Second, the production of Arduino

2.1 Obtaining schematics and PCB boards

Learning Arduino necessarily need to have an Arduino board, either buy or make their own, because the Arduino website provides each type of schematic and PCB, so the production is very convenient. The following is the production of our Arduino UNO Compatibility board Sagoo Uno. We've made some improvements and replacements based on the official Arduino UNO schematic, and here's how the official board looks compared to our board:

Main device comparison:

 	processor	USB to serial port	5V power supply	3.3V power supply	Power selection control circuit	Power selector switch
official Arduino UNO	Atmega328p-pu	ATMEGA16U2 Simulation implements	1117-5v	Lp2985-33dbvr	lmv358	fdn340p
ch340g dedicated chip	1117-5v	XC6206P332MR	LMV358	fdn340p

The main changes include selecting the ATMEGA328 of the SMD package; using professional USB to serial port chip ch340g instead of MCU, not only reduce the cost, but also ensure the stability of the communication, in the latest operating system Win8 and Mac can be stable work The XC6206 can provide a maximum of 200mA current, and the LP2985 maximum can provide 150mA current.

Official Arduino UNO schematic diagram and PCB download link: https://www.arduino.cc/en/Main/ArduinoBoardUno

Sagoo uno schematic download link: http://pan.baidu.com/s/1mgL37V6

2.2 Burning Write Bootload

With the schematic and PCB data, after processing to get the real Arduino plate welding. This time the circuit board can not be used, must be burned into the underlying code bootload, burn write can be implemented in a variety of ways, commonly used in the use of burning writing tools and Arduino IDE software, commonly used to write tools are also many, such as AVR ISP, Usbasp,usbtinyisp, It is recommended to use Usbtinyisp.

Welded Sagoo UNO Board

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Use the Usbtinyisp on the right to write bootload to the UNO board

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Connect Uno and PC with USB cable, open the blink example that comes with the Arduino IDE software, compile and download to Sagoo UNO board

2.3 Observation Results

When you are done with the above steps, if everything is normal, you will see that the signal indicator light on the UNO board flashes at a frequency of 1Hz. If the end result is wrong, then ... Oh... Check it slowly!

Second, the production of Arduino