KY-036 Metal Touch Sensor Module
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Overview
About KY-036 Metal Touch Sensor Module
The KY-036 Metal Touch Sensor Module detects touch through its metal tip, providing both analog and digital outputs. The module features an LM393 comparator and a potentiometer to adjust sensitivity, making it suitable for interactive projects and touch-based controls.
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KY-036 Specifications
Complete technical specification details for KY-036 Metal Touch Sensor Module
📊 Technical Parameters
KY-036 Pinout
The **KY-036** is a 4-pin capacitive touch sensor module:
Visual Pinout Diagram
Pin Types
Quick Tips
**Interface**: Dual output (analog + digital with comparator),👆 **Sensor**: Capacitive touch detection via metal probe,📊 **Analog Output**: Continuous capacitance measurement
**Digital Output**: Threshold-based trigger (adjustable via potentiometer),⚡ **Power**: 3.3V or 5V operation,🎚️ **Sensitivity**: Adjustable via onboard potentiometer
**LED Indicators**: Power LED and touch detection LED,🎯 **Applications**: Interactive installations, touch switches, proximity detection, human interface
Pin Descriptions
| Pin Name | Type | Description | Notes |
|---|---|---|---|
1 GND | Power | Ground connection | |
2 +V | Power | Power supply | 3.3V or 5V |
3 D0 | Communication | Digital output | HIGH when touch detected |
4 A0 | Communication | Analog output | Voltage reading of touch sensor |
Wiring KY-036 to ESP32
To interface the **KY-036** with an **ESP32** for touch detection:
Visual Wiring Diagram
Connection Status
Protocol
Pin Connections
| KY-036 Pin | Connection | ESP32 Pin | Description |
|---|---|---|---|
1 GND Required | GND | Ground | |
2 +V Required | 3.3V or 5V | Power supply | |
3 D0 Optional | GPIO15 | Digital input (any GPIO) | |
4 A0 Optional | GPIO34 | Analog input (ADC pin) |
**Digital Mode**: Use D0 for simple on/off touch detection
**Analog Mode**: Use A0 for proximity sensing or pressure measurement
**ADC Pins**: Use GPIO32-39 for analog input on ESP32
**Voltage**: 3.3V recommended for ESP32 ADC compatibility
**Adjustment**: Turn potentiometer to set touch sensitivity threshold
**Touch Probe**: Metal tip detects body capacitance when touched
**Grounding**: User must be grounded (touching ground or standing on floor) for reliable detection
**LED Feedback**: Status LED lights when touch detected
KY-036 Troubleshooting
Common issues and solutions to help you get your sensor working
Common Issues
Issue: The sensor does not respond to touch.
Solutions:
- Ensure the module is properly powered with the correct voltage.
- Verify all connections are secure and correctly wired.
- Adjust the sensitivity using the onboard potentiometer.
Issue: The sensor triggers without being touched.
Solutions:
- Reduce the sensitivity using the potentiometer to prevent false triggers.
- Ensure the environment is free from electrical noise or interference.
- Check for any conductive materials accidentally touching the sensor's metal tip.
Debugging Tips
Use the Serial Monitor to check for error messages and verify the sensor's output. Add debug prints in your code to track the sensor's state.
Use a multimeter to verify voltage levels and check for continuity in your connections. Ensure the power supply is stable and within the sensor's requirements.
Additional Resources
KY-036 Programming Examples
Ready-to-use code examples for different platforms and frameworks
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.println("KY-036 Touch Recognition");
}
void loop() {
float analog_value = analogRead(analog_input) * (5.0 / 1023.0);
int digital_value = digitalRead(digital_input);
Serial.print("Analog voltage value: ");
Serial.print(analog_value, 4);
Serial.print(" V, Threshold value: ");
if (digital_value == 1) {
Serial.println("reached");
} else {
Serial.println("not yet reached");
}
Serial.println("----------------------------------------------------------------");
delay(1000);
}This Arduino code initializes the analog and digital input pins connected to the KY-036 sensor. It reads the analog voltage and digital state, printing the analog voltage and whether the threshold set by the potentiometer has been reached to the serial monitor every second.
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/adc.h"
#include "driver/gpio.h"
#define ANALOG_PIN ADC1_CHANNEL_6 // GPIO34
#define DIGITAL_PIN GPIO_NUM_15
void app_main(void) {
adc1_config_width(ADC_WIDTH_BIT_12);
adc1_config_channel_atten(ANALOG_PIN, ADC_ATTEN_DB_11);
gpio_set_direction(DIGITAL_PIN, GPIO_MODE_INPUT);
printf("KY-036 Touch Sensor Test\n");
while (1) {
int raw = adc1_get_raw(ANALOG_PIN);
float voltage = raw * (3.3 / 4095.0);
int digital_state = gpio_get_level(DIGITAL_PIN);
printf("Analog Voltage: %.2f V, Threshold: %s\n", voltage, digital_state ? "reached" : "not yet reached");
vTaskDelay(pdMS_TO_TICKS(1000));
}
}This ESP-IDF code configures GPIO34 as an analog input and GPIO15 as a digital input for the KY-036 sensor. It reads the analog voltage and digital state, printing the voltage and whether the threshold has been reached to the console every second.
sensor:
- platform: adc
pin: GPIO34
name: "KY-036 Touch Sensor Analog"
update_interval: 1s
filters:
- multiply: 3.3
- lambda: |-
return x * 1000; // Convert to millivolts
binary_sensor:
- platform: gpio
pin:
number: GPIO15
mode: INPUT_PULLUP
name: "KY-036 Touch Sensor Digital"This ESPHome configuration sets up the KY-036 sensor with both an analog and digital sensor. The analog value from GPIO34 is converted to millivolts, while the digital sensor on GPIO15 acts as a binary sensor to indicate touch detection.
platformio.ini
[env:esp32]
platform = espressif32
board = esp32dev
framework = arduinomain.cpp
#include <Arduino.h>
#define ANALOG_PIN 34
#define DIGITAL_PIN 15
void setup() {
pinMode(DIGITAL_PIN, INPUT_PULLUP);
Serial.begin(115200);
Serial.println("KY-036 Touch Sensor Test");
}
void loop() {
int raw_value = analogRead(ANALOG_PIN);
float voltage = raw_value * (3.3 / 4095.0) * 1000; // Convert to millivolts
int digital_value = digitalRead(DIGITAL_PIN);
Serial.printf("Analog Voltage: %.2f mV, Digital State: %s\n", voltage, digital_value ? "Touched" : "Not Touched");
delay(1000);
}This PlatformIO code sets up GPIO34 as an analog input and GPIO15 as a digital input for the KY-036 sensor. It reads the analog voltage and digital state, logging the voltage and touch detection status to the serial monitor every second.
import machine
import time
ANALOG_PIN = machine.ADC(machine.Pin(34))
ANALOG_PIN.atten(machine.ADC.ATTN_11DB)
DIGITAL_PIN = machine.Pin(15, machine.Pin.IN, machine.Pin.PULL_UP)
while True:
analog_value = ANALOG_PIN.read()
voltage = (analog_value / 4095) * 3300 # Convert to millivolts
digital_value = DIGITAL_PIN.value()
print("Analog Voltage:", voltage, "mV", "| Digital State:", "Touched" if digital_value == 1 else "Not Touched")
time.sleep(1)This MicroPython script configures GPIO34 as an ADC input and GPIO15 as a digital input for the KY-036 sensor. It continuously reads the sensor values and prints the voltage and touch state every second.
Wrapping Up KY-036
The ESP32 KY-036 Metal Touch Sensor Module is a powerful KY-0xx module sensor that offers excellent performance and reliability. With support for multiple development platforms including Arduino, ESP-IDF, ESPHome, PlatformIO, and MicroPython, it's a versatile choice for your IoT projects.
Best Practices
For optimal performance, ensure proper wiring and follow the recommended configuration for your chosen development platform.
Safety First
Always verify power supply requirements and pin connections before powering up your project to avoid potential damage.
Ready to Start Building?
Now that you have all the information you need, it's time to integrate the KY-036 into your ESP32 project and bring your ideas to life!
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