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ESP01 ESP 01 ESP8266 WiFi Module - a black rectangular circuit board with an integrated antenna, a central chip, and eight downward-facing connector pins.

ESP01 ESP 01 ESP8266 WiFi Module

PKR 300
HC-SR501 PIR Motion Sensor Module Hw-416-b - a white dome lens, a green circuit board, two orange potentiometers, and two black capacitors.

HC-SR501 PIR Motion Sensor Module Hw-416-b

PKR 210
TP4056 1A Li-ion Battery Charging Board Micro USB With Current Protection BMS - a blue rectangular circuit board featuring a micro USB port, surface-mount components, and labeled terminals.

TP4056 1A Li-ion Battery Charging Board Micro USB With Current Protection BMS

PKR 50
HW-411A LM2596 DC To DC Buck Converter Step Down Module Power Supply - a blue circuit board featuring a silver capacitor, a black inductor, and a small brass adjustment screw.

HW-411A LM2596 DC To DC Buck Converter Step Down Module Power Supply

PKR 150
Hc 05 Bluetooth Module - a blue circuit board with a gold-patterned antenna, a central black chip, and a six-pin connector header.

Hc 05 Bluetooth Module

PKR 760
Arduino Nano V3 - shown with a blue circuit board, a USB port, a reset button, and two separate rows of header pins.

Arduino Nano V3

PKR 660
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