HOW to Use Steam Sensor with ESP32

Description

This is a DIY electronic building block water drop sensor. It is an analog (digital) input module, also called rain, rain sensor. It can be used to monitor various weather conditions, detect whether it is raining and the amount of rain, convert it into digital signal (DO) and analog signal (AO) output, and is widely used in Arduino robot kits, raindrops, rain sensors, and can be used for various It can monitor various weather conditions, and convert it into digital signal and AO output, and can also be used for automobile automatic wiper system, intelligent lighting system and intelligent sunroof system.

In the experiment, we input the sensor signal terminal (S terminal) to the analog port of the ESP32 development board, sense the change of the analog value, and display the corresponding analog value on the shell.

Working Principle

Its principle is to detect the amount of water through the exposed printed parallel lines on the circuit board. The more water there is, the more wires will be connected, and the conductive contact area increases. The voltage output by pin 2 will gradually increase. The larger the analog value detected by the signal terminal S is.

It can also detect steam in the air. Two position holes are used to install on the other devices.

Required Components

Connection Diagram

Test Code

//**********************************************************************************
/*  
 * Filename    : Steam sensor
 * Description : Read the basic usage of ADC，DAC and Voltage
 * Auther      : http//www.keyestudio.com
*/
#define PIN_ANALOG_IN  34  //the pin of the Steam sensor

void setup() {
  Serial.begin(9600);
}

//In loop()，the analogRead() function is used to obtain the ADC value, 
//and then the map() function is used to convert the value into an 8-bit precision DAC value. 
//The input and output voltage are calculated according to the previous formula, 
//and the information is finally printed out.
void loop() {
  int adcVal = analogRead(PIN_ANALOG_IN);
  int dacVal = map(adcVal, 0, 4095, 0, 255);
  double voltage = adcVal / 4095.0 * 3.3;
  Serial.printf("ADC Val: %d, \t DAC Val: %d, \t Voltage: %.2fV\n", adcVal, dacVal, voltage);
  delay(200);
}
//**********************************************************************************

Test Result

Connect the wires according to the experimental wiring diagram, compile and upload the code to the ESP32.

After uploading successfully, we will use a USB cable to power on, open the serial monitor and set the baud rate to 9600. The serial monitor will display the steam sensor’s ADC value, DAC value and voltage value. When a few drops of water are placed in the sensor sensing area, the values will change. The more water volume, the greater the output voltage value , ADC value and the DAC value .