How to Use GLYPHSENSE-SHT45: Examples, Pinouts, and Specs

The GLYPHSENSE-SHT45 is a high-precision digital temperature and humidity sensor manufactured by PCBCUPID (Part ID: GSI002). This sensor is designed to provide accurate environmental measurements in a compact and energy-efficient package. Its digital output simplifies integration into a wide range of applications, including:

• HVAC (Heating, Ventilation, and Air Conditioning) systems
• Weather monitoring stations
• Smart home devices
• Industrial automation
• IoT (Internet of Things) applications

With its robust design and reliable performance, the GLYPHSENSE-SHT45 is an excellent choice for applications requiring precise environmental monitoring.

The GLYPHSENSE-SHT45 has a 4-pin configuration, as detailed below:

To use the GLYPHSENSE-SHT45 in a circuit, follow these steps:

1. Power Supply: Connect the VDD pin to a 2.4V to 5.5V power source and the GND pin to ground.
2. I²C Communication: Connect the SDA and SCL pins to the corresponding I²C data and clock lines of your microcontroller. Use pull-up resistors (typically 4.7 kΩ) on both SDA and SCL lines.
3. Addressing: The GLYPHSENSE-SHT45 has a fixed I²C address of 0x44.

Below is an example of how to interface the GLYPHSENSE-SHT45 with an Arduino UNO:

• Connect the VDD pin to the Arduino's 5V pin.
• Connect the GND pin to the Arduino's GND pin.
• Connect the SDA pin to the Arduino's A4 pin.
• Connect the SCL pin to the Arduino's A5 pin.

#include <Wire.h>

// I2C address of the GLYPHSENSE-SHT45 sensor
#define SHT45_ADDRESS 0x44

void setup() {
  Wire.begin(); // Initialize I2C communication
  Serial.begin(9600); // Start serial communication for debugging
  Serial.println("GLYPHSENSE-SHT45 Sensor Initialization...");
}

void loop() {
  Wire.beginTransmission(SHT45_ADDRESS);
  Wire.write(0xFD); // Command to trigger a measurement
  Wire.endTransmission();
  delay(10); // Wait for measurement to complete

  Wire.requestFrom(SHT45_ADDRESS, 6); // Request 6 bytes of data
  if (Wire.available() == 6) {
    uint16_t temp_raw = (Wire.read() << 8) | Wire.read(); // Read temperature
    Wire.read(); // Skip CRC byte
    uint16_t hum_raw = (Wire.read() << 8) | Wire.read(); // Read humidity
    Wire.read(); // Skip CRC byte

    // Convert raw data to human-readable values
    float temperature = -45 + 175 * (temp_raw / 65535.0);
    float humidity = 100 * (hum_raw / 65535.0);

    // Print results to the Serial Monitor
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" °C");
    Serial.print("Humidity: ");
    Serial.print(humidity);
    Serial.println(" %RH");
  } else {
    Serial.println("Error: No data received from sensor.");
  }

  delay(1000); // Wait 1 second before the next reading
}

• Use decoupling capacitors (e.g., 0.1 µF) near the VDD pin to stabilize the power supply.
• Ensure proper pull-up resistors are used on the I²C lines for reliable communication.
• Avoid exposing the sensor to extreme conditions (e.g., condensation) to maintain accuracy and longevity.

1. Can the GLYPHSENSE-SHT45 operate in high humidity environments?
   Yes, the sensor can measure up to 100% RH, but prolonged exposure to condensation should be avoided.

2. What is the maximum I²C clock speed supported?
   The GLYPHSENSE-SHT45 supports I²C clock speeds up to 1 MHz.

3. How do I ensure long-term accuracy?
   Avoid exposing the sensor to dust, chemicals, or extreme conditions. Periodic calibration may also help maintain accuracy.

4. Can I use the sensor with a 3.3V microcontroller?
   Yes, the sensor operates within a voltage range of 2.4V to 5.5V, making it compatible with 3.3V systems.

This concludes the documentation for the GLYPHSENSE-SHT45. For further assistance, refer to the manufacturer's datasheet or contact PCBCUPID support.