走马观花

USB voltage and ammeter

Overview

It has main circuit voltage detection, D+ voltage detection, D- voltage detection, temperature detection detection, two-speed current switch detection (only one speed is used), external EEPOM chip, external expandable low-power Bluetooth module, supports URAT SWD download and debugging , reserved USB communication interface, 4-way micro switch detection, 0.96-inch I2C OLED display and many other peripherals and rich interfaces. However, the software level is limited, and only some basic functions are developed using the Arduino framework.

The power supply uses DC-DC and LDO. The maximum withstand voltage of the chip is 40V. The maximum design voltage is 30V/6.5A. You can modify the component parameters by yourself if you need to expand the current.

The current detection part uses two MOS channels to control two sampling resistors with different resistances to achieve ultra-large range (10uA--6.5A) current detection and overcurrent protection. The microcontroller automatically controls the switching of the current detection circuit, and the current signal is amplified by a precision operational amplifier. The signal is sent to the microcontroller ADC for sampling, calculation and display.

Design Files

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Update:2025-05-07 23:20:36

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