How to program Arduino Nano / Pro-Mini / Pro-Micro clone that has no usb port? - Electrical Engineering Stack Exchange
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I was looking for a cheapest possible option to get arduino and wireless comms for a dimmable light and come across this
when searching for Arduino Nano clone. It has no usb port so how can it be programmed?
I have discovered that there is a new device called "Arduino Pro Micro" which is similar to Pro Mini and Nano but have usb port in-built. The best thing is you can
for under 4 euros! Excellent for a dimmable LED light...
It's similar to an arduino but with the USB to UART converter chip removed to be cheaper. In order to program it you have to use an external converter and connect it to the Rx/Tx pins.
Please note that these boards don't use a crystal as a clock source but a 16MHz resonator which has higher tolerance (0.5%)
You'll need to get an external USB to serial board (or cable), like
Note that there are two "versions" of USB to serial boards. One version outputs Tx pin to Tx header and Rx pin to Rx header and the other version outputs Tx pin to Rx header and Rx pin to Tx header.
If your board outputs Tx pin to Rx header and Rx pin to Tx header (the signals are already crossed) then you should connect Rx of the USB board to Rx of Arduino, and Tx of the USB board to Tx of Arduino (like shown below)
If your board outputs Tx pin to Tx header and Rx pin to Rx header then you should connect Rx of the USB board to Tx of Arduino, and Tx of the USB board to Tx of Arduino (cross connect like shown below)
9,46211548
Nano vs Pro-Mini
What you have looks more like a Pro-mini than a Nano
Note the MOSI, MISO and SCK annotations in pale blue on pins 11,12,13.
As well as using the serial-port (via an off-board USB to serial adapter) to program the Arduino-Nano, you can also program the on-board Atmega168/ATmega328 using ICSP. You need a programmer but you can use another Arduino for this (using the Arduino as ISP sketch), a bus-pirate or other devices.
Arduino pins 11,12 & 13 are MOSI, MISO and SCK. You also connect reset ("RST"), VCC and GND.
Typical AVR ICSP connector
The Arduino IDE can be, relatively easily, made to recognise "Arduino as ISP" and "buspirate" as options for the "programmer" menu. The IDE uses avrdude to upload sketches, current versions of avrdude (as included in the current IDE) know all about the bus-pirate and several other devices that can be used as programmers.
12.4k42757
The Pro Mini comes in two flavors: 3.3V (running at 8MHz) and 5V (running at 16MHz)
As far as I know there are no obvious markings to distinguish the two.
alexan_e 's answer above works for the 5V model. If you buy the 3.3V model (which is nice for interfacing other low voltage chips) then the wiring needs some adjustments. The USB interface boards provide a 5V out pin, and the Pro Mini has a RAW input pin. Those two need to be connected and you then get regulated 3.3V out on the Pro Mini's VCC pin.
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续费一年阅读会员，立省24元！
同一个外部中断的Arduino随机睡眠与唤醒_刘贤锴
&&为了控制Arduino的随机睡眠与唤醒,不采用“预定睡眠-随机唤醒”的常规设计模式,而是通过一个外部中断随机使Arduino进入睡眠,并且通过同一个外部中断随机唤醒Arduino。首先使用开源Enerlib和LowPower库对Arduino Pro Mini进行实验,然后应用于实际的工程设计中,取得了很好的效果。该方法可以作为成熟的方案推广到工程设计的实际应用当中。
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小白问问题：：arduino pro micro的问题收藏
我在学习arduino 刚好看到有鼠标例程的程序，然后就手贱下进去arduino micro里面去了。现在问题来了。这货变成一个鼠标了。鼠标没有了COM口，我想重新刷程序没办法了。有没有复位按钮。怎么破啊啊。
「天猫男人节」arduino扩展板,前1小时折上5折!更有千元大额券,2件75折超值优惠!千万别怀疑,男士盛典,就在天猫!
每次上电的时候，首先跑得就是 Bootloader啊另外，对于这个串口会一直在（teensy 会没有的）实在不行你就琢磨自己用 usbisp 再下载一个吧
另外，这个是有 rst pin 的你可以试试拉低，然后马上下载
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Arduino Micro
Arduino Micro is the smallest board of the family, easy to integrate it in everyday objects to make them interactive.The Micro is based on the ATmega32U4 microcontroller featuring a built-in USB which makes the Micro recognisable as a mouse or keyboard.
Documentation
The Micro is a microcontroller board based on the ATmega32U4 (), developed in conjunction with&. 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 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 board 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 b these are detailed on the&.
You can find&&your board warranty informations.
Getting Started
You can find in the&&all the information you need to configure your board, use the Arduino Software (IDE), and start tinker with coding and electronics.
Need Help?
On the Software&
On Projects&
On the Product itself through&
OSH: Schematics, Reference Design, Board size
Arduino / Genuino Micro is open-source hardware! You can build your own board using the follwing files:
Programming
The Micro board can be programmed with the&. Select "Arduino/Genuino Micro from the Tools & Board menu. For details, see the&&and&.
The ATmega32U4 on the Micro comes preprogrammed 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&& see these&.
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 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 become 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:&
VI. The input voltage to the MICRO board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin.
5V. The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an on-board regulator, or be supplied by USB or another regulated 5V supply.
3V. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.
GND. Ground pins.
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&).
Input and Output
See the mapping between Arduino pins and ATmega 32U4 ports, and the Pin Mapping of the Arduino Micro:
Each of the 20 digital i/o pins on the Micro can be used as an input or output, using&,, and&&functions. They operate at 5 volts. Each pin can provide or receive 20 mA as recommended operating condition and has an internal pull-up resistor (disconnected by default) of 20-50 k ohm. A maximum of 40mA is the value that must not be exceeded to avoid permanent damage to the microcontroller.
In addition, some pins have specialized functions:&
Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data using the ATmega32U4 hardware serial capability. Note that on the Micro, the Serial class refers to USB (CDC) for TTL serial on pins 0 and 1, use the Serial1 class.
TWI: 2 (SDA) and 3 (SCL). Support TWI communication using the&.
External Interrupts: 0(RX), 1(TX), 2, 3 and 7. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the&&function for details.
PWM: 3, 5, 6, 9, 10, 11 and 13. Provide 8-bit PWM output with the&&function.
SPI: on the ICSP header. These pins support SPI communication using the&. Note that the SPI pins are not connected to any of the digital I/O pins as they are on the Uno, they are only available on the ICSP connector and on the nearby pins labelled MISO, MOSI and SCK.
RX_LED/SS This is an additional pin compared to the Leonardo. It is connected to the RX_LED that indicates the activity of transmission during USB communication, but is can also used as slave select pin (SS) in SPI communication.
LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.
Analog Inputs: A0-A5, A6 - A11 (on digital pins 4, 6, 8, 9, 10, and 12). The Micro has a total of 12 analog inputs, pins from A0 to A5 are labelled directly on the pins and the other ones that you can access in code using the constants from A6 trough A11 are shared respectively on digital pins 4, 6, 8, 9, 10, and 12. All of which can also be used as digital I/O. Each analog input provide 10 bits of resolution (i.e. 1024 different values). By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the&&function.
There are a couple of other pins on the board:&
AREF. Reference voltage for the analog inputs. Used with&.
Reset. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.
Communication
The Micro has a number of facilities for communicating with a computer, another board of the Arduino & Genuino family, or other microcontrollers. The 32U4 provides UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX). The ATmega32U4 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.&&. The Arduino Software (IDE) includes a serial monitor which allows simple textual data to be sent to and from the 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&&allows for serial communication on other Micro's digital pins.
The ATmega32U4 also supports I2C (TWI) and SPI communication. The Arduino Software (IDE) includes a Wire library to simplify use of the I2C see the&&for details. For SPI communication, use the&.
The Micro appears as a generic&, and can be programmed to control these input devices using the Keyboard and Mouse classes.
Physical Characteristics
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..
Automatic (Software) Reset and Bootloader Initiation
Rather than requiring a physical press of the reset button before an upload, the Micro board 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 (IDE) 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.
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