1. Strain Gauge Wiring Diagram
2. Wireless Transmission Schematic
3.Hardware Wiring
3.1 Below is the One-to-One Wireless Communication Operation Guide
I. Hardware: Required Items for Operation
Full-Bridge Strain Gauge
Wireless Acquisition Board
Wireless Receiver Board
3.7V Battery (3.7V~12V batteries or power adapters can be used)
USB Cable
II. Hardware: Wiring Schematic
Wiring Diagram/Connecting to Computer
3.2 Below is the One-to-Many Wireless Communication Operation Guide(Example: One-to-Three)
Note Before operating in one-to-many mode, refer to the one-to-one method above to individually connect each acquisition board and set the address numbers (Address 1, Address 2, Address 3, etc.) for each board
I. Hardware: Required Items for Operation
Full-Bridge Strain Gauge x3
Wireless Acquisition Board x3
Wireless Receiver Board x1
3.7V battery x3
USB data cable x1
(One-to-three) Operation Checklist
II. Hardware: Wiring Schematic
Wiring Diagram/Connecting to Computer
4. Computer side: Install USB driver
Connect the hardware wiring properly and plug it into the computer's USB port.
Then open the USB driver file included in the provided materials and double-click to install the CH340/CH341 driver.
After successful USB installation, open the computer's Device Manager to check the corresponding COM port number.
5. 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), and connect to start formal 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 USB is properly connected!
The software has a graph 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.
Network interface
6. Calibration and Usage
6.1. Measuring microstrain μ ε
For microstrain measurement, simply select the bridge circuit, resistance value, and corresponding mounting method in the microstrain column, save the parameters, and then start collecting strain gauge data.
Additionally, regarding the strain gauge mounting method, the requirements are very strict. Non-professionals may produce significantly inconsistent data. In such cases, it is generally necessary to reattach the strain gauge before measurement. The data output by the transmitter is collected from the strain gauge signal terminals. If data anomalies occur, it is recommended to check the strain gauge. Furthermore, the lead length should not be too long, as the cable itself may introduce signal interference and attenuation. Gradual increases or decreases in data may be due to temperature effects, which can be ignored. When the object undergoes significant deformation, the data will change exponentially.
6.2. Measuring other deformations, strains, pressures, etc.
For measuring other deformations, strains, or pressures, data calibration is required for the actual application scenario.
Calibration method:
When a pressure sensor/strain gauge sensor is first connected to the transmitter module, it must be calibrated before normal use. Calibration mainly involves two steps: zero calibration and calibration setting.
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 (tray), send the zero calibration command, and permanently save the current AD value as the zero point (initial value).
Step 3: Calibration setting: Place a standard weight on the weighing pan (the weight should not be too light, preferably more than 20% of its range), input the weight value, and send the weight calibration command. When the data returned by the module matches or is very close to the weight value, calibration is complete. If unsatisfactory, repeat the weight calibration command.
7. [Appendix: Introduction to the principles of measuring various forces with strain gauges]
A strain gauge is a sensor used to detect deformation in an object. The amount of deformation an object undergoes is extremely minute. Moreover, deformation occurs only when the object is subjected to an external force (such as gravity, pressure, tension, etc.). The greater the force applied to the object, the larger the deformation. This deformation can be measured by attaching a strain gauge to the surface of the object. The greater the deformation of the object, the stronger the signal output by the strain gauge! This principle is the basis for common electronic scales. Figure 1 below shows a 40kg-capacity load cell, where the strain gauge is horizontally attached to the beam. When force is applied, this area bends and deforms, and it is protected by a white soft coating. Thanks to this high-precision mounting process, even a force as small as 1g can be detected.
Although using strain gauges to measure object deformation involves many interference signals during the mounting process and temperature effects during experiments, strain gauges remain the best solution for detecting micro-strain!
Some may ask: 'I'm measuring stress, micro-strain, or other forces, not weight! I need micro-strain data—how do I account for deformation?' In reality, whether measuring micro-strain or force, the principle is the same, grounded in physical mechanics. When force causes deformation, the strain gauge simply converts the degree of deformation into an output signal. After connecting the strain gauge, gently tapping it will show the data changing geometrically. Alternatively, you can observe the changes using the curve charts in our debugging software. If you only need to observe the general trend of an object's deformation, simply connecting the strain gauge will suffice.
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