Temperature And Humidity Control Board THI380MB

1.Introduction to the THI380MB Temperature-Controlled Motherboard

This temperature and humidity control board utilizes advanced 32-bit MCU control technology, integrating functions such as fan drive, speed regulation, temperature monitoring, smoke detection, humidity monitoring, water immersion detection, low-temperature heating, high-humidity heating and dehumidification, low-temperature power-off protection, display backlight control, access control, RS-485 communication, and serial communication. The board detects environmental parameters including temperature, humidity, smoke, and water immersion within the cabinet through sensors, compares them with preset values, and automatically triggers actions like heating activation, fan operation, speed adjustment, power-off protection, and display backlight shutdown to ensure reliable and stable equipment operation. Additionally, the temperature control motherboard incorporates RS-485 and serial communication interfaces, enabling remote parameter reading and configuration via PC. Widely used in outdoor advertising systems, charging stations, base stations, and temperature-controlled enclosures for outdoor projectors requiring environmental monitoring and control, this solution provides comprehensive environmental management.

2.Electrical Specifications

1.Input Characteristics

2.2Output Characteristic

3.Interface Definition

3.1 Power Input Interface (CN18; KF128 Compression Terminal; 4P)

3.2 Fan Drive Interface 1 (CN1, CN2, CN3; XH-2.54mm Terminal; 4P)

3.3 Fan Drive Interface 2 (CN3A; DG330-5.0mm Screw Terminal; 4P)

	Pin	Pin name	Pin functions
	1	PWM	Fan speed control duty cycle
	2	TACH	Fan speed feedback input
	3	F4+	The fan drives the power supply output positive
	4	F4-	The fan drives the power supply output negative
	Remarks: The fan driver interface is located at CN3A and can be used as an expansion interface to drive more fans.

3.4 Analog Temperature Sensor Interface (CN12; XH-2.54mm Terminal; 2P)

	Pin	Pin name	Pin functions
	1	DAT	Data End
	2	GND	Ground

3.5 Analog Temperature Sensor Interface (CN10; XH-2.54mm Terminal; 2P)

	Pin	Pin name	Pin functions
	1	DAT	Data End
	2	GND	Ground

3.6 Water Immersion Sensor Interface (CN4; 2.54mm XH Terminal; 2P)

	Pin	Pin name	Pin functions
	1	/	The sensor has no polarity. When the water immersion sensor detects water leakage inside the cabinet (box), the two probes of the sensor are short-circuited. The control system cuts off the power supply and the fan stops running to ensure the power safety of the system inside the cabinet.
	2	/

3.7 Smoke Sensor Interface (CN11; 2.54mm XH Terminal; 3P)

	Pin	Pin name	Pin functions
	1	VCC	+5V power supply
	2	DAT	The smoke sensor data terminal is an analog switch with low-level validity. When the control system receives a low-level signal, power protection is activated and the fan stops running.
	3	GND	Grounding port

3.8 Backlight Control Output Interface (CN5; PH-2.0mm Terminal; 6P)

	Pin	Pin name	Pin functions
	1	GND	12V ground terminal
	2	GND	12V ground terminal
	3	ADJ	Backlight panel dimming signal terminal (DIMMING)
	4	O/F	The backlight panel switch signal, with a high level of 3.3V voltage
	5	VDD	12V positive cathode backlight power supply
	6	VDD	12V positive cathode backlight power supply

3.9 Backlight Control Input Interface (CN6; PH-2.0mm Terminal; 6P)

	Pin	Pin name	Pin functions
	1	GND	12V ground terminal
	2	GND	12V ground terminal
	3	ADJ	Backlight panel dimming signal terminal (DIMMING)
	4	O/F	The backlight panel switch signal, with a high level of 3.3V voltage.
	5	VDD	12V positive cathode backlight power supply
	6	VDD	12V positive cathode backlight power supply

3.10 Serial Communication Interface (CN13; PH-2.0mm Terminal; 4P)

	Pin	Pin name	Pin functions
	1	3.3V	+3.3V
	2	TX	Signal Sender
	3	RX	Signal receiver
	4	GND	Signal ground terminal

4. 1Key Instructions:

The CN15 provides a SET button for configuring the following parameters:

1: Display high-temperature protection temperature (display backlight off).

2: Display low-temperature protection temperature (display backlight off).

3: Fan startup temperature.

4: PWM duty cycle for fan speed control.

5: The starting temperature of the low-temperature heating device.

6: High-temperature power-off protection threshold (Note: For outdoor advertising applications, the power-off protection port may be omitted).

7: Low-temperature power-off protection temperature (Note: For outdoor advertising applications, the power-off protection port may not be connected).

4.2 Parameter Setting Range:

1) Low-temperature cooling temperature: preset temperature range: -5℃~+5℃, initial setting value is 0℃.

2) High-temperature protection (backlight off temperature): Pre-set temperature range: 50℃ to +70℃, with an initial setting of 60℃.

3) Low-temperature protection (backlight off temperature): Pre-set temperature range: -20℃ to -10℃, with an initial setting of -15℃.

4) Fan startup temperature: Pre-set temperature range: +20℃~+30℃, initial setting value is +25℃.

5) Fan PWM duty cycle: Pre-set range: 15% to 50%, with an initial setting of 20%.

The CN16 is the UP button. In the corresponding programmable state, each press of the UP button increases the temperature by 1℃ and the duty cycle by 1%. The CN17 pin serves as the DOWN button. In the corresponding programmable state, each press of the DOWN button reduces the temperature by 1°C and decreases the duty cycle by 1%.

4.3 Digital Display Description:

1) The default display simulates the sensor (position CN12) detecting the temperature inside the cabinet (box).

2) Press the CN15 (SET) button once to display the temperature detected by the analog sensor (located at CN10) inside the cabinet (box).

3) Press the CN15 (SET) button twice to display the current low-temperature start heating setting. Adjust the setting by pressing CN16 (UP) or CN17 (DOWN).

4) Press the CN15 (SET) button three times consecutively to display the current high-temperature protection setting (which turns off the display backlight). Adjust the setting by pressing CN16 (UP) or CN17 (DOWN).

5) Press the CN15 (SET) button four times consecutively to display the current low-temperature protection setting (which turns off the display backlight). Adjust the setting by pressing CN16 (UP) or CN17 (DOWN).

6) Press the CN15 (SET) button five times consecutively to display the current fan startup temperature setting. Adjust the setting by pressing CN16 (UP) or CN17 (DOWN).

7) Press the CN15 (SET) button six times consecutively to display the current fan PWM duty cycle setting. Adjust the setting by pressing CN16 (UP) or CN17 (DOWN). Pressing CN15 (SET) again returns to the current low-temperature startup heating setting, with continuous pressing cycling through steps 3) to 7). After 4 seconds of no button press, the digital display automatically returns to showing the cabinet (box) internal temperature monitored by the analog sensor (CN12).

4.4 Parameter Setting Example of Digital Display

1) Display the current cabinet temperature (or on the display). The digital display shows 0025, indicating 25°C.

2) Initial heating setpoint for low-temperature startup: The digital display shows 1000, indicating the initial setpoint is 0°C. Press CN17 (UP) or CN16 (DOWN) to adjust the setpoint.

3) The high-temperature protection temperature (display backlight off) has an initial setting of 60°C, indicated by the digital display showing 2060. The setting can be adjusted by pressing the UP (CN17) or DOWN (CN16) keys.

4) The low-temperature protection temperature (display backlight off) has an initial setting range of 3-15°C, where a display value of 3 indicates -15°C. The preset can be adjusted by pressing the UP (CN17) or DOWN (CN16) buttons.

5) Fan drive temperature initial setting: The digital display shows 4025, indicating the initial setting is 25℃. Press CN17 (UP) or CN16 (DOWN) to adjust the setting.

6) The PWM duty cycle initial setting for the fan is 50.20 (displayed on the digital tube), indicating a 20% duty cycle. Adjust the setting by pressing the UP (CN17) or DOWN (CN16) buttons.

4.5 System Alarm Digital Display Example

1) Sensor-free alarm: The digital display shows 01. This error code indicates the system is not connected to a temperature and humidity sensor.

2) Water ingress alarm: The digital display shows the code 02, indicating that the system has detected water intrusion inside the cabinet (box).

3) High and low temperature protection alarm: The digital tube displays the value -03, indicating that the internal temperature of the cabinet (display screen) or box has reached or exceeded the preset high and low temperature protection temperature.

The THI380MB features two temperature sensors, designated CN12 and CN10 respectively. These sensors must operate in coordination to enable the temperature
control motherboard's functionality. (Ensure proper positioning of the sensor probes by clearly understanding their respective functions during operation.)
1.CN12 sensor is responsible for the system fan speed control and temperature parameter acquisition. The main control chip adjusts the fan speed according to the temperature parameters of the environment or display screen detected by the sensor.
2. The CN10 sensor monitors temperature parameters for system protection. The main control chip compares the detected environmental or display screen
temperature with preset system parameters, then activates the backlight control interface, high/low-temperature relays, and low-temperature heating relays.These
actions include turning off the screen backlight, disconnecting AC power input, and activating low-temperature heating systems to ensure equipment protection.
the function of.

7. Physical Size

Dimensions: 120mmx80mmx22mm (L x W x H)
Positioning hole size: 110mmx65mm
Positioning hole diameter: 4xɸ3.7mm