Temperature Candle Using LED

based projects require a lot of skill and hence only experienced
circuit designers try out these circuits. But there are also a few
circuits in this genre that can be done by amateur electronic hobbyists.
The temperature candle is one such circuit. Read on to know more about

The hardware components that are required to build this circuit are listed below:

  • Microcontroller
  • Temperature Sensor
  • PCB

The circuit design is pretty simple. The LED
is made to flicker by the microcontroller and the color is based on the
ambient temperature at that point. The temperature of the room can be
known by observing the color of the LED.

The temperature value is obtained in degree Celsius. This value is received as a result of pressing the reset button on the PCB.
This value can also be obtained by providing power to the device. Once
the device is powered up, the change in temperature is indicated. The
blue LED is triggered for a temperature increase of 10 degrees. The red LED is triggered for a temperature increase of a single degree.


Suppose, the ambient temperature is 23 degrees celsius, The circuit works in such a way that the blue LED is made to blink twice and the red LED is made to blink 3 times. Soon after this, an orange colored flicker is observed as the LED goes into canfle mode.

Since through hole components are used in this circuit, it is very
cheap to construct and the components can be easily soldered. The
circuit also contains a jack for connecting to a Microchip Pickit 3
programmer / debugger. This reduces the complexity involved in code
modification and download.

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