This is a basic text-based 16 characters by 2 lines LCD with white character on blue backlight. It utilizes the extremely common HD44780 parallel interface chipset.
keyestudio USB Host v1.5 shield is an add-on board for Arduino USB Host. Directly plug it onto an Arduino board and it will allow the Arduino to have a USB Host function. The Arduino with host function can communicate with a USB device, such as USB flash disk, keyboards, mouse/mice, joysticks, digital camera, etc
This is the popular Bluetooth module, HC06, which is slave mode only. It’s very easy to add wireless serial connectivity for your device with this module. Examples for Arduino and other boards are available. Once you pair with other Bluetooth device you work like with normal UART to exchange data.
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