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).
- The Temperature Switch Kit detects the temperature of its surroundings using a thermistor.
- The kit acts as an automated on/off switch (temperature dependant).
- 1 x 47KΩ Potentiometer.
- 2 x BC337 NPN Transistors.
- 1 x Thermistor.
- 1 x 220Ω Resistor.
- 1 x Heat Activated Switch PCB
Possible applications include:
- Babies bath over temperature indicator.
- Automatic fan.
- PCB Length: 53mm.
- PCB Width: 25.5mm.
- This kit requires soldering.
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.
This kit is designed and manufactured in the UK by Kitronik.
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.
Learn how to make a heat activated fan/cooler in our easy to follow tutorial.
Learn how to make a babies bath over temperature indicator in our easy to follow tutorial.
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.
Posted byon 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.
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?
Posted byon 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
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
Posted byon Friday, 13 February 2015
Yes this kit would be fine to use for this purpose.
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.
Posted byon 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.
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
Posted byon Monday, 6 October 2014The 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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