EasyVolts is an adjustable power supply that takes 5V DC from USB and converts it to any desired voltage in the range from 0 to 24V. EasyVolts has embedded microcontroller responsible for output voltage and current limit control over USB. Depending on selected configuration it can be “USB-RS485 converter + 2 GPIO/PWM pins” or “USB-UART converter”. When the device is connected to USB it appears on PC as two virtual COM ports. One is used to control power supply and GPIO, the second – as “USB-UART/RS485” adaptor. Such design lets you control this device easily with any software that can communicate over COM port, including your own programs or scripts.

Technical parameters of the power supply:

• Output voltage: 0-24V.
• Max output current: 1A.
• Max output power: ~2W*(up to ~4W for USB3.0 or high power USB2.0). More details here.
• Voltage resolution: <50mV.
• Current resolution: <2mA.
• Noise: ~200mVpp

Technical parameters of embedded USB-UART/GPIO/PWM converter:

• Logic levels: 3v3.
• UART speed: 300-230400 bit/sec.
• The internal resistance of Rx and Tx pins: ~300 ohm.
• Possible “Tx” pin mode: UART_TX/active low/active high/Z-state(with or without pullUp/pullDown)/PWM(pushPull)*
• Possible “Rx” pin mode: UART_RX/active low/active high/Z-state(with or without pullUp/pullDown)/PWM(pushPull)*
• PWM base frequency: 240kHz.
• PWM frequency division configuration: 1-65535 (PWM frequency 240kHz – 3.66Hz).
• PWM duty cycle resolution: 0.5%.

*- logic level of the pin in activeLow/activeHigh/Z_state can be read by the host, so it provides all possible read/write pushPull/openDrain GPIO functionality.

It was created as a “power+communication” tool for my work. With EasyVolts, I can connect various devices to my laptop and work with them everywhere or even remotely without additional power supply. All that I need for work "in field" with low power electronics is in this device.

EasyVolts is very flexible and features rich. Here are some of his advantages:

• doesn't require special drivers, works on Windows, Linux (and probably Mac, but not tested);
• extremely small yet flexible power supply
• can be controlled over simple textual command in a terminal as well as with GUI interface.
• very easy to integrate with your own software (here you can find examples with Python scripts);
• flexible GPIO, for example, software I2C can be implemented on Python;
• no hardware programming is needed. You can use your PC to control external devices (relays, servos, LEDs) or measure some values (voltage or button state) easily. Example.

You can get more information or demos on my web page.