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Circuitkar Blog

Tutorials, project guides and component deep-dives.

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esp32wifi

ESP32 WiFi Troubleshooting

Every ESP32 WiFi problem diagnosed — cannot connect, keeps dropping, slow connection, static IP, and reconnect logic that actually works.

27 May 2026
1 min read6
electronicsiot

How RFID Attendance Systems Actually Work

PreviousPage 4 of 11Next

Practical insights, comparisons, mistakes to avoid and buying advice for makers and engineers.

26 May 2026
1 min read5
datasheetsensors

How to Read Sensor Datasheets

A practical guide to extracting what you actually need from a sensor datasheet — absolute maximum ratings, electrical specs, timing, and protocol diagrams.

26 May 2026
2 min read3
electronicsiot

Best Sensors for Water Level Monitoring Projects

Practical insights, comparisons, mistakes to avoid and buying advice for makers and engineers.

25 May 2026
1 min read3
arduinobeginner

Beginner Arduino Mistakes

Ten mistakes that every Arduino beginner makes — with the actual explanation of why they happen and how to fix them permanently.

25 May 2026
2 min read4
electronicsiot

Relay Module Buying Guide

Practical insights, comparisons, mistakes to avoid and buying advice for makers and engineers.

24 May 2026
1 min read3
attendance-systemrfid

Attendance System Hardware Guide

All the hardware you need for an RFID-based attendance system — RC522, DS3231, SD card, LCD display, and wiring overview.

24 May 2026
1 min read5
electronicsiot

PIR Motion Sensors Explained

Practical insights, comparisons, mistakes to avoid and buying advice for makers and engineers.

23 May 2026
1 min read4
smart-parkingiot

Smart Parking System Components

Complete component breakdown for a smart parking system — sensors per slot, central controller, display, and software architecture.

23 May 2026
1 min read4