Bluetooth and NRF24L01 wireless modules for short-range device-to-device communication.

Bluetooth and NRF Modules

Bluetooth modules like the HC-05/HC-06 turn a serial connection wireless for phone pairing or board-to-board links, while NRF24L01 modules use a separate 2.4GHz protocol suited to fast, low-power communication between multiple microcontrollers - both are popular choices when a project needs wireless communication over a room-sized range rather than full WiFi/internet connectivity.

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