30A Relay Module 1 Channel
$1.10 – $1.18
Adapter Module for ESP-01 ESP8266
$0.38
UV Light Strip 12V 60 LEDs per Meter 8mm 390nm – 400nm
$1.07 – $1.25
WS2815 12V 5050 Addressable LED Strips 30 60 74 96 144 LEDs
$1.83 – $7.12
WS2812B 5V 5050 Addressable LED Strips 10mm 30 60 144 LEDs
$2.56 – $5.29
12V 5 Meters 5050 LED Strip 60 Pixels per Meter
$0.49 – $1.79

Open Source
Microcontroller Development Boards

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30A Relay Module 1 Channel $1.10 – $1.18
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Adapter Module for ESP-01 ESP8266 $0.38
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5V 12V Bluetooth MP3 Music Audio Decoder Module Board $1.28 – $1.38
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UV Light Strip 12V 60 LEDs per Meter 8mm 390nm - 400nm $1.07 – $1.25
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UV Light Strip 30 60 120 LEDs per Meter 365nm - 370nm $1.92 – $4.75
BK8000L Wireless Bluetooth Stereo Audio Module Transmission AT Commands SPP Bluetooth Speaker Amplifier DIY
$1.48
AC 220V 4000W SCR Voltage Regulator Small Dimming Dimmer Motor Speed Controller Thermostat Module BTA41600B
$1.26
PAM8406 Digital Amplifier Module with Volume Potentiometer 5Wx2 Stereo Class D
$0.37
WeMos D1 Mini V3 NodeMCU with ESP8266-12F WiFi module compatible with Arduino
$1.54