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Heat Activated Switch

2
Easy Build
Exclusive to Kitronik
Teaching Notes
Key Stage 3
The Temperature Switch Kit detects the temperature of its surroundings using a thermistor. The kit acts as an automated on/off switch (temperature dependable).

Availability: In Stock.

Code1+ 5+ 50+
2113£2.00
(£2.40 incl VAT)
£1.45
(£1.74 incl VAT)
£1.15
(£1.38 incl VAT)
OR

This temperature activated project kit is also available as a light activated project kit. The output of this board can be used to control other electronic circuits, turning them on automatically when it goes hot or cold.

The board has space for an LED with current limit resistor (both available separately) which will light when the output turns on.

The Darlington pair transistor configuration allows an output current of up to half an amp to be controlled. Operating voltage 3V to 10V (lower voltages allow for better adjustment of the switching point).

Features:

  • The Temperature Switch Kit detects the temperature of its surroundings using a thermistor.
  • The kit acts as an automated on/off switch (temperature dependant).

Contents:

Possible applications include:

  • Babies bath over temperature indicator.
  • Automatic fan.

Dimensions:

  • PCB Length: 53mm.
  • PCB Width: 25.5mm.

Requires:

Resources:

Note:

  • This kit requires soldering.

Free samples:

Teachers can order a sample of this kit (one per school) here. You will need to select the kit from a list of all the sample kits; the stock code for this kit is 2113.
Note: this service is only offered to schools for evaluation purposes only.

Buy British:

 This kit is designed and manufactured in the UK by Kitronik.

potential-divider-voltage-divider-whiteboard-150
How A Potential Divider / Voltage Divider Works
A guide to understanding how a Potential Divider / Voltage Divider works. What is a Potential Divider / Voltage Divider? This is a simple circuit which takes advantage of the way voltages drop across resistors in series.
automatic_fan_thumb
How to Make a Heat Activated Fan
Learn how to make a heat activated fan/cooler in our easy to follow tutorial.
bath_temp_thumb
How to Make a Babies Bath Over Temperature Indicator
Learn how to make a babies bath over temperature indicator in our easy to follow tutorial.

Questions:

Posted by Scott, Tuesday, 19 July 2016 on product Heat Activated Switch

Question:

Hi. I placed and order for this item. Could you also send me the LED and R3? How much are these? I will pay you via PayPal for these. Thanks.

Answers:

  • Posted by Michael Lockhart on Tuesday, 19 July 2016

    Hi Scott, Unfortunately I believe your order for this item has already been dispatched, and as such no changed can be made to this. With regards to the cost of the LED and R3 it would depended on which Led you wanted to us to which resistor is needed. If you find an LED you would want to use then if you use the LED calculator section on the product page for the LED you will be able to calculate the resistor value you would need.

Posted by kentarou, Tuesday, 10 November 2015 on product Heat Activated Switch

Question:

I'm a Japanese college student. That Heat Activated Switch was bought this time. I'd like to know the model number of the thermistor used for Heat Activated Switch.So,could you tell me?

Answers:

  • Posted by Michael Lockhart on Tuesday, 10 November 2015

    The thermistor that is used in the heat activated switch kit is the 4.7K ohm Thermistor, https://www.kitronik.co.uk/c3006-4k7-47k-thermistor.html

Posted by Ian Soady, Friday, 13 February 2015 on product Heat Activated Switch

Question:

Hi there. I'm thinking about building a system to automatically switch on heated screen washers in may car. It needs to come on at around 0 degrees (temperature falling) and off again as temperature rises past 0. It doesn't need to be terribly accurate. Would this kit do the job? Many thanks

Answers:

  • Posted by Michael Lockhart on Friday, 13 February 2015

    Yes this kit would be fine to use for this purpose.

Posted by Kaare Dorman, Monday, 24 November 2014 on product Heat Activated Switch

Question:

What it the temperature range? Can the thermistor be mounted remotely? I need something like this to automatically turn on a cooling fan in my paintball mask.

Answers:

  • Posted by Aaron Sturman on Monday, 24 November 2014

    The temperature range can be varied with the on board potentiometer. The thermistor can be connected on leads. The temperature range varies a bit from kit to kit as the resistors are only accurate to 5%, however it definitely covers -10C to 40C.

Posted by Rob Edwards, Monday, 6 October 2014 on product Heat Activated Switch

Question:

I'm looking in to building a light for a propane barbeque to show the burner is on. I wanted to do a heat sensor and a simple LED to be mounted on the unit....would these work? What temps can the current sensor handle? And if the temps are too low is there an option for a higher temp. I can find a US company with a comparable kit so I'd order a batch to cut down the shipping costs if they would work....what do you think? Thanks Rob

Answers:

  • Posted by Geoff Hampson on Monday, 6 October 2014
    The thermistor is rated to 125 degrees, so wouldn't even be up to the job of measuring the air temperature in the BBQ let alone what the temperature of the burner was. I would have thought that you would be best using the same technology as they do in gas boilers for detecting if the pilot is on .i.e. a thermocouple.

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