Asked by: Diane Brancazio
Quick links
Buy locally from a partner
Bundled options
Kitronik Heat Activated Switch plus wire cutters
+
Kitronik Heat Activated Switch plus wire cutters and soldering starter kit
+
+
Description
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:
- 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.
Dimensions:
- PCB Length: 53mm.
- PCB Width: 25.5mm.
Requires:
Note:
- This kit requires soldering.
Free samples:
Teachers can order a sample of this kit (one per school) request a sample kit.
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 product is designed and manufactured in the UK by Kitronik.
Same Day Dispatch
- Orders placed online before 3:00pm Monday - Friday (excluding public holidays and our Christmas shutdown period) are always dispatched the same day provided the goods are in stock. If the goods are not in stock we will endeavour to contact you as soon as possible to discuss a dispatch date.
UK Deliveries
- If you live on the UK mainland and don't have any large materials or lithium batteries in your order it will cost £3.95 (£4.74 including VAT) if you spend less than £40 (£48 including VAT).
- If you spend between £40 and £200 (£48 - £240.00 including VAT, excluding large materials or lithium batteries) delivery is free to most locations, £12 (£14.40 including VAT, excluding large materials or lithium batteries) to Northern Ireland and £15 (£18.00 including VAT, excluding large materials or lithium batteries) to UK remote locations. For a list of postcodes that will be charged the remote location rate: remote area list.
- If you spend over £200 (£240.00 including VAT, excluding large materials or lithium batteries) delivery is free within the UK.
Rest of the world
- These orders are sent via UPS, and the cost is dependant on the service you choose at checkout. Alternatively you can choose the free collection option and have your own courier collect it from us. International orders can only be shipped to the registered card address. Please note: International orders may be charged import duty dependant on local import laws and duty rates. These charges are usually billed to you directly from UPS.
- Delivery times vary for international orders depending on the service selected and the destination. You can see the delivery time and cost at the shipping stage, or by using the shipping estimator from within the shipping basket.
Collection
- If you would like to collect your order, or use your own courier then there is an option you can select during checkout. We do not charge a packaging or handling fee for this service, and you will receive an email when your order has been processed, you can collect half an hour after receipt of this email.
Further Information
- For information about all of the delivery options we offer see full delivery details.
How to solder - an introductory guide: If you're new to soldering our Soldering School will have you up and running in no time. What is soldering? Soldering is a...
How to solder - an introductory guide: If you're new to soldering our Soldering School will have you up and running in no time. What...
Q:
What voltage is required to run this circuit? Can I use the 3V Coin Cell battery board?
A:
Hi Diane,
Thank you for your message the kit can run from 3V to 10V. So a Coin cell would work with this but you might be limited by it's low charge running down after a short time (about 6 hours with a standard LED turned on by the kit).
Best Regards
Cullen
Answered by: Cullen Lewis
01-Mar-19
Q:
Is a 12volt battery too powerful for the components in the switch?
I would like to use this to power a small fan in an equally small greenhouse but the battery will be charged using a small solar panel.
I asked this question using the light switch yesterday as example but have not had any reply as yet
Thanks
Asked by: Anthony Morris
A:
Hi Anthony, The components on this kit has a slightly lower voltage than on the light activation kit. As such this kit can only be powered by a maximum of 10V. You could use a step down regulator to take the voltage down below 10V.
Answered by: Michael Lockhart
27-Mar-18
Q:
Hi, I would like to put leads on the thermistor to use in a solar batch heater I am making, what distance away from the board could the leads be and still work? I am thinking of using the kit to turn on the gas water heater when the solar water is cool, the heater uses a 1.5 D battery to light the gas. I am guessing the heater's system needs the ampage a D cell provides so I want to hack into the Dcell compartment , cut the link and run it to a relay worked by the kit. If that sounds possible could you advise on a suitable relay. regards steve ps I do have another question regarding this kit in either configuration, could it be used to detect a specific voltage on 1 to 3 rechargeable 1.2 volt batteries and switch off . I would like to make a solar lamp that will give out some useful light but do not want to completely empty the battery/ batteries every night.
Asked by: steve
A:
Hi Steve, The maximum lead length would depend on the resistance of the type of w
ire being used but it would be somewhere in the hundreds/thousands of feet range. That sounds like it should be workable. I don't know the exact details of the heater and its tolerances for lighting the gas but if you powered the temperature switch kit with 2 D batteries it would output roughly 2V at up to 0.5A which I expect would be plenty for your heater if it is currently running from 1 D battery. (0.9V is lost through the transistor pair on the board.) So you might not need a relay. You could use this relay though http://www.kitronik.co.uk/products/components/relays/5v-relay-single/ but you would need to use 4xAA batteries with the temperature kit to trigger the relay. For your final question I would not recommend using this board to measure a specific voltage, the drop over the darlington pair is about 0.9V which is a massive proportion of the 1.2V your batteries provide. You would be better off using a voltage divider circuit and a single transistor.
ire being used but it would be somewhere in the hundreds/thousands of feet range. That sounds like it should be workable. I don't know the exact details of the heater and its tolerances for lighting the gas but if you powered the temperature switch kit with 2 D batteries it would output roughly 2V at up to 0.5A which I expect would be plenty for your heater if it is currently running from 1 D battery. (0.9V is lost through the transistor pair on the board.) So you might not need a relay. You could use this relay though http://www.kitronik.co.uk/products/components/relays/5v-relay-single/ but you would need to use 4xAA batteries with the temperature kit to trigger the relay. For your final question I would not recommend using this board to measure a specific voltage, the drop over the darlington pair is about 0.9V which is a massive proportion of the 1.2V your batteries provide. You would be better off using a voltage divider circuit and a single transistor.
Answered by: Aaron Sturman
13-May-07
Ask a question about this product
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.