Ks0173 keyestudio Nano ch340: Difference between revisions

Revision as of 09:54, 27 November 2020

Keyestudio Nano ch340

Introduction

keyestudio Nano CH340 is a small, complete, and breadboard-friendly board based on the ATmega328P-AU. Compared with ARDUINO NANO, the USB-to-serial port chip used in keyestudio Nano is CH340G, so that the using method is the same except the driver installation file.
It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 8 analog inputs, a 16 MHz crystal oscillator, a mini USB port, an ICSP header and a reset button.
Note that ICSP (In-Circuit Serial Programming) header is used to program the firmware to ATMEGA328P-AU, but generally the chip has been preburned before leave the factory. So use it less.
The keyestudio Nano can be powered via the Mini-B USB connection, or female headers Vin/GND (DC 7-12V).

Specification

Microcontroller	ATmega328P-AU
Operating Voltage	5V
Input Voltage (recommended)	DC7-12V
Digital I/O Pins	14 (D0-D13) (of which 6 provide PWM output)
PWM Digital I/O Pins	6 (D3, D5, D6, D9, D10, D11)
Analog Input Pins	8 (A0-A7)
DC Current per I/O Pin	40 mA
Flash Memory	32 KB of which 2 KB used by bootloader
SRAM	2 KB
EEPROM	1 KB
Clock Speed	16 MHz
LED_BUILTIN	D13

Element and Interfaces

Here is an explanation of what every element and interface of the board does:

1	ICSP Header	ICSP (In-Circuit Serial Programming) Header ICSP is the AVR, an micro-program header consisting of MOSI, MISO, SCK, RESET, VCC, and GND. It is often called the SPI (serial peripheral interface) and can be considered an "extension" of output. In fact, slave the output devices under the SPI bus host. When connecting to PC, program the firmware to ATMEGA328P-AU.
2	LED indicator（RX）	Onboard you can find the label: RX(receive ) When control board communicates via serial port, receive the message, RX led flashes.
3	LED indicator（TX）	Onboard you can find the label: TX (transmit) When control board communicates via serial port, send the message, TX led flashes.
4	LED indicator（POW）	Power up the control board, LED on, otherwise LED off.
5	LED indicator（L）	There is a built-in LED driven by digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.
6	RX0（D0）TX1（D1）D2-D13	It has 14 digital input/output pins D0-D13 (of which 6 can be used as PWM outputs). These pins can be configured as digital input pin to read the logic value (0 or 1). Or used as digital output pin to drive different modules like LED, relay, etc.
7	RST	Reset pin: connect external button. The function is the same as RESET button.
8	MEGA 328P	Each board has its own microcontroller. You can regard it as the brain of your board. Microcontrollers are usually from ATMEL. Before you load a new program on the Arduino IDE, you must know what IC is on your board. This information can be checked at the top surface of IC. The board’s microcontroller is ATMEGA328P-AU. More info. see the datasheet
9	MINI USB	The board can be powered via Mini-B USB connection. Also upload the program to the board via USB port.
10	3V3 pin	rovides 3.3V voltage output
11	REF	Reference external voltage (0-5 volts) for the analog input pins. Used with analogReference().
12	A0-A7	The Nano has 8 Analog Pins, labeled A0 through A7.
13	5V pin	Provides 5V voltage output
14	GND	Ground pin
15	VIN	Input an external voltage DC7-12V to power the board.
16	Reset Button	Used to reset the control board
17	CH340G	USB-to-serial port chip, converting the USB signal into Serial port signal.
18	AMS1117	Convert the external voltage input DC7-12V into DC5V, then transfer it to the processor and other elements.

Specialized Functions of Some Pins

Serial communication: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data.
PWM (Pulse-Width Modulation): D3, D5, D6, D9, D10, D11
External Interrupts: D2 (interrupt 0) and D3 (interrupt 1). 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 attachInterrupt() function for details.
SPI communication: D10 (SS), D11 (MOSI), D12 (MISO), D13 (SCK).
IIC communication: A4 (SDA); A5(SCL)

Windows System

Download the Arduino IDE

When getting this control board, we need to install Arduino IDE.

Enter the website https://www.arduino.cc/，click and

Select versions you want to download, the latest version could be downloaded.

Alternatively, you could select previous release.
In this project, we use 1.8.12 version.

Click to view the below page

Click to download an installer of Arduino 1.8.12 version，which needs to be installed manually. When you tap a zip file of Arduino 1.8.12 version will be directly downloaded, and you only need to unzip it to finish installation.

Click iconto download Arduino IDE.

Installing the Driver

The driver will be installed after downloading Arduino IDE.

If your system is Windows 10, the computer will automatically install driver.
For other systems, like Windows7, we need to install driver manually.
The USB to serial chip of control board is CH340G, therefore, we will install the driver(usb_ch341_3.1.2009.06) for it.
Connect control board to computer with USB cable.
Click Computer----- Properties----- Device Manager, as shown below:

Then right-click on the device and select the top menu option (Update Driver Software...) shown as the figure below.

Then it will be prompted to either “Search Automatically forupdated driversoftware” or “Browse my computer for driver software”. Shown as below. In this page, select “Browse my computer for driver software”.

After that, select the option to browseand navigate to the “drivers” folder of usb-ch341 installation.

Once the software has been installed, you will get a confirmation message. Installation completed, click “Close”.

Up to now, the driver is installed well. Then you can right click “Computer” —>“Properties”—>“Device manager”, you should see the device as the figure shown below.

Connect the board

Connect the NANO board to your computer using the USB cable. The power LED should go on.

Step4| Select the Arduino Board

Open the Arduino IDE, you’ll need to click the “Tools”, then select the Board that corresponds to your Arduino.

Setting IDE for new bootloader

Arduino Nano board could burn new and old bootloader. New bootloader is only compatible with 1.8.9 IDE and above. Yet the old one is compatible with all versions.

Select your serial port

Select the serial device of the Arduino board from the Tools | Serial Port menu.
Note: to avoid errors, the COM Port should keep the same as the Ports shown on Device Manager.

Upload the Code

Below is an example code for displaying the Hello World! Copy and paste the code to the Arduino environment IDE.

///////////////////////////////////////////////////////////////////////////////////////////////
int val; 
int ledpin=13; 
void setup()
{
Serial.begin(9600); 
pinMode(ledpin,OUTPUT);
}
void loop()
{
val=Serial.read();
if(val=='R')
{
digitalWrite(ledpin,HIGH);
delay(500);
digitalWrite(ledpin,LOW);
delay(500);
Serial.println("Hello World!");
}
}
///////////////////////////////////////////////////////////////////////////////////////////////

Then click verify button to check the errors. If compiling successfully, the message "Done compiling." will appear in the status bar.

After that, click the “Upload” button to upload the code. If the upload is successful, the message "Done uploading." will appear in the status bar.

Step8| Open the Serial Monitor

After that, click the button to open the serial monitor.

Then set the baud rate to 9600, enter an “R” and click Send, that is, the computer will send the character R. When NANO board receives it, you should see the RX led on the board flash once, and then D13 led flash once; when keyestudio NANO board sends "Hello World!" to the computer, finally you should see the "Hello World!" is showed on the monitor, and TX led on the board flash once.