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For Arduino Nano V3.0, Elegoo Nano board CH340/ATmega328P, compatible with Arduino Nano V3.0 (pack of 3) …
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- The Nano is 100% compatible with Arduino, using the same chips ATmega328P and CH340 with the official version.
- It is a smallest, complete, and breadboard friendly board. It has everything that Arduino/Genuino UNO has (electrically) with more analog input pins and onboard +5V AREF jumper.
- Nano's got the breadboard-ability of the Boarduino and the Mini+USB with smaller footprint than either, so users have more breadboard space. It's got a pin layout that works well with the Mini or the Basic Stamp (TX, RX, ATN, GND on one top, power and ground on the other).
- The Nano can be powered via the Mini-B USB connection, 7-12V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source.
- You could download the driver of Elegoo Nano V3.0 at: http://bit.ly/2pMF4in
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- The Elegoo Nano Board is a compact and breadboard-friendly board based on the ATmega328P and it works with a mini USB cable.
- The Elegoo Nano can be powered via USB connection, 6-12V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27).
- The Elegoo Nano has a variety of facilities for communicating with a PC or other microcontrollers.
- The Elegoo Nano is resetable by software running on a connected computer.
Elegoo Nano Board
Nice Boards of good price.
Windows driver installation is easy.
Low power consumption.
The header pins are not soldered.
Input and Output
Each of the 14 digital pins on the Nano can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. Some pins have specialized functions:
Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the corresponding pins of the CH340G USB chip.
External Interrupts: 2 and 3.
PWM: 3, 5, 6, 9, 10, and 11.
SPI communication: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK).
LED: 13. HIGH value, the LED is on; and LOW for off.
Each of 8 analogue inputs provide 10 bits of resolution, some pins have specialized functions: I2C: 4 (SDA) and 5 (SCL).
Other pins on the board: AREF and Reset.
Classic LED Project with Nano Board
This example project shows the simplest thing you can do with an Elegoo Nano to see physical output: it blinks the on-board LED just like the star in the sky.
Hardware needed for this project:
1 x Nano Board
1 x Mini USB Cable
1 x Breadboard
2 x Wires
1 x 5MM LED
1 x 220 ohm Resistor
Operating Voltage: 5 V
Input Voltage: 7-12 V
Clock Speed: 16 MHz
Analogue IN Pins: 8
Digital I/O Pins: 14 (6 of which are PWM)
DC Current per I/O Pins: 40 mA (I/O Pins)
Flash Memory: 32 KB of which 2 KB used by bootloader
SRAM: 1 KB
EEPROM: 1 KB
PCB Size: 18 x 45 mm
Power Consumption: 19 mA
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In order to use these Arduinos Nanos you will need to be able to program them and this will require a USB to USB Mini cable as no cables are supplied. The first thing I did was to plug them in to my PC and the LEDs lit up to show that whilst they did accept power there was an error message generated by the Arduino software as no bootloader is installed. I knew this when I ordered them so I was fully aware of this. I had watched a few youtube videos and was quietly confident that I was capable of installing a Nano bootloader onto them. This would require either the use of a separate programming board such as a USBTinyISP or using another Arduino (I used an UNO clone).
So to use these you will need to be able to solder (or know someone who can), but if you use a small tip and some liquid flux it is not too onerous.
Once you have your board soldered up (or at the very least the 6 ICSP pins) then you can begin to load your bootloader onto the Nano using some (6) female to female or female to male jumper leads (depending on your donor board) . I followed the instructions from the Industuctables website How-To-Burn-a-Bootloader-to-Clone-Arduino-Nano but I made a slight departure from the instructions in that (as I discovered in another youtube video by Julian Ilett Turn an Arduino Nano into an Uno) you can run an Arduino Uno bootloader which uses less of the Nano's memory and has a faster bandwidth.
These are great for the money and I will keep coming back for more.
* Without a little soldering work these boards are useless. I find the best way to hold the header pins at the right angle for soldering is to insert them in a breadboard and then mount the board on them, see my photos. You can see that not all my soldered joints look good, and certainly I'm not proud of them, but they work. The pin spacing is wide enough that accidentally bridging two pins seems most unlikely, so even if you've never soldered before I would encourage you to give it a go.
* The separate block of six pins is for ICSP (In Circuit Serial Programming) and unless you intend to replace the bootloader you don't have to fit it. Some of my Nano boards have the ICSP pins fitted, some don't; I've not yet needed to flash a bootloader. The ICSP pins are easily retro-fitted if the need arises.
* The boards were supplied with a bootloader installed and the Blink program in memory. This is handy because as soon as you power them you see the LED flashing and know you've got a working board. The bootloader has been fine for me with Arduino Nano as the selected board in the Arduino IDE and ATmega328P as the selected processor.
* No USB lead is supplied. The USB socket is Mini, not the much more common Micro, and that caused me some perplexity. With the first two USB-A to USB-Mini leads I tried my computer didn't recognise anything connected to the USB port, apparently those had been supplied as charging leads for things such as lanterns and cameras and were wired for power only. Fortunately a desperate rummage turned up a USB-A to USB-Mini lead wired for data also, and then I was in business.
* On the box there is a legend to the effect that a driver for the CH340 serial-to-USB chip must be downloaded. There was actually no need for that on my Windows 10 laptop because it installed a CH340 driver automatically, I cannot speak for other versions of Windows. I attach a screenshot showing where the CH340 can be found under Ports in Control Panel-System/Security-System/Device Manager. If you don't have a driver installed then the CH340 will not show under Ports and the Nano will be invisible to the Arduino IDE and in fact to the entire computer system; do note that an invisible board can also be caused by a rogue USB lead as stated above.
* The Arduino IDE, either the app or the web editor, will flag up if you haven't selected the correct board selected under Tools > Board, but once you've sorted that everything is exactly the same as working with the Uno.
* My Mac runs High Sierra 10.13.3. It did not have a driver for the CH340 and thus could not recognise the Nano board as connected. I downloaded and installed CH341SER_MAC.zip ; note that even though in System Preferences/Security & Privacy I had selected to allow apps from App Store and identified developers it was still necessary to specifically authorise installation of the driver from (chip maker) Jiangsu Qinheng Co.
You'll need to solder on the 2x3 header pins to the ICSP pads on the target board, then to build the programmer from an existing (master) board is fairly simple, it's just 6 dupont cables for a basic version, or for one with status lights, all you need are 5 additional cables, 3 x 1k resistors, 3 LEDs (I used Red for the heartbeat, Yellow for error and green for activity) and (optionally, though makes it easier) a breadboard to put it all together. If you search for "Arduino as an ISP" in a search engine you will find schematics for the pinouts on the Arduino website. Since this pack includes 3 Nanos you could upgrade two using one of them as an ICSP. All the Elegoo stuff I have bought recently has all been of high quality and this has proven to be no different.
These boards are great. They work fantastically and are a great version of the Nano. However, I noticed a small niggle today after I had updated my IDE boards to the latest version.
You need to change the Board to "Arduino Nano" and Processor to "ATMega328p (Old Bootloader)" otherwise you can't send new sketches to the boards. There must be a new bootloader available for the Nano that hasn't yet been written to these boards.
To write a new bootloader, you will need an ICSP device. You can either build one out of another Nano or use an Uno... Full details can be found online for using the "Arduino as an ISP", but I will update my review if I am able to write the new bootloader to the Nanos.
Alternatively you can just keep using the board with the ATMega328p (Old Bootloader) setting. Since mine will be used as educational devices, I want to make them as simple to use as possible and will try updating the bootloader on one of them first to make sure they work.
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