Wiki Gravity:Terminal Sensor Adapter V2.0-DFRobot


This is universal sensor adapter V2.0, it can be accessed by digital input modules and analog input module. The module with Arduino sensor expansion board, in combination.Improvment compare with the old version, we add a 10K resistor between A & B, A & C respectively, so that you needn't to connect an additional resistor while the sensor must have a pull-up or pull-down resistor. Why need a pull-up or pull down resistor, please refer to "Understanding pull-up and pull-down resistors"

Generally speaking, this terminal provides a much easier way to connect a switch or any modules that requires pull-up/down resistor to microcontroller.


Pin Out

Fig1: Adapter Pin Out

Application with DS18B20

When using temperature Waterproof DS18B20 Digital temperature sensor, need to connect a pull-up resistor for it drived with Arduino microcontroller. The terminal sensor adapter will supply a simple and stable connection in case without soldering.

Application Connection Diagram

Fig2: Application CD

Sample Code

 1.Plugable Terminal Sensor Adapter & Waterproof DS18B20 Digital Temperature Sensor
                 A   ---->     Blue(DATA SIGNAL)
                 B   ---->     RED   (VIN)
                 C   ---->     Black (GND)

 2.Waterproof DS18B20 Digital Temperature Sensor & Arduino board
              1(A)   ---->     Digital Pin2
              2(B)   ---->     5V/3.3V
              3(C)   ---->     GND

 Setting for the Pull-up Register/Pull-down Register Selection Jumpers
     When connect DS18B20 with the adapter,please choose to use the
     Pull-up Register Jumper
#include <OneWire.h>

int DS18S20_Pin = 2; //DS18S20 Signal pin on digital 2

//Temperature chip i/o
OneWire ds(DS18S20_Pin);  // on digital pin 2

void setup(void) {

void loop(void) {
  float temperature = getTemp();

  delay(2000); //just here to slow down the output so it is easier to read


float getTemp(){
  //returns the temperature from one DS18S20 in DEG Celsius

  byte data[12];
  byte addr[8];

  if ( ! {
      //no more sensors on chain, reset search
      Serial.println("no more sensors on chain, reset search!");
      return -1000;

  if ( OneWire::crc8( addr, 7) != addr[7]) {
      Serial.println("CRC is not valid!");
      return -1000;

  if ( addr[0] != 0x10 && addr[0] != 0x28) {
      Serial.print("Device is not recognized");
      return -1000;

  ds.write(0x44,1); // start conversion, with parasite power on at the end

  byte present = ds.reset();;
  ds.write(0xBE); // Read Scratchpad

  for (int i = 0; i < 9; i++) { // we need 9 bytes
    data[i] =;


  byte MSB = data[1];
  byte LSB = data[0];

  float tempRead = ((MSB << 8) | LSB); //using two's compliment
  float TemperatureSum = tempRead / 16;

  return TemperatureSum;


Version history

Terminal sensor adapter V1.1

DFshopping_car1.png Get Terminal sensor adapter V2.0 (SKU:DFR0055) from DFRobot Store or DFRobot Distributor.

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