// FREE MINI-COURSE · °C
Sensors
Sensors from Zero — How electronics feel heat, light, distance and motion, and how an Arduino reads them.
2 of 4 lessons out · next: LDR: the resistor that sees light
▶ Start lesson 1- 01
NTC thermistor: the resistor that feels heatKnow why an NTC's resistance drops when hot and how a 10 kΩ divider lets an Arduino read it.
EP.31 · 20 s - 02
LM35: the chip that speaks °COUT = 10 mV per °C (25 °C = 250 mV); on A0: tempC = raw × 500 ÷ 1024.
EP.67 · 24 s - 03 COMING NEXTLDR: the resistor that sees lightBuild an automatic night light with an LDR divider.
- 04 PLANNEDUltrasonic HC-SR04: measuring distance with soundMeasure distance from an echo's travel time.
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