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Comprehensive guide to temperature sensors and switches in South Africa for makers, students and engineers. Selection, wiring, calculations and local procurement tips.
Compare thermistors, RTDs, thermocouples and digital sensors for common use cases.
Voltage dividers, excitation for RTDs, and simple wiring diagrams for hobby builds.
Check stock, branch collection, VAT invoicing and lead times for South African projects.
Temperature sensors and switches are essential for projects from climate control and data logging to motor protection and battery management. This guide covers common sensor types (thermistors, RTDs, thermocouples, digital sensors) and mechanical/electrical switches, explains selection criteria, and shows practical wiring and calculation examples relevant to the South African context. The primary keyword for this guide is temperature sensors and switches in South Africa and it appears throughout to help you find locally relevant advice.
Sensors report temperature in degrees Celsius (C). Key specs to compare are accuracy (± degrees), resolution, response time, operating range, and output type (analogue resistance/voltage or digital). For projects needing calibrated readings, choose sensors with specified accuracy over your operating range and consider calibration against a traceable reference. See our how to calibrate a temperature sensor guide for methods and best practices.
| Type | Typical Range | Typical Accuracy | Output |
|---|---|---|---|
| NTC Thermistor | -40 to 150 C | ±0.1C to ±2C (varies) | Resistance |
| PT100 / PT1000 (RTD) | -200 to 600 C | ±0.1C to ±1C | Resistance (requires excitation) |
| Thermocouple (Type K) | -200 to 1260 C | ±1C to ±3C | mV (needs amplifier) |
| Digital (DS18B20, I2C) | -55 to 125 C | ±0.5C typical | Digital (1-Wire, I2C) |
Communica stocks a wide range of sensor types and maker-favourite brands suitable for South African projects. For browsing parts and categories, check the shop by category page Collections. To understand the company background and distribution footprint, see the about page About Us.
When selecting temperature sensors and switches in South Africa, consider these practical factors: required accuracy, sensor placement and mounting, electrical interface (analogue vs digital), environmental protection, lead times and branch pickup. Check local stock and branch hours on the branches page Branches & Trading Hours before planning procurement for classes or projects.
Ohm's Law and power calculations are often needed when using thermistors and RTDs in voltage-divider circuits or when driving heaters and switches. Key formulas:
Example: NTC in a divider to measure with an ADC on a 3.3V microcontroller. Choose a fixed resistor Rfixed near the NTC nominal resistance to maximise ADC resolution at the target temperature range.
ADC_voltage = 3.3 * (Rfixed / (Rfixed + Rntc))
For RTDs, use a stable current source (excitation) and measure voltage. Example: PT100 with 1mA excitation gives 100mV at 0C; ensure ADC and amplifier input ranges accommodate the voltage and common-mode levels.
Simple NTC voltage divider to ADC (single-ended):
3.3V --- Rfixed ---+--- ADC input
|
Rntc
|
GND
DS18B20 1-Wire wiring (parasite power possible but recommended to use VCC):
3.3V ---+--- VCC (DS18B20)
|
+--- 4.7k pull-up resistor --- Data line --- MCU GPIO
GND ------------------------------ GND
When specifying sensors for teaching labs or production prototypes, factor in local availability and lead times. Use Communica's all-products index All Products and shop by brand Shop by Brand to assemble parts lists. For larger purchases, plan for VAT invoicing and branch collection-Communica supports quotes and account invoicing for education and procurement teams.
1) Simple greenhouse monitor: DS18B20 sensors (one per zone), ESP32 node, and 4.7k pull-ups. Use the digital sensors for easy wiring and MQTT reporting.
2) Motor overheat protection: PT100 with a dedicated RTD amplifier and an electronic temperature switch output to a contactor. Specify the RTD class and excitation to meet accuracy targets.
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Review for Communica Samrand Security Wanted to share a heartfelt thank you to the security team at Communica Samrand! Yesterday, I had a personal ex...
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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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One of the cashier services rendered to me was here at communica by the lady named Nicole and her manager dolly they were both willing to go above and...
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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I received a great service from Rehaan, Windy and Nocole. Excellent customer service.
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Quick quality customer service.
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Verified customerPatient and kind
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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...
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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.
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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
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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
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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
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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
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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 customerVery helpful and professional
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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
Verified customerExcellent merchandising
Verified customerGood products
Verified customerHelpful and efficient
Verified customerPlace if definite interest
Verified customerGet electronic kits
Verified customerWide range of components
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Verified customerElectronic components wholesaler
Verified customerloads of electronic components
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Verified customerCool
Verified customerhuge selection
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Verified customerFascinating
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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