ESP32 KY-037 High Sensitivity Sound Detection Module Pinout
Overview
The KY-037 is a high sensitivity sound detection module featuring an electret condenser microphone and an LM393 comparator. It offers both analog and digital outputs, making it suitable for various sound detection applications, including voice-activated projects and sound level monitoring.
About KY-037 High Sensitivity Sound Detection Module
The KY-037 High Sensitivity Sound Detection Module is equipped with an electret condenser microphone and an LM393 comparator to detect sound levels in the environment. It provides both analog and digital outputs: the analog output gives a voltage proportional to the sound intensity, while the digital output goes high when the sound exceeds a user-defined threshold, adjustable via an onboard potentiometer. This module is ideal for projects involving sound detection, such as voice-activated systems, sound level monitoring, and interactive sound installations.
Where to Buy KY-037 High Sensitivity Sound Detection Module
Starting from
$2 per unit
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KY-037 Datasheet and Technical Specifications
KY-037 Pinout Diagram
The VCC pin is used to supply power to the sensor, and it typically requires 3.3V or 5V (refer to the datasheet for specific voltage requirements). The GND pin is the ground connection and must be connected to the ground of your ESP32.
+V:Connects to the power supply, typically 3.3V or 5V.GND:Connects to the ground of the circuit.D0 (Digital Output):Outputs a high signal when the detected sound exceeds the set threshold.A0 (Analog Output):Provides an analog voltage proportional to the sound intensity.
KY-037 Wiring with ESP32
+V:Connect to ESP323.3V.GND:Connect to ESP32GND.D0 (Digital Output):Connect to an ESP32 GPIO pin configured as a digital input (e.g.,GPIO15).A0 (Analog Output):Connect to an ESP32 ADC pin (e.g.,GPIO34).
KY-037 Troubleshooting Guide
Common Issues
❌ No Response from Sensor
Issue: The sensor does not respond to sound.
Solutions:
- Ensure the module is properly powered with the correct voltage (3.3V or 5V).
- Verify all connections are secure and correctly wired.
- Adjust the sensitivity using the onboard potentiometer.
- Check if the microphone is functioning correctly and not obstructed.
⚠️ False Triggering
Issue: The sensor triggers without any sound input.
Solutions:
- Reduce the sensitivity using the potentiometer to prevent false triggers.
- Ensure the environment is free from electrical noise or interference.
- Check for any loose connections or faulty components on the module.
Debugging Tips
🔍 Serial Monitor
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.
⚡ Voltage Checks
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-037 Code Examples
Arduino Example
int analogPin = A0; // Analog output of the sensor
int digitalPin = 7; // Digital output of the sensor
int ledPin = 13; // Onboard LED
void setup() {
pinMode(analogPin, INPUT);
pinMode(digitalPin, INPUT);
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
Serial.println("KY-037 Sound Detection Module Test");
}
void loop() {
int analogValue = analogRead(analogPin);
int digitalValue = digitalRead(digitalPin);
if (digitalValue == HIGH) {
digitalWrite(ledPin, HIGH); // Turn ON the LED when sound is detected
} else {
digitalWrite(ledPin, LOW); // Turn OFF the LED when no sound is detected
}
Serial.print("Analog Value: ");
Serial.println(analogValue);
delay(1000);
}This Arduino code initializes the analog and digital pins connected to the KY-037 sensor. It reads the analog value to monitor sound intensity and uses the digital output to control the onboard LED, indicating when the sound level exceeds the set threshold. The analog values are printed to the serial monitor every second.
ESP-IDF Example
#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-037 Sound Detection Module 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, Sound Detected: %s\n", voltage, digital_state ? "Yes" : "No");
vTaskDelay(pdMS_TO_TICKS(1000));
}
}This ESP-IDF code configures GPIO34 as an analog input and GPIO15 as a digital input for the KY-037 sound sensor. It reads the analog voltage and digital state, printing the voltage and whether a sound is detected to the console every second.
ESPHome Example
sensor:
- platform: adc
pin: GPIO34
name: "KY-037 Sound 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-037 Sound Sensor Digital"This ESPHome configuration sets up the KY-037 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 sound detection.
PlatformIO Example
platformio.ini
[env:esp32]
platform = espressif32
board = esp32dev
framework = arduinoPlatformIO Example Code
#include <Arduino.h>
#define ANALOG_PIN 34
#define DIGITAL_PIN 15
void setup() {
pinMode(DIGITAL_PIN, INPUT_PULLUP);
Serial.begin(115200);
Serial.println("KY-037 Sound 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 ? "Sound Detected" : "No Sound");
delay(1000);
}This PlatformIO code sets up GPIO34 as an analog input and GPIO15 as a digital input for the KY-037 sensor. It reads the analog voltage and digital state, logging the voltage and sound detection status to the serial monitor every second.
MicroPython Example
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:", "Sound Detected" if digital_value == 1 else "No Sound")
time.sleep(1)This MicroPython script configures GPIO34 as an ADC input and GPIO15 as a digital input for the KY-037 sensor. It continuously reads the sensor values and prints the voltage and sound detection state every second.
Conclusion
The ESP32 KY-037 High Sensitivity Sound Detection 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.
For optimal performance, ensure proper wiring and follow the recommended configuration for your chosen development platform.
Always verify power supply requirements and pin connections before powering up your project to avoid potential damage.
