The **JT-01A-R** is a specific model of an **LCD Digital Temperature and Humidity Controller** (often utilized in egg incubators, pet enclosures, and green rooms). It functions as a dual-relay output system designed to maintain environmental stability. --- ### 1. Key Technical Specifications The device operates on low-voltage DC power and uses a digital sensor to monitor real-time environmental data. | Component | Specification | | :--- | :--- | | **Operating Voltage** | DC 12V (standard) | | **Output Type** | Dual Relay (1 for Temperature, 1 for Humidity) | | **Temperature Range** | -20°C to 60°C | | **Humidity Range** | 0% to 100% RH | | **Load Current** | 10A Max per relay | | **Display** | High-definition LCD with blue/white backlight | --- ### 2. Main Electronic Modules The JT-01A-R consists of several core stages within its PCB architecture: #### A. Microcontroller Unit (MCU) The "brain" of the device. It receives digital signals from the sensor, compares them against the user-defined setpoints, and sends signals to trigger the relays. #### B. The Sensor (SHT20 or similar) The device usually comes with a remote probe. - **Type:** Digital Capacitive Humidity & Thermistor Temperature. - **Communication:** I2C or specialized digital protocol to ensure no data loss over the cable length. #### C. Relay Control Stage There are two mechanical relays on the board: - **Heating/Cooling Relay:** Switches power to a heater or a fan. - **Humidify/Dehumidify Relay:** Switches power to an ultrasonic mister or a dryer. #### D. Power Management Includes a voltage regulator (usually a 78L05 or similar) to step down the 12V input to 5V or 3.3V for the MCU and LCD. --- ### 3. Connection Interface The back of the unit typically features a terminal block. Below is the standard electronic pinout: ```markdown Terminal Layout: [ +12V ] -> Power Input Positive [ GND ] -> Power Input Negative [ SENS ] -> 3 or 4-pin Sensor Connector [ T-RLY] -> Temperature Relay Contacts (Common/Normally Open) [ H-RLY] -> Humidity Relay Contacts (Common/Normally Open) ``` --- ### 4. Operational Logic The electronic logic follows a **Hysteresis** model: 1. **Set Point:** Target value (e.g., 37°C). 2. **Backlash/Differential:** The range before the relay clicks back on (e.g., 0.5°C). 3. **Safety:** The MCU includes a delay function to prevent the relays from "chattering" (rapidly switching on/off), which protects the electronic life of the compressor or heater attached. ---