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

The STC-1000 is a versatile digital temperature controller manufactured by SMKN1GEMPOL (Part ID: SMKN1GEMPOL). It is widely used in refrigeration, heating, and other temperature-sensitive applications. The device is equipped with a dual relay output, enabling it to control both heating and cooling systems. With its built-in temperature sensor input and intuitive interface, the STC-1000 allows users to set and maintain precise temperature ranges with ease.

• Refrigeration systems for food storage
• Incubators for hatching eggs
• Aquariums and terrariums
• Home brewing and fermentation processes
• HVAC systems for temperature regulation

1. Power Connection: Connect the live (L) and neutral (N) wires of the AC power supply to pins 1 and 2, respectively.
2. Relay Outputs:
   • Connect the cooling device (e.g., a compressor) to pins 3 (NO) and 4 (COM).
   • Connect the heating device (e.g., a heater) to pins 5 (NO) and 6 (COM).
3. Sensor Connection: Attach the NTC temperature sensor to pins 7 and 8. The sensor is polarity-independent.
4. Configuration:
   • Power on the device.
   • Use the front panel buttons to set the desired temperature range and hysteresis (temperature difference for switching).
   • Configure the delay time for relay activation to protect connected devices.

• Ensure the total current drawn by the connected heating and cooling devices does not exceed the relay ratings (10A at 220V AC).
• Place the temperature sensor in a location that accurately represents the environment being controlled.
• Avoid exposing the device to excessive moisture or dust to ensure long-term reliability.
• Use proper insulation and secure connections to prevent electrical hazards.

The STC-1000 can be used alongside an Arduino UNO for advanced automation. Below is an example code snippet to monitor the temperature readings from the STC-1000's sensor:

// Example code to read temperature data from the STC-1000 sensor
// Note: This assumes the NTC sensor is connected to an analog pin on the Arduino

const int sensorPin = A0; // Analog pin connected to the NTC sensor
float voltage, resistance, temperature;

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

void loop() {
  int sensorValue = analogRead(sensorPin); // Read raw sensor value
  voltage = sensorValue * (5.0 / 1023.0); // Convert to voltage
  resistance = (10000.0 * voltage) / (5.0 - voltage); // Calculate resistance
  
  // Convert resistance to temperature (simplified calculation for 10k NTC)
  temperature = 1 / (0.003354 + 0.000256985 * log(resistance / 10000.0)) - 273.15;

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

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

1. Device Does Not Power On:

   • Check the power supply voltage and ensure proper wiring to pins 1 and 2.
   • Verify that the fuse (if present) is not blown.

2. Temperature Readings Are Inaccurate:

   • Ensure the NTC sensor is properly connected to pins 7 and 8.
   • Check for damage to the sensor or its cable.
   • Calibrate the device if necessary using the settings menu.

3. Relays Do Not Activate:

   • Confirm that the set temperature range and hysteresis are configured correctly.
   • Check the connected devices for proper operation.
   • Ensure the relay output wiring is correct and secure.

4. Display Shows Error Codes:

   • E1: Sensor is disconnected or damaged. Verify the sensor connection.
   • EE: Internal memory error. Reset the device or contact the manufacturer.

• Can the STC-1000 be used with DC-powered devices? No, the STC-1000 is designed for AC-powered devices only.

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

• How do I reset the STC-1000 to factory settings? Press and hold the "SET" button for 5 seconds while powering on the device.

• Can I use the STC-1000 outdoors? The device is not weatherproof. Use it in a dry, indoor environment or within a protective enclosure.