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The Arduino Micro is a microcontroller board based on the ATmega32u4 (datasheet), developed in conjunction with Adafruit. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a micro USB cable to get started. It has a form factor that enables it to be easily placed on a breadboard.
The Micro is similar to the Arduino Leonardo in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Micro to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port. It also has other implications for the behavior of the board; these are detailed on the getting started page.
Schematic & Reference Design
EAGLE files: arduino-micro-reference-design.zip
The Arduino Micro can be powered via the micro USB connection or with an external power supply. The power source is selected automatically.
External (non-USB) power can come either from a DC power supply or battery. Leads from a battery or DC power supply can be connected to the Gnd and Vin pins.
The board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.
The power pins are as follows:
The ATmega32u4 has 32 KB (with 4 KB used for the bootloader). It also has 2.5 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).
Input and Output
Each of the 20 digital i/o pins on the Micro can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions:
There are a couple of other pins on the board:
Pin Mapping of the Arduino Micro displays the complete functioning for all the pins, to use them as in the Leonardo.
See also the mapping between Arduino pins and ATmega32u4 ports.
The Micro has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega32U4 provides UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX). The 32U4 also allows for serial (CDC) communication over USB and appears as a virtual com port to software on the computer. The chip also acts as a full speed USB 2.0 device, using standard USB COM drivers. On Windows, a .inf file is required. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board. The RX and TX LEDs on the board will flash when data is being transmitted via the USB connection to the computer (but not for serial communication on pins 0 and 1).
A SoftwareSerial library allows for serial communication on others Micro's digital pins.
The ATmega32U4 also supports I2C (TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus; see the documentation for details. For SPI communication, use the SPI library.
The Micro appears as a generic keyboard and mouse, and can be programmed to control these input devices using the Keyboard and Mouse classes.
The Micro can be programmed with the Arduino software (download). Select "Arduino Micro from the Tools > Board menu. For details, see the reference and tutorials.
The ATmega32U4 on the Arduino Micro comes pre-burned with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the AVR109 protocol.
You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header using Arduino ISP or similar; see these instructions for details.
Automatic (Software) Reset and Bootloader Initiation
Rather than requiring a physical press of the reset button before an upload, the Micro is designed in a way that allows it to be reset by software running on a connected computer. The reset is triggered when the Micro's virtual (CDC) serial / COM port is opened at 1200 baud and then closed. When this happens, the processor will reset, breaking the USB connection to the computer (meaning that the virtual serial / COM port will disappear). After the processor resets, the bootloader starts, remaining active for about 8 seconds. The bootloader can also be initiated by pressing the reset button on the Micro. Note that when the board first powers up, it will jump straight to the user sketch, if present, rather than initiating the bootloader.
Because of the way the Micro handles reset it's best to let the Arduino software try to initiate the reset before uploading, especially if you are in the habit of pressing the reset button before uploading on other boards. If the software can't reset the board you can always start the bootloader by pressing the reset button on the board.
USB Overcurrent Protection
The Micro has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.
The maximum length and width of the Micro PCB are 4.8cm and 1.77cm respectively, with the USB connector extending beyond the former dimension. The layout allows for easy placement on a solderless breadboard..
|Ship-From Address||Kuala Lumpur, Wilayah Persekutuan Kuala Lumpur|
|Return/Exchange Address||Kuala Lumpur, Wilayah Persekutuan Kuala Lumpur|
|Notice on Return/Exchange||All items purchased online through Autobotic Solution are returnable. If for any reason you would like to return the Goods for an exchange or refund please email us at firstname.lastname@example.org. We will use all reasonable efforts to respond to you within 24 business hours. Can I make a return to you? 1.1 Please notify us within 7 days of receiving your order if you would like to return an item. The item must be returned to use in the condition as supplied to you so please repack it with care using all of the original packaging or a suitable alternative. As the Goods are your responsibility until they reach us please ensure you package your return to prevent any damage to the items or boxes. This does not affect your statutory rights. 1.2 You will be given the option to have the item replaced (if available) or to be refunded through the payment method used by you when purchasing the Goods. Replacements will be issued upon our receipt of the returned Goods. Items must be returned in their original condition with all packaging and documentation. You are responsible for the return package and all associated posting costs unless you received such items damaged. The items need to be received back to us within 28 days of receipt of the package by you. We do advise that you obtain a certificate of posting from the Royal Mail in case the parcel (for whatever reason) fails to reach us. 1.3 We will use all reasonable efforts to issue a refund within 10 working days but, in any event, no later than 30 calendar days after receipt of the returned Goods. We regret that additional costs such as shipping cost and gift-wrapping cannot be refunded. 1.4 Please note that refunds on items bought as gifts can only be issued to the original purchaser. If you decide to exchange an item then unfortunately we cannot stop the original purchaser from knowing. Can I cancel my order? 2.1 You can cancel your order at any time prior to your order being processed. Please be aware that orders are usually processed on the same day they are received. Please email email@example.com with your address and order reference number. 2.2. You also can withdraw from the order at any time after it has been dispatched but you must notify us within 7 working days of receipt of the items. Please email firstname.lastname@example.org with your address and order reference number. 2.3 Items must be returned in their original condition with all packaging and documentation. The items need to be received back to us within 28 days of receipt of the package by you. We do advise that you obtain a posting with tracking number in case (for whatever reason) the parcel fails to reach us. 2.4 We will use all reasonable efforts to issue a refund within 10 working days but, in any event, no later than 30 calendar days after receipt of the returned Goods. Please note that you are responsible for the return package and for all postage costs and we regret that additional costs such as express delivery and gift-wrapping cannot be refunded. We reserve the right to refuse to issue a refund or replacement and to recover the cost of returning or collecting the Goods in the event that the Goods are found to have suffered damage after delivery or have been misused or used other than in accordance with the instructions or if the problem is due to normal wear and tear or if the Goods have not been returned with its original packaging. This does not affect your statutory rights.|
Return / Exchange Policy
- Request for cancellation if product has not been dispatched after payment completion.
- Request for return within 7 calendar days following delivery date.
- Check seller’s approval on buyer’s request.
- Buyer sends product in question to seller.
- Seller receives and checks returned product
- Seller approves return and return is completed.
- Request for exchange within 7 calendar days following receipt of delivery.
- Check seller’s approval on buyer’s request.
- Buyer sends product in question to seller.
- Seller receives and checks returned product
- Seller send new product to buyer, and buyer receives it, and exchange is completed.
How to Request for Cancellation/Return/Exchange
You can request for cancellation after completing payment and if product has not been dispatched by then, cancellation request is approved and you can receive refund.
But, in case seller has already dispatched product, cancellation request can be rejected.
You can request for return after obtaining product, you should send the product in question to seller.
After seller checks if returned product is flawed, and approves your request, return is completed and payment is refunded.
You can request for exchange if wrong product is shipped, you should send the product in question to seller.
After seller checks if returned product is flawed, seller approves your request, and re-sends new product.
- You can request for cancellation after completing payment and if product has not been dispatched by then, cancellation request is approved and you can receive refund.
Criteria for Return/Exchange
You can request for return/exchange within 7 calendar days following delivery date. But return/exchange request cannot be made in following cases:
- When request due to change of mind is made after 7 calendar days following delivery date
- When product is used, destroyed or damaged
- When tag attached to product is removed or package of product is opened and product value is damaged
- When sealed package is opened or packaging materials are lost
- When too much time has passed and product value has so decreased that its re-sale is not possible
- When return/exchange request is made for customized product such as hand-made shoes or accessories
- When components of product (including free gift) have been used or lost
- When buyer did not follow instructions included in product
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