A-Star 32U4 Mini SV Developer Board
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.
Pin Mapping : 