load cells and weighing systems. Each pin (or wire) on a weight sensor serves a specific purpose—power supply, signal output, and ground. Getting the wiring wrong can cause inaccurate readings, calibration errors, or sensor failure.
At Sensors and Gauges, we provide high-quality load cells, HX711 amplifier boards, and complete sensor kits with clear pinout documentation for easy setup.
Weight sensors (also called load cells) typically use strain gauges arranged in a Wheatstone bridge circuit. These are connected to the outside world via 4-pin or 5-pin cables.
4-Pin Load Cell → Common in kitchen scales, small DIY projects.
5-Pin Load Cell → Found in more advanced industrial systems with sense wires.
Each pin carries either excitation voltage (power) or output signal (tiny mV changes that must be amplified).
Standard 4-Pin Weight Sensor Pinout
Most 4-pin load cells follow this color coding:
Red (E+ or VCC) → Excitation+ (Power supply +5V or +10V)
Black (E- or GND) → Excitation- (Ground)
White (A- or Output -) → Signal negative
Green (A+ or Output +) → Signal positive
👉 Pro Tip: Always double-check the datasheet, as colors can vary by manufacturer.
5-Pin Weight Sensor Pinout
Some weight sensors add an extra “Sense” pin to improve accuracy:
Red → Excitation+
Black → Excitation-
White → Signal-
Green → Signal+
Blue/Yellow → Sense (compensates for cable length voltage drop)
👉 This setup is common in industrial-grade load cells used in elevators, cranes, and weighing platforms.
How to Connect Weight Sensor Pins to HX711
The HX711 amplifier module is the most popular interface for microcontrollers. Connection is straightforward:
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Final Thoughts – Weight Sensor Pins
Understanding weight sensor pins is essential for successful wiring, calibration, and integration of load cells into any weighing system. Whether you’re building a DIY Arduino project or designing a smart industrial scale, knowing the correct pinout and connection scheme will save time and prevent costly errors.
At Sensors and Gauges, we provide everything from entry-level load cells to industrial-grade weighing solutions—with expert support to guide you every step of the way.
