Wireless digital intercom based on GDF350

This solution is based on the GD32F350 Cortex-M4 core MCU as the main control, and the MIC part uses the MAX-9814 module. It is a low-cost, high-performance microphone amplifier with automatic gain control (AGC) and low-noise microphone bias chip. The radio frequency part uses the 2.4G wireless transmission module of NRF24L01, which is a single-chip wireless transceiver chip working in the 2.4~2.5GHz world-wide ISM frequency band. It has extremely low current consumption: when working in transmit mode, the transmit power is 0dBm. The current consumption is 11.3mA, 12.3mA in receiving mode, and the current consumption is even lower in power-down mode and standby mode. The operating rate is up to 2Mbps, which is more than enough to cope with 64kbps G711 encoding and 16kbps ADPCM encoding. The display part uses a 0.96-inch OLED module as the display interface. It has the advantages of ultra-fast response speed and thinness, with a resolution of 128*64 and a variety of interface methods. The module provides a total of 5 interfaces including: 6800 , 8080 two parallel interface modes, 3-wire or 4-wire SPI interface, and IIC interface mode.

The radio frequency part of this wireless CNC intercom solution uses the 2.4G frequency band, supports 64 communication channels, and supports broadcasting. In short, this solution is a low-cost and high-efficiency knotless digital intercom solution.