How to Use STC 1000: Examples, Pinouts, and Specs

The STC 1000 is a versatile digital temperature controller manufactured by SMKN1KRAS (Part ID: A). It is widely used for regulating temperature in a variety of applications, including incubators, aquariums, fermentation chambers, and refrigeration systems. The device features a dual LED display for real-time temperature readings and supports both heating and cooling modes, making it ideal for maintaining precise temperature control.

• Incubators for hatching eggs
• Homebrewing and fermentation chambers
• Aquariums and terrariums
• Refrigeration systems
• Greenhouses and environmental chambers

The STC 1000 has a total of 8 terminals for wiring. Below is the pin configuration:

1. Wiring the Power Supply: Connect terminals 1 and 2 to the AC power source (110-220V). Ensure proper polarity (live and neutral).
2. Connecting the Temperature Sensor: Attach the NTC thermistor sensor to terminals 7 and 8. Place the sensor in the environment where temperature regulation is required.
3. Connecting Heating and Cooling Devices:
   • Connect the heating device to terminals 5 and 6.
   • Connect the cooling device to terminals 3 and 4.
4. Configuring the Temperature Settings:
   • Power on the device.
   • Use the "Set" button to enter the configuration menu.
   • Adjust the desired temperature setpoint and hysteresis (temperature difference for switching).
5. Testing the System: Verify that the heating and cooling devices activate and deactivate as per the set temperature thresholds.

• Ensure all connections are secure and insulated to prevent electrical hazards.
• Use appropriate fuses or circuit breakers to protect the device and connected equipment.
• Avoid placing the temperature sensor near heat sources or in direct sunlight for accurate readings.
• Regularly clean the sensor to maintain accuracy.
• Do not exceed the relay output capacity (10A/220V) to avoid damage.

While the STC 1000 is a standalone device, it can be integrated with an Arduino UNO for advanced monitoring or automation. Below is an example code snippet to read the temperature data from the STC 1000's sensor (NTC thermistor):

// Example code to read temperature from an NTC thermistor
// connected to an analog pin on the Arduino UNO

const int sensorPin = A0; // Analog pin connected to the NTC thermistor
float resistance;         // Variable to store resistance value
float temperature;        // Variable to store calculated temperature

void setup() {
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  int sensorValue = analogRead(sensorPin); // Read analog value from sensor
  resistance = (1023.0 / sensorValue - 1) * 10000; 
  // Convert analog value to resistance (assuming 10k pull-up resistor)

  // Calculate temperature in Celsius using the Steinhart-Hart equation
  float steinhart;
  steinhart = resistance / 10000.0; // (R/Ro)
  steinhart = log(steinhart);       // ln(R/Ro)
  steinhart /= 3950.0;              // 1/B * ln(R/Ro)
  steinhart += 1.0 / (25.0 + 273.15); // + (1/To)
  steinhart = 1.0 / steinhart;      // Invert
  temperature = steinhart - 273.15; // Convert to Celsius

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

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

Note: The above code assumes a 10kΩ pull-up resistor and a B-value of 3950 for the NTC thermistor. Adjust these values based on your specific sensor.

1. Device Does Not Power On:

   • Check the power supply voltage (110-220V AC).
   • Ensure proper wiring to terminals 1 and 2.

2. Incorrect Temperature Readings:

   • Verify the sensor is properly connected to terminals 7 and 8.
   • Ensure the sensor is not damaged or placed in an unsuitable location.

3. Heating or Cooling Devices Not Activating:

   • Check the relay output connections (terminals 3-6).
   • Ensure the devices are functional and within the relay's capacity (10A/220V).

4. Temperature Fluctuations:

   • Adjust the hysteresis setting to reduce frequent switching.
   • Ensure the sensor is not exposed to rapid environmental changes.

Q: Can the STC 1000 be used with DC-powered devices?
A: No, the STC 1000 is designed for AC-powered devices only. Use a DC-AC relay or converter if necessary.

Q: What is the maximum cable length for the temperature sensor?
A: The sensor cable can typically be extended up to 10 meters, but ensure proper shielding to avoid interference.

Q: Can I use the STC 1000 for sub-zero temperature applications?
A: Yes, the STC 1000 supports temperatures as low as -50°C, making it suitable for cold storage applications.

Q: How do I reset the STC 1000 to factory settings?
A: Press and hold the "Set" button for 5 seconds while powering on the device to reset it.

By following this documentation, users can effectively utilize the STC 1000 for precise temperature control in various applications.