Countdown voice flashbang

         Why be silly and have fun with others instead of just fooling yourself!
Project origin: In response to JLC Electronics' "Foolish" Design Call for Submissions (basically, to get JLC ​​for free), and to verify the voice module's functionality.
Functions:
1. Press the power button in standby mode to power on (FLASH and voice module power supply not included) .
2. Short press: Add 10 seconds to the countdown.
3. Double press: Add 100 seconds to the countdown.
4. Long press: Start the countdown.
Overall design scheme block diagram, flowchart ,
schematic diagram, design description,
PCB design description:
Nothing much to note, follow the EDA and PCB free prototyping rules.
Software description:
The countdown is divided into three segments: when the countdown is greater than 2/3, the WS2812 displays a green light (indicating that the countdown time is still long); when it is greater than 1/3, a yellow light is displayed; when it is less than 1/3, a red light is displayed. When the countdown ends, two atomic explosion sounds are emitted, along with the sound of receiving Alipay payment. When the digital tube displays BBBB, you need to say the voice prompt three times to exit the voice, turn off the power, or continue to loop the above voice. Code block:
This is a simple
demonstration of serial port reception and transmission.
Important notes:
HLK-V20 voice communication requires flashing firmware from another manufacturer (HLK needs to step up its game; keeping it closed is not an option)). Otherwise, bidirectional serial communication is not possible.