Wireless digital full-duplex intercom solution (circuit + source code)

Overview

Open source a SPEEX full-duplex digital walkie-talkie. Full-duplex communication is achieved with NRF24L01, just like making a phone call. Currently, it is only point-to-point. The longest straight-line distance test is 300M. The module with PA added on the Internet is used. The circuit uses STM32F103R as the main control chip. Note: 8k sampling is 1S/1KB of data, that is, 1MS per B, and the compression rate is really high. The sound quality is similar to making a phone call, and the noise is very small. In fact, the amount of data to be transmitted is very small, 1S/KB of data. The reason for choosing 2.4G here is that the response packet is used to carry data to transmit and receive data, otherwise the switching of the transceiver mode will be very slow and cannot meet the full-duplex requirements.

Design Files

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Update:2025-06-19 18:27:48

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