In IoT projects, especially during prototyping, it’s easy to accidentally reverse power connections. This small mistake can permanently damage microcontrollers, sensors, or Wi-Fi modules.

⚠️ The Problem: Reverse Power Can Destroy Components

Many IoT devices like ESP8266 or NodeMCU boards don’t have built-in reverse voltage protection. If you connect the power supply backward, the current flows the wrong way—burning out your circuit instantly.

🔧 The Solution: Add a Simple Diode or MOSFET

To avoid this disaster:

• Use a Schottky diode in series with the power supply. It blocks reverse current while allowing normal operation.

• Or better: Use a P-Channel MOSFET-based reverse protection circuit, which has lower voltage drop and higher efficiency.

💡 Practical Example: 5V IoT Sensor Node

You’re powering a 5V sensor node with a USB supply. One day, the polarity is reversed during testing. Without protection, the board dies.

✅ Fix: Add a SS14 Schottky diode on the VIN line. It only allows correct current flow, saving your project.

🧮 Sample Calculation: Voltage Drop Across Diode

Forward voltage of SS14 ≈ 0.4V

If your supply is 5V → device gets ≈ 4.6V — still safe for most 3.3V regulators.

🛠️ Product Suggestion (Made in India)

Protect your IoT devices using locally made parts:

• 🔋 Schottky Diodes – For reverse protection
  👉 Shop Schottky Diodes

• 🧪 Flux Paste – For strong, clean soldering
  👉 Shop Flux Paste

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