The ‘ *‘ key of the keypad is used to clear the value entered during the temperature setup and the ‘ #‘ key is used to ENTER (save) the setting. The LM35 precision analog temperature sensor chip is connected to the analog input pin AN0 (RA0). An LCD display shows the measured temperature continuously.įigure 2 shows the circuit diagram of the project. If on the other hand the measured value is higher than the desired value, then the fan is switched ON to cool off the area until the required temperature is reached. The heater is switched OFF once the desired temperature is reached. If the desired value is higher than the measured value, then the heater is turned ON to heat the area. The microcontroller reads the temperature every 10 s and compares it with the desired value. The temperature of the area is measured using an analog temperature sensor, the LM35 precision integrated-circuit temperature sensor is used for this.įigure 1: Automatic Temperature Control Block diagram The desired temperature setting is entered using a keypad. Figure 1 shows the block diagram of the system to be designed. This area could be a small plant, a house or any place or device that require a controlled temperature like an incubator (egg) for example. This project uses a PIC microcontroller to automatically control the temperature of an area. The primary purpose is to manage the temperature of a given area based on settings by a user of the system. An automatic temperature control system has the ability to monitor and control the temperature of a specified space without human intervention.
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