⚠️ The Problem: Reverse Voltage Can Kill Your Sensor

Connecting power the wrong way—positive to negative—can instantly damage delicate sensors. Whether you’re working on a DIY weather station or an industrial automation project, reverse voltage is a silent killer in electronics.

🔧 The Solution: Add Reverse Voltage Protection

The simplest fix is adding a Schottky diode in series or parallel with the power input. A series diode blocks reverse current, while a parallel diode (in reverse bias) shunts reverse voltage safely to ground—protecting the sensor instantly.

💡 Practical Example: Temperature Sensor Failure

Imagine wiring a DHT11 sensor backward while testing on a breadboard. Without protection, you risk burning it out. By adding a 1N5819 Schottky diode in series with VCC, you prevent current from flowing if polarity is reversed—saving the sensor and your time!

🧮 Sample Calculation: Diode Voltage Drop

Using a 1N5819 Schottky diode:

Typical forward voltage drop ≈ 0.3V

If your supply is 5V, sensor receives ≈ 4.7V

Most sensors (like DHT11 or LM35) work fine above 3.3V, so this drop is safe.

🛍️ Product Suggestion:

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