This sensor emits a signal if the front metal tip of the sensor is touched (in this case a touch with the finger is meant). Sensitivity of the sensor can be adjusted by means of a controller.

Digital output: If a touch is detected, a signal is output

Analog output: Direct measurement value of the sensor unit

LED1 : Indicates that the sensor is powered

LED2 : Shows that a touch has been detected

Function of the sensor

This sensor has three functional components on its board. This is the sensor unit at the front of the module, which physically measures the current environment and outputs it as an analog signal to the second unit, the amplifier. This amplifies the signal depending on the resistor set on the rotational potentiometer and directs it to the analog output of the module.

It is important to note: The signal is inverted; if a high value is measured, this results in a lower voltage value at the analog output.

The third unit is a comparator that switches the digital output and the LED when the signal falls below a certain value. By means of the rotary potentiometer, the sensitivity can be adjusted, as shown in the following picture:

This sensor does not give absolute values (e.g. exactly measured temperature in °C or magnetic field strength in mT), but it is a relative measurement: One defines a limit value relative to the given normal environmental situation and a signal is given, which can be further processed, if this limit value is exceeded or another state than the normal case has occurred.

This behavior is excellent for temperature monitoring (KY-028), proximity switches (KY-024, KY-025, KY-036), alarm monitors (KY-037, KY-038), or encoders (KY-026).

Pin Assignment

Code example Arduino

Connection assignment Arduino

Arduino Sensor
5V +V
ground GND
Pin 3 Digital Signal
Pin A0 Analog Signal

The program reads the current voltage value, which can be measured at the analog output, and outputs it on the serial port.

In addition, the status of the digital pin in the console is also indicated, which means whether the limit has been exceeded or not.

// Declaration and initialization of input pins
int Analog_Input = A0; // Analog output of the sensor
int Digital_Input = 3; // Digital output of the sensor
void setup  ( )
  pinMode (Analog_Input, INPUT);
  pinMode (Digital_Input, INPUT);
  Serial.begin (9600) ;  //  Serial output with 9600 bps
//  The program reads the current values of the input pins
// and outputs it on the serial output
void loop  ( )
  float  Analogous;
  int Digital;
  //Actual values are read out, converted to the voltage value...
  Analog =  analogRead (Analog_Input)  *  (5.0 / 1023.0); 
  Digital = digitalRead (Digital_Input) ;
  //...  and issued at this point
  Serial.print  ("Analog voltage value:");  Serial.print (Analog,  4) ;   Serial.print  ("V, ");
  Serial.print (“Limit:”)  ;
  if  (Digital==1) 
      Serial.println (“reached”);
      Serial.println (" not yet reached");
  Serial.println  ( " ----------------------------------------------------------------") ;
  delay (200)  ;

Sample program download](/files/files/sensors/KY-036/

Code example Raspberry Pi

Connection assignment Raspberry Pi

Raspberry Pi Sensor
GPIO 24 [Pin 18] Digital Signal
3,3V [Pin 1 ] +V
Mass [ Pin 6 ] GND
KY-053 A0 Analogue signal
Sensor KY-053
Analogue signal A0
+V 3,3V [Pin 1 ]
GND Mass [ Pin 6 ]
Raspberry Pi KY-053
GPIO 3 [ Pin 5 ] SCL
Gpio 2 [Pin 3 ] SDA

Analog sensor, therefore the following must be considered.

In contrast to the Arduino, the Raspberry Pi has no analog inputs and no ADC (analog digital converter) is integrated in the chip of the Raspberry Pi. This limits the Raspberry Pi, if you want to use sensors, where not digital values are output [voltage value exceeded -> digital ON | voltage value undercut -> digital OFF | example: button pressed [ON] button released [OFF]], but it should be a continuous variable value (example: potentiometer -> other position = other voltage value).

To avoid this problem, our sensor kit X40 has the KY-053, a module with 16 bit accurate ADC, which you can use on the Raspberry to expand it with 4 analog inputs. This module is connected to the Raspberry Pi via I2C, takes over the analog measurement and passes the value digitally to the Raspberry Pi.

Thus, we recommend to connect the KY-053 module with the said ADC in between for analog sensors of this set. More information can be found on the information page for the KY-053 Analog Digital Converter.

The program uses the corresponding ADS1x15 and I2C Python libraries from Adafruit to drive the ADS1115 ADC. These have been published at the following link under the MIT license. The required libraries are not included in the download package below.

The program uses the ADS1115 ADC to measure the current voltage value at the ADC, uses this to calculate the current resistance of the NTC, uses values determined in advance for this sensor to calculate the temperature, and outputs this to the console.

Please note that you need to enable I2C on your Raspberry Pi before using this example.

# coding=utf-8

import time
import board
import busio
import adafruit_ads1x15.ads1115 as ADS
from adafruit_ads1x15.analog_in import AnalogIn
import RPi.GPIO as GPIO
# Create the I2C bus
i2c = busio.I2C(board.SCL, board.SDA)

# Create the ADC object using the I2C bus
ads = ADS.ADS1115(i2c)

# Create single-ended input on channels
chan0 = AnalogIn(ads, ADS.P0)
chan1 = AnalogIn(ads, ADS.P1)
chan2 = AnalogIn(ads, ADS.P2)
chan3 = AnalogIn(ads, ADS.P3)

delayTime = 1
Digital_PIN = 24

GPIO.setup(Digital_PIN, GPIO.IN, pull_up_down = GPIO.PUD_OFF)

while True:
    analog = '%.2f' % chan0.voltage
    # output to console
    if GPIO.input(Digital_PIN) == False:
        print ("Analog voltage value:", analog, "V, ", "Limit: not yet reached")
        print ("Analog voltage value:", analog, "V, ", "Limit: reached")
    print ("---------------------------------------")
    # reset + delay
    button_pressed = False

Sample program download

To start with the command:

sudo python3

Code example Micro:Bit

Pin assignment Micro : Bit:

Micro: Bit Sensor
Pin 0 A0
Pin 1 D0
3V +V
Mass GND

This is a MakeCode example for Micro: Bit which essentially does the same as the examples of the other two variants. However, this example is closer to the Raspberry Pi example than the Arduino example.

Sample program download