Voice control steering gear switch light

1. Overview of
voice control servo control switch, simulating human hands to control lights.
This project uses TYPE-C-USB power supply and battery power supply. Most of the packages are 0402, in order to reduce the size of the board and facilitate fixation.
Note, tppe- c burning may not be successful, it is recommended to lead out the serial port pins and use a serial port downloader to download
1. For the VC core circuit,
you only need to lead out the mic and speaker, as well as the sig (io27) servo signal line.
1. VCC and GND ——>5V Power supply access
2, MIC- and MIC+ ——>MIC input
3, SPK- and SPK+ ——>Speaker output
4, TX1 and RX1 ——>Serial port output and firmware burning
5, IOA27 ——>Servo control 2, 3.
In the reset circuit below the reset circuit, just refer to the design in the red box. Because the VC module does not have a reset pin, the only way to achieve reset is to power on and off. Therefore, it is necessary to use a MOS tube for control. The model of the MOS (field effect) tube used in this circuit is AO3401, which is a PMOS (P-channel field effect tube). The driving of the MOS tube is to turn on the low level and cut off the high level. Therefore, the function of R7 is to make the MOS conductive by default and provide power to the VC module; when the SW1 button is pressed, the MOS tube is turned off and the VC module is powered off; in this way, a power-off reset can be achieved.

 
4. Serial port circuit The serial port circuit is a USB to TTLL circuit. The chip signal used is: CH340C, which is powered by 5V, so a 1uF capacitor needs to be connected to pin 4 to be recognized by the computer. It usually requires a USB interface to connect to the computer. This project uses a Type-C female socket. There are no special requirements for wiring, just walk through them. 5. Charging circuit and boost circuit