lamaPLC: YR-3180 - Weight sensor module with UART or Modbus communication

The weighing acquisition module is a high-performance, multi-functional electronic weighing equipment. It uses advanced weighing technology to measure item weight in real time and display it on a five-digit digital display. It also includes upper- and lower-limit alarm functions. capable of achieving precise weighing control and monitoring.

At the same time, this product also features a TTL communication interface and Modbus RTU protocol, enabling convenient, rapid communication with PLCs, computers, and other equipment to transmit and remotely control weighing data. In addition, it supports Type-C power supply and button debugging, improving convenience and stability.

Key Specifications and Features

• Function: The YR-3180 is a smart weighing sensor module designed to be integrated into electronic scales and instruments. It converts the mechanical force from a load cell into a precise electrical signal and displays the weight numerically.
• High Precision: It features a 24-bit A/D resolution (using an HX710B AD chip) for accurate weight detection.
• Display: The module has a five-digit digital tube display for intuitive and clear weight readings.
• Connectivity: It supports both TTL and RS-485 interfaces and uses the standard Modbus RTU protocol, enabling data transmission and remote control.
• Alarm Function: The module includes upper- and lower-limit alarms for process control and quality management.
• Power Supply: Powered via a Type-C/5V power supply, it also supports key debugging functions.
• Sensor Compatibility: When powered by the 5V TTL serial port, it can connect up to 1-4 350Q weighing sensors (load cells).
• Acquisition Rate: The A/D acquisition rate can be set to 10 or 40 times per second (default is 10).
• Physical: It is a bare-board module (no shell), measuring 45mm x 22mm.

The module is powered via Type-C or dedicated pins and supports dual communication modes:

• VCC: 5V DC Input.
• GND: System Ground.
• TTL Serial Port:
  • TX: Transmit data (connects to MCU RX).
  • RX: Receive data (connects to MCU TX).
• RS-485 Interface (if the model variant supports it):
  • A (D+): RS-485 Differential A signal.
  • B (D-): RS-485 Differential B signal

Description: YR-3180 Intelligent weighing sensor module

The YR-3180 is an ultrasonic distance sensor that communicates via UART (Serial). It typically outputs a 4-byte data packet (Header, Data High, Data Low, and Checksum) every 100ms.

Arduino Wiring

Using SoftwareSerial is recommended to keep the main hardware serial port (USB) free for your Serial Monitor.

• VCC: 3.3V or 5V (Check your specific module's label)
• GND: Arduino GND
• TX (Sensor): Arduino Pin 10 (RX)
• RX (Sensor): Arduino Pin 11 (TX)

Arduino Example Code

This code listens for the standard 4-byte packet, verifies the checksum, and calculates the distance in millimeters.

#include <SoftwareSerial.h>
 
// RX = 10, TX = 11
SoftwareSerial sensorSerial(10, 11);
 
unsigned char buffer[4];
int distance;
 
void setup() {
  Serial.begin(115200);   // Communication with PC
  sensorSerial.begin(9600); // Standard YR-3180 baud rate
  Serial.println("YR-3180 Sensor Initialized");
}
 
void loop() {
  if (sensorSerial.available() > 0) {
    // Look for the start byte (0xFF)
    if (sensorSerial.read() == 0xFF) {
      buffer[0] = 0xFF;
      for (int i = 1; i < 4; i++) {
        buffer[i] = sensorSerial.read();
      }
 
      // Calculate Checksum: (buffer[0] + buffer[1] + buffer[2]) & 0xFF
      byte sum = (buffer[0] + buffer[1] + buffer[2]) & 0xFF;
 
      if (buffer[3] == sum) {
        // Distance is High Byte << 8 + Low Byte
        distance = (buffer[1] << 8) + buffer[2];
        Serial.print("Distance: ");
        Serial.print(distance);
        Serial.println(" mm");
      } else {
        Serial.println("Checksum Mismatch");
      }
    }
  }
  delay(100); // Match sensor's output frequency
}

Implementation Details

• Data Format: The sensor transmits 4 bytes: 0xFF (Header), Data_H, Data_L, and Checksum.
• Blind Zone: Like most ultrasonic sensors, it has a minimum detection distance (typically 3cm to 25cm) at which readings are inaccurate.
• Interface: If your module has a “Trigger” pin, it may support a “Controlled Mode” where it only sends data after you pull the RX line low.

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