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Learn how temperature sensors like thermistors and RTDs influence circuit operation, accuracy, and reliability. Get tips on sensor choice, integration, and sourcing in South Africa.
Understand how thermistors, RTDs, and IC sensors affect circuit operation and accuracy.
Explore wiring, calibration, and placement to optimize sensor integration in circuits.
Find popular temperature sensor brands and practical supply advice for projects in South Africa.
Temperature sensors are found in nearly every modern electronic system-monitoring component heat, protecting devices, or giving environmental feedback. In South African contexts, where temperature swings can impact reliability, selecting and integrating temperature sensors is critical for both students and industry professionals.
However, every sensor added to a circuit changes its electrical characteristics in subtle ways. This guide covers not only how temperature sensors influence circuit performance but also how to select, wire, and deploy them for the most accurate and stable operation.
The three main sensor types commonly used in local builds are:
Each sensor impacts the circuit differently:
| Sensor Type | Output Signal | Sensitivity | Typical Accuracy | Power Draw |
|---|---|---|---|---|
| NTC Thermistor | Resistance (ohms) | High | 0.5 degreesC to 2 degreesC | Low (uA-mA) |
| RTD (Pt100) | Resistance (ohms) | Moderate | 0.1 degreesC to 0.5 degreesC | Very Low (uA) |
| Semiconductor IC | Voltage/Digital | Medium | 0.5 degreesC to 2 degreesC | Low (uA) |
NTC thermistors are commonly used in a simple voltage divider setup to produce a temperature-dependent voltage. For example, if you have a 10kOhm thermistor and a 10kOhm resistor across 3.3V:
For a 10kOhm thermistor at 25 degreesC and supply voltage 3.3V:
| Rthermistor | Rfixed | Vin | Vout |
|---|---|---|---|
| 10kOhm | 10kOhm | 3.3V | 1.65V |
As temperature increases, Rthermistor drops, and Vout decreases accordingly. Sensitivity and accuracy of the reading thus rely on resistor selection and circuit noise.
If you experience sensor-induced errors, consider:
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