SHT35 Temperature and Humidity Sensor

​

Pin Configuration

• VCC (RED) : 3.3V
• GND (BLACK) : Ground
• SDA (YELLOW) : GPIO (SDA)
• SCL (BLUE) : GPIO (SCL)

​

Key Features of SHT35

• Operating Voltage: 2.15~5.5V
• Operating Current (AVG) : 1.5mA
• Humidity Accuracy: ±1.5%RH
• Humidity Detection Range: 0%RH~100%RH
• Temperature Accuracy: ±0.2℃
• Temperature Detection Range: -40℃~125℃
• Interface: I²C (address 0x44 or 0x45)
• Response Time: ~2 seconds (humidity)
• Power Consumption: Low power, ideal for battery-powered applications.

​

Application

• HVAC Systems: HVAC systems to monitor and control temperature and humidity, ensuring comfortable indoor environments.
• Weather Stations: These sensors are used in weather stations to measure temperature and humidity for weather forecasting.
• Industrial Monitoring: The SHT35 is used in various industrial settings to monitor temperature and humidity, which can affect production processes and equipment performance.
• Smart Agriculture:The SHT35 can be used in agriculture to monitor soil and air temperature and humidity, optimizing irrigation and crop management.

​

Step 1: Hardware Required

1. GLYPH-C6 Board
2. GSense SHT35
3. Breadboard

​

Step 2: Circuit Diagram

• Connect VCC of the sensor to +3.3V of the GLYPH board
• Connect SDA of the sensor to the SDA(GPIO4) of the GLYPH board
• connect SCL of the sensor to the SCL(GPIO5) of the GLYPH board
• Connect GND of the sensor to GROUND of the GLYPH board

​

Step 3: Code Setup

1. Open Arduino IDE
2. Install the Necessary Libraries Download and install Adafruit_SHT31, this library works for SHT3x Series.
3. Enter the following code into the Arduino IDE

#include <Wire.h>              // Include the Wire library for I2C communication
#include "Adafruit_SHT31.h"    // Include the Adafruit SHT31 library (compatible with SHT35)

// Define I2C pins for GlyphC6
#define SDA_PIN 4  // GPIO4 as SDA (I2C Data)
#define SCL_PIN 5  // GPIO5 as SCL (I2C Clock)

// Create an instance of the SHT31 class (compatible with SHT35)
Adafruit_SHT31 sht35 = Adafruit_SHT31();

void setup() {
    Serial.begin(115200);  // Start serial communication at 115200 baud rate
    
    // Wait for the serial monitor to open (useful for debugging)
    while (!Serial) {
        delay(1000);
    }
    
    Serial.println("SHT35 Sensor Test with GlyphH2");

    // Initialize I2C communication with the defined SDA and SCL pins
    Wire.begin(SDA_PIN, SCL_PIN);  
    
    // Initialize the SHT35 sensor with its default I2C address (0x45 is the alternate address)
    if (!sht35.begin(0x44)) {  
        Serial.println("Couldn't find SHT35 sensor! Check wiring.");
        delay(1000); // Wait before retrying
    } else {
        Serial.println("SHT35 sensor found!");
    }
}

void loop() {
    // Read temperature in Celsius
    float temp = sht35.readTemperature();
    
    // Read humidity in percentage
    float humidity = sht35.readHumidity();
    
    // Check if the readings are valid (not NaN)
    if (!isnan(temp) && !isnan(humidity)) {
        Serial.print("Temperature: ");
        Serial.print(temp);
        Serial.println(" *C");
        
        Serial.print("Humidity: ");
        Serial.print(humidity);
        Serial.println(" %RH");
    } else {
        Serial.println("Failed to read from SHT35 sensor!");
    }

    delay(2000);  // Wait 2 seconds before taking the next reading
}

​

Step 4: Upload the Code

1. Connect the Board

• Connect your GLYPH board to your computer

2. Select the Board and Port Do the following settings in your Arduino IDE, Do the following settings in your Arduino IDE,
   • Tools > Board > esp32 > Pcbcupid GLYPH C6

• Tools > Port and select the port connected to your GLYPH.
• Tools > USB CDC on Boot > Enabled

3. Upload the Code

• Click the upload button (➡️ icon) or use the shortcut CTRL + U in Arduino IDE to upload the code to the board.

​

Step 5: Observe the Output on the Serial Monitor