LM35: the chip that speaks °C

Can your Arduino feel the temperature? Meet the LM35 🌡️

1️⃣ 10 mV PER °C: three legs — +5V, OUT, GND (flat face toward you). The OUT leg gives 10 millivolts for every degree Celsius.

2️⃣ REAL NUMBERS: 25 °C → 250 mV. Hot tea at 60 °C → 600 mV. 100 °C → 1 V. You can check it with a multimeter.

3️⃣ ARDUINO CODE: connect OUT to A0, then:
int raw = analogRead(A0);
float tempC = raw * 500.0 / 1024;
Serial.println(tempC);
(5 V ÷ 1024 steps = 4.88 mV per step, and 10 mV = 1 °C → × 500 ÷ 1024.)

📌 10 mV per °C — that's the LM35.