Bluetooth controller

This controller uses an STM32F103C8T6 chip and Bluetooth communication.
The
charging module uses a TP4056 chip for battery management, offering the following advantages:
• Programmable charging current up to 1000mA •
No MOSFET, sense resistor, or isolation diode required
• Complete linear charger for single-cell lithium-ion batteries in an SOP package
• Constant current/constant voltage operation with thermal regulation to maximize charging rate without overheating
• 4.2V preset charging voltage accuracy up to ±1.5%
• Charging current monitor output for battery level detection
• Automatic recharging
• Dual outputs for charging status, with no battery and fault status indicators
• C/10 charging termination
• 55uA supply current in standby mode
• 2.9V trickle charging device version
• Soft-start limits inrush current
• Battery temperature monitoring function
• 8-pin SOP-PP package.
 
The charging current can be adjusted by changing the resistor R13 in the above schematic diagram.
II.
The joystick uses an ADC for data acquisition:
the joystick is a bidirectional cross 10K resistor. The module uses 5V power supply. In its original state, the X and Y read voltages are approximately 2.5V. When the joystick is pushed in a certain direction, the corresponding axis voltage value increases or decreases, with a maximum value of 5V and a minimum value of 0V.
1. Operating voltage: 5V
2. Output voltage range: 0~5V
3. Interface: Two analog signals represent X and Y offsets, and one digital signal SW represents whether the Z-axis is pressed.
III.
Buttons are controlled by detecting high and low levels using ordinary I/O ports.
IV.
The OLED uses a four-interface I/O protocol to write and display the required data,
enabling wireless control of the car.
It is suitable for beginners and is simple and easy to use.