1. Solution name:
Wireless digital intercom based on GD32F350
2. Solution Introduction
This solution is based on the GD32F350 Cortex-M4 core MCU as the main control, and the MIC part uses the MAX-9814 module, which is a low-cost, high-performance microphone amplifier with automatic gain control (AGC) and low-noise microphone bias chip. The RF part uses the NRF24L01 2.4G wireless transmission module, which is a single-chip wireless transceiver chip that works in the 2.4~2.5GHz world-wide ISM band. It has extremely low current consumption: when working in the transmission mode, the current consumption is 11.3mA when the transmission power is 0dBm, and 12.3mA in the receiving mode. The current consumption is even lower in the power-down mode and standby mode. The working 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 lightness, with a resolution of 128*64 and multiple interface modes. The module provides a total of 5 interfaces including: 6800 and 8080 parallel interface modes, 3-wire or 4-wire SPI interface, and IIC interface mode.
The RF 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 non-junction digital intercom solution.
3. Scheme structure diagram
[attach] 380749 [/attach] [attach] 380750 [/attach]
4. Software flow
[attach] 380787 [/attach]
The software starts to receive data after initialization, and sets NRF24L01 to receive mode. If there is data at this time, it will decode, analyze the frequency spectrum, and then play and display the frequency spectrum. If the send button is pressed at this time, it will enter the sending state, set NRF24L01 to the sending mode, turn on the timer to sample 8K audio data, perform frequency analysis and encoding on the sampled data, and then send it through NRF24L01 and display the frequency on the OLED. Release the button to receive data. If the setting button is pressed at this time, the communication channel is set directly. After the setting is completed, press the setting button again to return to the receiving state.
5. Experimental pictures and videos
https://v.youku.com/v_show/id_XM ... 42.soresults.dtitle
https://v.youku.com/v_show/id_XM ... 42.soresults.dtitle
6. Schematic diagram and source code
Since you are participating in the competition, you must release the source code. If you don’t release the source code, you will be playing tricks.
GD32F350_Speeker.7z
(4.23 KB, downloads: 124)
GD32_Interphone.7z
(76.76 KB, downloads: 270)
提升卡
变色卡
千斤顶
From 2
京公网安备 11010802033920号
