1. Since the internal ADC resolution of the digital microphone is fixed, software amplification will cause small signal distortion 2. The output of ES8311 is not only connected to the audio PA, but also connected to the third channel of the audio ADC ES7210 for echo cancellation. [img][/ESP32-S3-BOX...

1. Digital microphones can save an ADC chip, but their gain is generally not adjustable. 2. Dual microphones are used for speech recognition, an additional ADC channel is used to capture the output of the DAC (speaker) for echo cancellation (although it is currently not turned on for some reason). t...

Hi,
1.默认开机上电不显示可能是运输损坏了，可以联系退换货
2.在 Menuconfig 的 Serial Flash Config 中配置 monitor 的波特率，HMI 的 例程默认是 2M 的波特率

当时在设计时没有加用于固定的机构，因此为了避免松动用胶水粘住了。
开发板有不带电池的版本，您可以联系商务或者客服获取该版本，使用的电池为 iPhone 5S 的电池，可以在淘宝上购买到，价格也非常便宜，一般 30 左右甚至更低就能买到

Hi,该连接器为非自锁型，在强烈震动下有概率脱落。一般会在上方盖上金属盖板并用螺栓拧紧。由于盖板并不是标准件，因此使用胶水固定以避免脱落。