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.
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.
Open Project in Cirkit Designer
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.
Open Project in Cirkit Designer
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.
Open Project in Cirkit Designer
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.
Open Project in Cirkit Designer| Parameter | Specification |
|---|---|
| Operating Voltage | 110V AC or 220V AC (±10%) |
| Temperature Range | -50°C to 99°C (-58°F to 210°F) |
| Temperature Accuracy | ±1°C (±2°F) |
| Sensor Type | NTC (10kΩ) |
| Relay Output (Heating) | 10A at 220V AC |
| Relay Output (Cooling) | 10A at 220V AC |
| Power Consumption | ≤3W |
| 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 |
| Pin 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 | Connects to the NTC temperature sensor |
| 8 | Sensor Input | Connects to the NTC temperature sensor (polarity-independent) |
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
}
Device Does Not Power On:
Temperature Readings Are Inaccurate:
Relays Do Not Activate:
Display Shows Error Codes:
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.