SHT45 Temperature and Humidity Sensor

​

Pin Configuration

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

​

Key Features of SHT45

• Operating Voltage : 1.08 - 3.6v
• Operating Current (AVG) : 0.4 µA
• Temperature Accuracy: ±0.1°C
• Humidity Accuracy: ±1.0% RH
• Temperature Measurement Range: -40°C to +125°C
• Humidity Measurement Range: 0% to 100% RH
• Interface: I²C (address 0x44 or 0x45)
• Response Time: RH (8s) °C (10s)
• Low Power Consumption: Ideal for battery-powered devices.

​

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 SHT45
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
   We’ll use the SHT45 library from Adafruit
3. Enter the following code into the Arduino IDE

#include <Wire.h>
#include "Adafruit_SHT4x.h"

#define SDA_PIN 4  // Define the SDA pin
#define SCL_PIN 5  // Define the SCL pin

Adafruit_SHT4x sht4 = Adafruit_SHT4x();  // Initialize the sensor object

void setup() {
    Serial.begin(115200);
    while (!Serial) {
        delay(10); // Wait for the serial connection
    }

    Serial.println("SHT45 Sensor Test");

    // Initialize I2C with the custom SDA and SCL pins
    Wire.begin(SDA_PIN, SCL_PIN);  // Initialize I2C on custom pins
    Wire.setClock(100000);  // Set I2C clock to 100kHz for communication

    // Initialize the SHT45 sensor
    if (!sht4.begin()) {
        Serial.println("Couldn't find SHT45 sensor!");
        while (1); // Halt here if the sensor isn't found
    }
    Serial.println("SHT45 sensor found");
}

void loop() {
    sensors_event_t humidity, temp;
    sht4.getEvent(&humidity, &temp);  // Get temperature and humidity data

    // Check if the sensor is returning valid data
    if (isnan(temp.temperature) || isnan(humidity.relative_humidity)) {
        Serial.println("Failed to read sensor data!");
    } else {
        // Print temperature and humidity with extra details
        Serial.print("Temperature: ");
        Serial.print(temp.temperature);
        Serial.println(" *C");

        Serial.print("Humidity: ");
        Serial.print(humidity.relative_humidity);
        Serial.println(" %");
    }

    delay(2000); // Wait for 2 seconds before 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