Offline voice night light

Original link: https://oshwhub.com/course-examples/zhi-neng-jia-ju-zhi-nengai-yu-yin-xiao-ye-deng
      Schematic diagram:
       using typeC5V DC input for the module and four-way RGB The lantern is powered by the AMS11175 voltage regulator chip that converts to 3.3V stable DC output. 22uf and 10uf chip capacitors are added to both ends for filtering to ensure the stability of the medium input power supply. When choosing a model, it is recommended to choose a horizontal interface. Because the wrong model was selected, I did not pay attention to welding it when I bought it and later found that the interface was standing upright, which was inconvenient for power input.
      The module uses Qiyingtailun C1122 as the main control. The module has its own LDO output of 3.3V. One end of the resistor R3 is connected to the ninth pin, and one end is connected to the 3.3V pull-up generated by itself to enter the download mode. RXD and TXD are serial port downloads. , the four RBGs are driven by NPN type transistors. When the module outputs a high level, the transistors are turned on. By controlling the duty cycle and time of the PWM, the effect of colored lights can be modulated. The output speaker is 4W3Ω, which can be purchased on Taobao. Plus four copper post holes for easy fixing.
     PCB:
     The layout places the four RBGs at the four corners, the microphone in the center, and the speaker interface on the right.
     Power supply part: In order to ensure the circulation of the power supply and the return of the ground, the power line should be more than 20 mils, and the GND should be connected with copper. The placement of vias will help the heat dissipation of the power supply and the return of the ground. Pay attention to the bottom of the module when laying copper. Do not lay copper to prevent signal interference. Logos and pictures added by yourself.
     For the code and software debugging part, please refer to the original link. Upload the above to the attachment.