A temperature measurement and control circuit is a common electronic application that is used in many different fields, including HVAC systems, industrial control systems, and home automation. In this article, we will discuss a simple temperature measurement and control circuit schematic diagram.
The basic temperature measurement and control circuit consists of a temperature sensor, a microcontroller or programmable logic controller (PLC), and a relay. The temperature sensor is used to measure the temperature of the environment, and the microcontroller or PLC is used to process this information and make a decision based on a pre-programmed setpoint. The relay is used to control the output of the circuit, such as a heater or air conditioning unit.
Here is a simple schematic diagram of a temperature measurement and control circuit:
Let’s take a closer look at each of the components in this circuit:
Temperature Sensor:
- The temperature sensor used in this circuit is a thermistor. A thermistor is a type of resistor that changes its resistance with changes in temperature. The resistance of the thermistor is measured using the microcontroller or PLC to determine the temperature of the environment.
Microcontroller or PLC:
- The microcontroller or PLC used in this circuit is responsible for processing the temperature sensor data and making a decision based on a pre-programmed setpoint. If the temperature is below the setpoint, the microcontroller or PLC will turn on the relay, which in turn will activate the heater. If the temperature is above the setpoint, the microcontroller or PLC will turn off the relay, which will turn off the heater.
Relay:
- The relay used in this circuit is a single-pole, single-throw (SPST) relay. The relay is used to control the output of the circuit, such as a heater or air conditioning unit. When the microcontroller or PLC turns on the relay, the heater will be activated, and when the microcontroller or PLC turns off the relay, the heater will be deactivated.
Power Supply:
- The power supply used in this circuit is a DC power supply. The power supply is used to provide power to the microcontroller or PLC, the temperature sensor, and the relay.
In this simple temperature measurement and control circuit, the temperature sensor measures the temperature of the environment and sends this data to the microcontroller or PLC. The microcontroller or PLC compares the temperature to a pre-programmed setpoint and makes a decision based on this comparison. If the temperature is below the setpoint, the microcontroller or PLC turns on the relay, which in turn activates the heater. If the temperature is above the setpoint, the microcontroller or PLC turns off the relay, which turns off the heater.
Overall, a temperature measurement and control circuit can be a very useful tool in controlling the temperature of an environment. By understanding the components and their functions, you can design and build a simple temperature measurement and control circuit to suit your needs.
