Electronic pointer (with mouse control)

• 1. The electronic pointer can not only control the up and down pages of ppt, but also simply control mouse movement and left and right clicks. It will automatically enter low power consumption mode if it is not used for more than 30 minutes after being turned on.

• 2. Use 1000ma large-capacity rechargeable lithium battery, and have a 500ma self-restoring fuse at the battery and chip power supply switch.

• 3. Each button on the sending end has a resistor and a capacitor to form hardware debounce, and the main control chip uses STC15W408AS.

• 4. The charging interface adopts a 6p-typec interface that can pass large current and supports forward and reverse plugging.

• 5. Adopt tc6056a charging circuit. When the lithium battery is charging, the RED light under the electronic pointer lights up, and the blue light lights up when it is fully charged.

• 6. Using TC6291 lithium battery boost circuit and 3.3v buck circuit, using tantalum capacitors, the performance is reliable and the size is small.

• 7. The communication module between the sender and the receiver uses lc12s, which costs 4.6 yuan each. The transmission line-of-sight is 120m, and it can be used for transmission in the classroom.

• 8. The receiving end uses the ch9329 chip, which can simulate a full keyboard and mouse, and can be used without a driver. When plugged into the computer, it will be recognized as a HID device, plug and play.

• • -

• Front view

• Rear view

• The final diagram is as shown above. The big one is the sending end of the electronic pointer, and the small one is the receiving end of the electronic pointer.

• The buttons on the sending end are, from top to bottom, the laser indicator button, ppt previous page, ppt next page, and the left side of the lower two buttons are the left mouse button and the right mouse button. The next four buttons are for relative up, down, left and right movements of the mouse. (The default movement is 5 pixels each time) I am about to graduate. I have stayed in the Mechanical and Electrical Science and Technology Innovation Association of our school for more than three years, so I made one for each of the three instructors in our association (limited by time, I made A bit big) I soldered all afternoon, and the solder smoke made me dizzy.

Below is the back view of the blank board after proofing:

In the attachment below, I will provide three-dimensional drawings, keil engineering source files, and reference materials for the main chips.