How Temperature Display Circuit Works

How Temperature Display Circuit Works

  • By: Admin
  • Wed Mar 03, 2021
How Temperature Display Circuit Works

The temperature of the immediate atmosphere is determined by a temperature circuit, and the value is shown on a digital monitor. It's similar to an analogue thermometer, but it doesn't use mercury to determine the temperature. 

On the other hand, A temperature monitor circuit consists of a temperature sensor, a microcontroller, and a digital display. The temperature sensor measures the temperature value and transforms it to an analogue signal using electrical principles. The analogue signal is picked up and converted into digital values using a microcontroller. An op-amp is commonly used to amplify the analogue temperature value before feeding it into the microcontroller's ADC pin.

The current temperature value is shown on a monitor, which is typically an LCD or segment-LED. The temperature value can be expressed in decimal points depending on the sensor's resolution.

Sensors used for Temperature display circuit:

The basic definition of a temperature circuit is simple. That isn't to suggest you should start producing one by picking any temperature sensors you can find from a supplier. There are various types of temperature sensors come in a range of shapes and sizes, so pick one that best suits your needs. Common types of temperature sensors are:

1- Thermocouple: A thermocouple operates by measuring the offset in voltage between two different metal forms. It is non-linear, has a low precision, and can work over a large temperature range.

2- RTD (Resistance Temperature Detector): An RTD is a platinum wire wrapped around a ceramic or glass core that measures temperature. The resistance of the RTD varies in a generally linear scale as the temperature changes. It is extremely accurate, but it is not a cost-effective choice.

3- NTC Thermistor: An NTC thermistor works by varying its resistance in response to its temperature. It is extremely susceptible to even slight temperature variations. In relation to the temperature, the value varies on an exponential scale.

4- IC Sensors: Diodes are used to calculate temperature values in semiconductor-based sensors. Temperature-sensing ICs often provide an op-amp and output a digital or analogue signal with the temperature value.

You'll face various challenges in the PCB configuration depending on the type of temperature sensors you use. Thermistors such as thermocouples, RTDs, and NTCs generate analogue signals that correspond to temperature values. This necessitates a strong distinction between the analogue and digital components of the PCB.

It's important to keep the analogue and digital grounds apart so that no digital noise gets into the analogue temperature signal. Naturally, you'll want to make sure the analogue signal has a clear and direct path back to the analogue ground.

Using a semiconductor-based temperature sensor would obviously make the PCB design simpler. That isn't to suggest that you can take anything for granted. Even if the IC sensor generates an analogue output, the best practise of analog-digital separation must be followed. Being a prominent Nutronics manufacturing and suppliers in Delhi provides high quality of temperature controllers.