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

Introduction

The STC 1000 is a versatile digital temperature controller designed for regulating temperature in a wide range of applications. It is widely used in incubators, refrigeration systems, brewing setups, and other temperature-sensitive environments. The device features a dual display for real-time temperature monitoring and setpoint adjustment, offering precise control with customizable parameters. Its compact design and ease of use make it a popular choice for both hobbyists and professionals.

Explore Projects Built with STC 1000

STM32F103C8T6-Based Spectral Sensor with ST7735S Display and Pushbutton Control

This circuit features an STM32F103C8T6 microcontroller interfaced with a China ST7735S 160x128 display and two spectral sensors (Adafruit AS7262 and AS7261). It also includes two pushbuttons for user input, with the microcontroller managing the display and sensor data processing.

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STM32F103C8T6-Based Water Level Monitoring and Communication System with SIM900A and LoRa Connectivity

This circuit features a microcontroller (STM32F103C8T6) interfaced with a SIM900A GSM module, an HC-SR04 ultrasonic sensor, a water level sensor, and a LoRa Ra-02 SX1278 module for long-range communication. The STM32F103C8T6 is configured to communicate with the GSM module and LoRa module via serial connections, and it reads data from the ultrasonic and water level sensors. An FTDI Programmer is connected for programming and serial communication with the microcontroller.

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Cellular-Enabled IoT Device with Real-Time Clock and Power Management

This circuit features a LilyGo-SIM7000G module for cellular communication and GPS functionality, interfaced with an RTC DS3231 for real-time clock capabilities. It includes voltage sensing through two voltage sensor modules, and uses an 8-channel opto-coupler for isolating different parts of the circuit. Power management is handled by a buck converter connected to a DC power source and batteries, with a fuse for protection and a rocker switch for on/off control. Additionally, there's an LED for indication purposes.

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STM32F103C8T6-Based Environmental Monitoring System with Multi-Sensor Integration

This circuit features an STM32F103C8T6 microcontroller as the central processing unit, interfacing with various sensors and output devices. It includes an MQ-4 methane gas sensor and an MQ135 air quality sensor for environmental monitoring, both connected to analog inputs. The circuit also controls a buzzer via a BC547 transistor, indicating certain conditions, and displays information on a 16x2 I2C LCD. Turbidity measurement is facilitated by a dedicated module, and a red LED indicates operational status or alerts, with resistors for current limiting and capacitors for power supply stabilization.

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Technical Specifications

The STC 1000 is equipped with essential features and specifications to ensure reliable temperature control. Below are the key technical details:

General Specifications

Power Supply: AC 110V-220V, 50/60Hz
Temperature Range: -50°C to 99°C (-58°F to 210°F)
Temperature Accuracy: ±1°C (±2°F)
Relay Output Capacity:
- Heating: 10A at 220V AC
- Cooling: 10A at 220V AC
Sensor Type: NTC (10kΩ) temperature probe
Display: Dual 3-digit LED display (current temperature and setpoint)
Operating Temperature: -10°C to 60°C (14°F to 140°F)
Storage Temperature: -20°C to 75°C (-4°F to 167°F)
Dimensions: 75mm x 34.5mm x 85mm (L x W x H)

Pin Configuration and Descriptions

The STC 1000 has a total of 8 terminals for wiring. The table below describes each terminal:

Terminal Number	Label	Description
1	Power (L)	Live wire input for AC power supply
2	Power (N)	Neutral wire input for AC power supply
3	Cooling (NO)	Normally open terminal for cooling relay output
4	Cooling (COM)	Common terminal for cooling relay output
5	Heating (NO)	Normally open terminal for heating relay output
6	Heating (COM)	Common terminal for heating relay output
7	Sensor Input 1	Temperature probe input (connect one wire of the NTC sensor)
8	Sensor Input 2	Temperature probe input (connect the other wire of the NTC sensor)

Usage Instructions

How to Use the STC 1000 in a Circuit

Wiring the Power Supply:
- Connect the live wire (L) to terminal 1 and the neutral wire (N) to terminal 2.
- Ensure the power supply matches the voltage rating of the STC 1000 (110V-220V AC).
Connecting the Temperature Probe:
- Attach the two wires of the NTC temperature probe to terminals 7 and 8.
- Place the probe in the environment where temperature monitoring is required.
Wiring the Heating and Cooling Devices:
- For a cooling device (e.g., a refrigerator), connect its live wire to terminal 3 (NO) and its neutral wire to terminal 4 (COM).
- For a heating device (e.g., a heater), connect its live wire to terminal 5 (NO) and its neutral wire to terminal 6 (COM).
Setting the Parameters:
- Power on the STC 1000 and press the "Set" button to enter the parameter configuration mode.
- Adjust the desired temperature setpoint using the "+" and "-" buttons.
- Configure additional parameters such as hysteresis, delay time, and temperature calibration as needed.
Testing the System:
- Verify that the heating and cooling devices activate and deactivate correctly based on the set temperature range.

Important Considerations and Best Practices

Ensure all connections are secure and insulated to prevent electrical hazards.
Place the temperature probe in a location that accurately represents the environment's temperature.
Avoid exposing the STC 1000 to moisture or extreme conditions beyond its operating range.
Use a fuse or circuit breaker for added protection against overcurrent.

Example Arduino Code for Monitoring Temperature

Although the STC 1000 is a standalone device, you can use an Arduino UNO to monitor the temperature from the NTC sensor. Below is an example code snippet:

// Example Arduino code to read temperature from an NTC sensor
// connected to the STC 1000 and display it on the Serial Monitor.

const int sensorPin = A0; // Analog pin connected to the NTC sensor
float resistance = 10000; // Resistance of the NTC sensor at 25°C
float beta = 3950;        // Beta coefficient of the NTC sensor
float tempNominal = 25;   // Nominal temperature (in °C)
float resistanceNominal = 10000; // Resistance at nominal temperature

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

void loop() {
  int analogValue = analogRead(sensorPin); // Read analog value from sensor
  float voltage = analogValue * (5.0 / 1023.0); // Convert to voltage
  float resistanceSensor = (5.0 - voltage) * resistance / voltage; // Calculate resistance

  // Calculate temperature using the Steinhart-Hart equation
  float tempKelvin = 1.0 / (1.0 / (tempNominal + 273.15) +
                            (1.0 / beta) * log(resistanceSensor / resistanceNominal));
  float tempCelsius = tempKelvin - 273.15; // Convert to Celsius

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

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

Troubleshooting and FAQs

Common Issues and Solutions

The STC 1000 does not power on:
- Check the power supply voltage and ensure proper wiring to terminals 1 and 2.
- Verify that the power source is functional.
Temperature readings are inaccurate:
- Ensure the NTC sensor is properly connected to terminals 7 and 8.
- Check for damage to the sensor or replace it if necessary.
- Use the temperature calibration parameter to fine-tune the readings.
Heating or cooling devices do not activate:
- Verify the wiring of the devices to the appropriate relay terminals.
- Check the setpoint and hysteresis settings to ensure they are configured correctly.
- Inspect the devices for faults or malfunctions.
The display shows an error code (e.g., "EE"):
- Refer to the STC 1000 user manual for specific error code meanings.
- Commonly, this indicates a sensor fault or disconnection.

FAQs

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 temperature probe?
- The probe can typically be extended up to 10 meters, but ensure proper shielding to avoid interference.
Can I use the STC 1000 for both heating and cooling simultaneously?
- Yes, the STC 1000 can control both heating and cooling devices, but they must be wired to their respective relay terminals.
Is the STC 1000 waterproof?
- No, the STC 1000 is not waterproof. Avoid exposing it to moisture or liquids.

This concludes the documentation for the STC 1000. For further assistance, consult the manufacturer's manual or contact technical support.