The STC-1000 is a versatile digital temperature controller manufactured by BOE (Part ID: BOE). It is widely used for regulating temperature in a variety of applications, including incubators, refrigerators, aquariums, and fermentation chambers. The device features a dual relay output for controlling both heating and cooling systems, a digital temperature display, and user-adjustable set points for precise temperature management. Its compact design and ease of use make it a popular choice for both hobbyists and professionals.
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 DesignerThe following table outlines the key technical specifications of the STC-1000:
| Parameter | Specification |
|---|---|
| Operating Voltage | AC 110V-220V ±10% |
| Temperature Range | -50°C to 99°C (-58°F to 210°F) |
| Temperature Accuracy | ±1°C |
| Sensor Type | NTC (10kΩ) Thermistor |
| Relay Output (Heating) | 10A at 220V AC |
| Relay Output (Cooling) | 10A at 220V AC |
| Power Consumption | ≤3W |
| Display Type | LED (3-digit) |
| Operating Temperature | -10°C to 60°C |
| Storage Temperature | -20°C to 75°C |
| Dimensions | 75mm x 34.5mm x 85mm |
The STC-1000 has a total of 8 terminals for wiring. The table below describes each terminal:
| Terminal Number | Description |
|---|---|
| 1 | Power Input (Live/Hot wire) |
| 2 | Power Input (Neutral wire) |
| 3 | Cooling Relay Output (Live/Hot wire) |
| 4 | Cooling Relay Output (Neutral wire) |
| 5 | Heating Relay Output (Live/Hot wire) |
| 6 | Heating Relay Output (Neutral wire) |
| 7 | Temperature Sensor Input (NTC Thermistor) |
| 8 | Temperature Sensor Input (NTC Thermistor) |
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 Arduino sketch to read the temperature from the STC-1000's NTC sensor:
// Example code to read temperature from an NTC thermistor connected to Arduino
// Note: This assumes the NTC thermistor is connected to an analog pin (e.g., A0).
const int sensorPin = A0; // Analog pin connected to the NTC thermistor
const float seriesResistor = 10000.0; // Resistor value in series with the thermistor
const float nominalResistance = 10000.0; // Resistance of the thermistor at 25°C
const float nominalTemperature = 25.0; // Nominal temperature in Celsius
const float betaCoefficient = 3950.0; // Beta coefficient of the thermistor
void setup() {
Serial.begin(9600); // Initialize serial communication
}
void loop() {
int analogValue = analogRead(sensorPin); // Read the analog value
float voltage = analogValue * (5.0 / 1023.0); // Convert to voltage
float resistance = (5.0 - voltage) * seriesResistor / voltage; // Calculate resistance
// Calculate temperature using the Steinhart-Hart equation
float steinhart;
steinhart = resistance / nominalResistance; // (R/Ro)
steinhart = log(steinhart); // ln(R/Ro)
steinhart /= betaCoefficient; // 1/B * ln(R/Ro)
steinhart += 1.0 / (nominalTemperature + 273.15); // + (1/To)
steinhart = 1.0 / steinhart; // Invert
steinhart -= 273.15; // Convert to Celsius
Serial.print("Temperature: ");
Serial.print(steinhart);
Serial.println(" °C");
delay(1000); // Wait 1 second before the next reading
}
No Power to the STC-1000:
Temperature Reading is Inaccurate:
Heating or Cooling Device Not Activating:
Display Shows Error Codes:
By following this documentation, users can effectively utilize the STC-1000 for precise temperature control in various applications.