Reverse Voltage Protection in Cameras – Simple & Smart
Ever accidentally reversed the power connection on your camera module and fried it? You’re not alone. Reverse voltage can instantly damage sensitive components, especially in camera modules used in robotics, surveillance, or DIY projects.
❗ The Problem: One Mistake = Dead Camera
Most camera modules (like OV7670 or ESP32-CAM) operate at 3.3V or 5V. If power polarity is reversed—even briefly—the image sensor, voltage regulators, or microcontroller can be permanently damaged.
🛠️ The Solution: Use a P-Channel MOSFET or Schottky Diode
A P-Channel MOSFET configured as a reverse voltage protector is an efficient way to block incorrect current flow. It activates only when the voltage is correctly applied, ensuring zero power loss when connected properly. A Schottky diode is a simpler option but drops some voltage.
🧰 Practical Example: ESP32-CAM in a Home Monitor
A user connects a Li-ion battery backward to an ESP32-CAM board. The camera dies. Adding a P-channel MOSFET between the battery and board prevents damage on the next try—saving cost and frustration.
🔢 Sample Calculation
MOSFET drop: ~0.05V × 0.3A = 0.015W
Diode drop: ~0.4V × 0.3A = 0.12W
Using a MOSFET is 8× more efficient in power-sensitive devices.
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