HC-11 CC1101 433MHz Wireless Transceiver RF Serial UART Module Quadcopter DIY Drone Combo Kit for Beginner whereas the RB variant provides

whereas the RB variant provides more Flash for complex applications and additional GPIO pins for expanded peripheral connections

Built-in Self-Test: Internal self-test feature enables you to verify sensor functionality during initialization

then reconnect the motor

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The 240MHz dual-core processor and 520KB SRAM are sufficient for basic face detection and recognition with pre-trained models

HC-11 CC1101 433MHz Wireless Transceiver RF Serial UART Module Quadcopter DIY Drone Combo Kit for Beginner whereas the RB variant providesHC 11 CC1101 433MHz Wireless Transceiver RF Serial UART Module