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An expert's guide to selecting temperature sensors and switches for SA electronics projects. Types, specs, circuit tips, and where to find reliable stock at Communica.
Compare thermistors, thermocouples, digital ICs, and switches for typical use cases.
How to choose the right sensor or switch, including circuit tips and real-world examples.
Find stocked sensor brands, advice on lead times, and collection at South African branches.
Temperature sensors and switches are essential components in electronics-from basic thermal monitoring to advanced process control and protection. Makers, students, and industrial engineers rely on these versatile devices to monitor heat, enable auto-shutdowns, and log environmental data in projects across South Africa.
This guide introduces common temperature sensor and switch types, compares their specs, details when to use each, and gives you practical advice for sourcing and integrating them into your electronics builds.
| Type | How It Works | Typical Range | Applications |
|---|---|---|---|
| NTC/PTC Thermistors | Resistance changes with temperature | -50 degreesC to +150 degreesC | Battery packs, 3D printers, HVAC, DIY |
| Thermocouples (Type K, J, etc.) | Voltage generated at hot junction | -200 degreesC to +1300 degreesC | Industrial, kilns, exhaust gas, process |
| Digital IC (e.g., DS18B20, LM75) | Semiconductor outputs calibrated data | -55 degreesC to +125 degreesC | Arduino, data logging, IoT, HVAC |
| Temperature Switch (Thermostat) | Mechanical contact opens/closes at set point | -20 degreesC to +130 degreesC (typ.) | Overtemp cutoff, appliances, safety |
Suppliers such as Adafruit, Amphenol, and Honeywell offer a variety of sensor and switch options locally. Lead times vary: common NTC thermistors and digital sensors are usually in stock at Samrand, while certain thermocouples may require ordering, with 2-6 week lead times typical.
An NTC thermistor forms a voltage divider with a fixed resistor. The voltage at the divider changes as temperature shifts.
--- +3.3V | [NTC] | +------ A/D pin (microcontroller) | [10kOhm] | GND
Calculate the temperature using the Steinhart-Hart equation if high accuracy is needed, or with a simple beta formula for quick projects:
1/T = 1/T + (1/beta) x ln(R/R)
Where T = temperature in Kelvin, beta = material constant, R = current resistance, R = resistance at T.
Thermal switches provide a simple way to protect electronics by opening/closing a circuit when the preset temperature is reached.
| Switch Type | Action | Typical Use |
|---|---|---|
| Bimetal Switch | Opens or closes at temperature (e.g., 85 degreesC) | Overheat safety for motors, power units |
| Solid-State Switch | Electronic output at set point | Precision thermal cutoff in digital circuits |
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He's polite, good with people and made me feel free to talk.. all in all he's helpful
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Sydney and Nicole were absolutely fantastic and helped me with my purchases. Thank you.
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Needed to buy a bluetooth GPS receiver. The staff was friendly, knowledgeable and assisted without any issues. This is a toys tore of note for peopl...
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They have mostly any electronic tool and components that you may require - Thanks to Nicole for helping me.
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The service was excellent, Nicole and Rehaan were very helpful and professional in their work.
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Mohamed Sharief is a great asset to Communica. He provides a 5 star service and good product knowledge. Keep up the good work.
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Quick quality customer service.
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Very good service and a happy welcoming smile from the cashier Nicole
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Verified customerGreat service
Verified customerSydney en Lacy was baie hulpvaardig. Goeie diens!
Verified customerNicolene
Verified customerGreat place to purchase electronic components at a fair price. They have a wide range of products and a well functioning ticketing system that ensures...
After being supplied the incorrect track for my garage motor, despite me asking twice if it was the correct track, I had to return to the store to exc...
They have most every electronics component you might need. Staff are knowledgeable and friendly. I was looking for a bespoke miniature item for a lapt...
Great service as always from Nicole and Sydney especially Mpho at the sales desk
Verified customerGood Array of products and sound advice
Verified customerGreat inventory. Very slow service, though the staff seem to do their best. Single till open mostly with overbearing security measures. Can do with so...
I visit Communica once in a blue moon. Always wish i have more time to look at everything. Good & friendly service. Nothing wrong with a queuing syste...
Currently have only purchased items from their on-line store. Received what I ordered plus quick delivery. No complaints to date.
Verified customerThe new ticketing system is great, but the queues are still exceedingly long, and there are hardly any staff on hand in the shop to assist with questi...
I needed a heat-sensitive diode as one of my Philips appliances had had a failure. Philips wants you to throw the entire thing away, but I tried look...
I got the most pleasant service from Sydney and Windie
Verified customerExcellent range of items, with technical staff that know their stuff. Unfortunate location that makes it a bit difficult to get to, but worth the tre...
Wide range of electronic components. Very likely to find what you are looking for. Arthur was very helpful. Don't bother trying to call for informatio...
Great place. Reasonable prices. Keeps component level items as well as security, surveillance and electrical items and tools
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Great pricing and a wide variety of products to choose from. A must visit if you've ever been to the Pretoria branch.
Verified customerNicole was very helpfull and friendly.
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Verified customerSlowest service ever! Even worst cashiers. I shudder to go. Good products though.
Verified customerGood service, would recommend.
Verified customerWide range of electronics for the diy enthusiastic, ranging from solar systems to alarms and cctv.
Verified customerGreat for electronics but stock is a problem quite often so call before going through.
Verified customerService has improved but still a long way to go to actually sort it out.
Verified customerFriendly service and a vast range of electronic components, devices etc.
Verified customerThe is a computerised quing system and you can pick n pay....but the problem is the is no lift and the only way to get up is using steps
Verified customerFor Sonoff ewelink WiFi switch.
Verified customerThank you for your patience ma'am Mpho
Verified customerGood verity of products. Helpful staff albeit a bit slow
Verified customerLots and lots of interesting things here. From home security to robots to electronic kits. Always like coming here.
Verified customerGreat service from Cynthia and Nicole
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Verified customerSomethings are getting pricey, but still a good place to pick up components
Verified customerNicole and Sydney were very helpful
Verified customerElectronic store for DIY electronics and prototyping guys. Doesn't look all that great but should have what you're looking for.
Verified customerA good electrical/electronic sales store packed with almost every component you require
Verified customerIf you love engineering you'll love this shop apart from the terrible queues and long waiting times
Verified customerAlmost all electronic spares available at reasonable prices.
Verified customerVery fast and friendly service, avoid it in friday afternoon if possible.
Verified customerExcellent, ask for Sydney. Solved immediately
Verified customerThey have everything you would need. Service is good
Verified customerBig electronic component shop. Counter can be very busy. Lots of parking.
Verified customerClose to closing time so i was in and out quickly
Verified customerAll the goodies in one place and Mohamed is always willing to help
Verified customerWide variety of electronic goods. Staff helpful with good advise.
Verified customerGood verity, lots of stock, mostly helpful staff
Verified customerVery helpfull. Thank you
Verified customerWide variety of components and electronic goods. Helpfull personel.
Verified customerExcellent service Nicole
Verified customerLarge selection, low on staff during lunch time when they are busy.
Verified customerGreat for your electronic needs - Prices are a bit expensive
Verified customerGreat showroom, electronics hobbyist's paradise
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Verified customerDefinitely will have what you're looking for.
Verified customerCheap electronics and great educational goodies for the kids
Verified customergood selection of electronic supplies accessible
Verified customerGreat variety of stock on hand
Verified customerGood variety of electronic components available
Verified customerWide variety of electronic supplies available here
Verified customerVery good
Verified customerBig variety and good prices
Verified customerAll your electronics requirements under one roof, and more!
Verified customerThe place to go whatever your electrical and electronics needs.
Verified customerExcellent range of electronic products
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Verified customerGreat electronics and hobbiest shop
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Verified customerLove everything here...
Verified customerGood range of products
Verified customerWhatever you need they have
Verified customerLarge number of electronic components
Verified customerCan spend hours in there
Verified customerRather a slow process
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Verified customerWaiting time can be annoing.
Verified customerCommunica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
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