When building projects with sensors, one common mistake is accidentally reversing the power supply. This simple error can instantly damage delicate ICs or analog sensors. Thankfully, reverse voltage protection is easy to implement—and crucial for all hobbyists and engineers working with Made in India components.

🔧 The Problem: Reversed Power = Fried Sensor

Many popular sensors like the DHT11, MQ series, or analog IR sensors have no inbuilt reverse polarity protection. If Vcc and GND are mistakenly swapped during wiring, the sensor can permanently fail.

✅ The Solution : Use a Diode or P-Channel MOSFET

A Schottky diode in series with the Vcc line is the simplest way to block reverse current. For higher efficiency, especially in low-voltage applications, a P-channel MOSFET configured as a reverse protection switch offers minimal voltage drop and better performance.

🔍 Real-World Example: Soil Moisture Sensor

Suppose you connect a soil sensor to your 5V line, but accidentally swap the Vcc and GND. Without protection, the sensor overheats and stops working. Adding a Schottky diode in the Vcc line prevents damage—keeping your automation project safe.

🧮 Sample Calculation: Voltage Drop Across Diode

Sensor needs 5V, diode forward drop = 0.3V
Effective Vcc = 5V – 0.3V = 4.7V → still acceptable for most 5V sensors

🛒 Product Suggestion: Made in India Components

• 🔌 [Shop Schottky diodes]

• ⚙️ [Shop P-channel MOSFETs]

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