1. Single Bridge/ Half Bridge/ Full Bridge Strain Gauge Terminal Wiring Diagram
2.Hardware Wiring Diagram
2.1 Wired Communication Wiring Diagram:
2.2 Wireless Communication Wiring Diagram:
Below, we use wired RS485 communication for tutorial demonstration
Hardware: Required Items for Operation
- Transmitter
- Strain Gauge c
- RS485 Serial Module
- DC Adapter Female Connector
- 12V Power Supply (can use batteries or power adapters)
- Male-to-Male Dupont Wires
Hardware: Wiring Diagram
Transmitter
V+ ----------------- Power 12V
V- ------------------ Power Ground
B- ------------------ RS485 Serial Port B
A+ ----------------- RS485 serial port A
Wiring diagram/ Connect to computer
3.Computer side: Install the USB driver
Connect the hardware wiring properly and plug it into the computer's USB port.
Next, open the USB driver file in the included materials and double-click to install the ch340/ch341 driver.
After the USB driver is successfully installed, open the computer's Device Manager to check the corresponding COM port number.
4. Computer side: Software usage
Open the software, select the port number (if the port number is not displayed in the dropdown menu, you can manually enter the corresponding port number). Once connected, it is ready for official use.
When the following image appears, it indicates a successful connection, and data read/write operations can proceed normally. If it does not appear, check whether the communication cable between the transmitter and the USB is properly connected.
The software has a curve display function in the top-left corner, which can be clicked to view the pressure curve.
Multiple transmitters can be networked to display multiple pressure curves, with a maximum of 10 pressure curves displayed simultaneously.
5.Calibration and usage
5.1. Measuring microstrain με
If measuring microstrain, simply select the bridge circuit, resistance value, and corresponding attachment method in the microstrain column, then save the parameters to begin collecting strain gauge data.
Additionally, the method for attaching strain gauges is very strict, and non-professionals may produce significantly varying data. In such cases, the strain gauge should be reattached before measurement. The data output by the transmitter is collected from the strain gauge signal terminals. If data is abnormal, check the strain gauge. The lead length should also not be too long, as the cable may introduce signal interference and attenuation. A gradual increase or decrease in data may be due to temperature effects, which can be ignored. When the object undergoes significant deformation, the data will change geometrically.
5.2. Measuring other deformations, strains, pressures, etc.
If measuring other deformations, strains, or pressures, data calibration must be performed for the actual application scenario.
Calibration method:
For / pressure sensors ( or strain gauge sensors, calibration is mandatory when first connected to the transmitter module. ) Calibration is required before normal use. The calibration process consists of 2 two main steps: zero calibration and calibration scaling.
[Step 1] Disable the write protection function ( If already disabled, this step can be skipped to avoid repetition.)。
[Step 2] Zero calibration: Remove all objects from the weighing pan or ( tray ), then send the zero calibration command. This saves the current AD value as the (initial zero point) permanently.
[Step 3] Calibration scaling: Place a standard weight on the weighing pan. (The weight should not be too light; ideally, it should be greater than 20% of its range.) Enter the weight value and send the calibration command. The calibration is complete when the module returns data matching or very close to the weight value. If unsatisfactory, repeat the calibration command.
6.Network wiring method
6.1. Wired network wiring method
[Step 1]
Set the address number: Before networking, each transmitter must be assigned an address number ( configured via software or commands );
[Step 2]
Wiring: V+V- connects to the power supply. All A+B- pins are connected together, resulting in 2 wires linked to the RS485 serial module's A and B connections.
[Step 3]
PC communication: Connect to the computer software via the serial module, enter the networking interface in the software, or individually select an address number to collect data. Device communication: Connect to industrial control equipment like PLC, and send commands to the corresponding address number to receive data.
6.2. Wireless networking method
[Step 1]
Set the address number: Before networking, each transmitter must be assigned an address number ( configured via software or commands );
[Step 2]
Wiring: All V+V-A+B- pins are connected together, resulting in 4 wires linked to the RS485 wireless transceiver board's transmitter end +-AB connections.
[Step 3]
PC communication: The wireless receiver module is connected to the computer software via USB, enter the networking interface in the software, or individually select an address number to collect data.
Device communication: The wireless receiver is connected to industrial control equipment like PLC via AB lines. The receiver requires power, and sending commands to the corresponding address number will retrieve data.
6.3. Fully wireless networking method
[Step 1]
Set the address number: Before networking, each transmitter must be assigned an address number ( configured via software or commands );
[Step 2]
Wiring: Each transmitter comes with an independent wireless transmitter. V+V- connects to the power supply, and A+B- connects to AB( which can also power the transceiver board while supplying the transmitter)；
[Step 3]
PC communication: The wireless receiver module is connected to the computer software via USB, enter the networking interface in the software, or individually select an address number to collect data.
Device communication: The wireless receiver is connected to industrial control equipment like PLC via AB lines. The receiver requires power, and sending commands to the corresponding address number will retrieve data.
7. [Appendix: Principles of strain gauge measurements for various forces]
A strain gauge is a sensor that detects deformation in an object, The amount of deformation is extremely minute, and deformation occurs only when the object is subjected to an external force ( such as gravity, pressure, or tension ). The greater the force applied, the larger the deformation. This deformation can be measured by attaching a strain gauge to the object's surface. The larger the deformation, the stronger the signal output by the strain gauge! This principle underlies common electronic scales. For example, the 1 40kg capacity load cell shown below has a strain gauge horizontally attached to the beam. When force is applied, this area bends and deforms, protected by a white soft coating. The high-precision mounting process enables detection of forces as small as 1g.
Although measuring deformation with strain gauges, faces many interference signals during mounting and temperature effects in experiments, strain gauges remain the best solution for micro-strain detection!
Many friends may ask, 'I'm measuring stress, micro-strain, or other forces, not weight! I need micro-strain data—how do I handle the deformation?' In fact, whether measuring micro-strain or force, the principle is the same. Both follow physical mechanics: deformation occurs under force, and the strain gauge simply converts the degree of deformation into an output signal. After connecting the strain gauge, you can gently tap it and observe the data changing geometrically. Alternatively, you can use the curve charts in our provided debugging software for observation. If you only want to observe the general trend of deformation, you can do so immediately after connecting the strain gauge.
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