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A-Star 32u4 Mini SV is a very small, programmable, useful and multi purpose developer board holding Atmega32u4 microcontroller on it. It is fully compatible with Arduino. The biggest difference between similar products is to have an on-board step-down regulator, the board is able to operate between 5 - 36 V with this regulator. Sizes of this little board are 4.8 cm x 1.8 cm. There are totally 26 I/O pins on the board (7 of them as PWM, 12 of them as Analog input).
Atmega32u4 supports usb port internally, so it is possible to connect the board directly to the computer and by the pre-loaded you may use Arduino IDE easily. Pololu company - made these A-Star boards based on Atmege32u4 microcontroller.
Atmega32u4 supports internal 32 kB flash memory, 2.5 kB SRAM and inter lan usb interface. There is a micro usb connector on the board for computer connection but the kit does not include usb cable. Moreover, there are ISP pins, LEDs and a crystal oscillator on the board. The board is supplied bu usb connector or an external 5 - 36 V voltage source thanks to the step - down regulator.
All A-Star Mibi series boards have a 5V high efficiency switched regulator on-board. Different versions support diffrent input voltages
- A-Star 32u4 Mini ULV: 0.5 - 5.5 V input voltage
- A-Star 32u4 Mini LV: 2.7 - 11.8 V input voltage
- A-Star 32u4 Mini SV: 5 - 36 V input voltage
The boards provide reverse voltage and overcurrent protection.
There are 26 I/O pins on A-Star 32u4 Micro (7 of them are PWM out, 12 of them are Analog in). The board is compatible with breadboard.
User Guide contains detailed information about A-Star Mini SV and the other A-Star boards.
Note: The kit does not include Micro Usb cable.
Details of A-Star32u4 Mini:
Mini SV version is able to work with 5 - 36 V input voltage. There is ISL85415 5V 500 mA step - down regulator on-board.
You may see efficiency graphics og A-Star boards below.
The regulator on the Mini SV board can provide contunious 500 mA output current. The regulator has high temperature protection. You may see the current - voltage drop relationship in the graphics below. This current - voltage drop graph is lineer. It is possible to supply the regulator with 5 V as low voltage drops on low charges. But you should consider voltage drop while charge is increasing. It is suggested to use 6 V power suplly for high charges.
Note: Batteries hold more than their ideal voltage when they are full charged. So, the Mini SV board can be used with 24 V battery but not 36 V battery.
A-Star 32u4 holds the same microcontroller as Arudino Leonardo and Arduino Micro but provides smaller size and more functions.