WiFi
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Arduino UNO ESP8266 WiFi Shield
$10.80UNO R3 ESP8266 serial WiFi expansion board shield ESP-12E CC3000
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ESP8266 Serial WiFi Wireless Transceiver Module
$10.80ESP8266 Serial Wifi Wireless Transceiver Module is a low-cost, integrated Wi-Fi transceiver module designed for microcontroller projects. It operates on a single-chip SoC (System on Chip) and can be used to add Wi-Fi connectivity to microcontroller projects. The module can be connected to a microcontroller via serial communication, and it supports both station and soft access point modes, allowing it to connect to Wi-Fi networks or create its own network. The module can be programmed using the Arduino platform and has a small form factor, making it suitable for compact projects and wearable devices.
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NodeMCU v3 WiFi Board
$20.52NodeMCU V3 is an open-source firmware and development kit that helps you to prototype your IOT product within a few Lua script lines. The Development Kit based on ESP8266, integates GPIO, PWM, IIC, 1-Wire and ADC all in one board. Power your developement in the fastest way combining it with NodeMcu Firmware!
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WeMos D1 R1 WiFi ESP8266 Board
$16.20WeMos-D1R1 IoT development board is an ESP8266-12 based WiFi enabled microprocessor unit on a Arduino-UNO footprint. That means the board looks and works (in most cases) like an UNO. Apparently several shields, sensors and output devices that are manufactured for the Arduino platform will work on the WeMos-D1R1 with the added advantage of builtin WiFi.