悍人生 does not need to explain, handmade Arduino development board

To be honest, this article may scare you. After all, it is necessary to handmade a development board. Arduino, the engineer in Block should know that I don't know such a simple and easy to use, and there is a huge user community, and the platform for developing ecological complete (whether hardware or software) is actually not fire, which is very surprised. After all, Arduino is full, you can achieve simple LED control projects, but also realize complicated follow-up robots, robotic arms, ecological, easy to introduce, and is more advantages (laugh ~). Therefore, this article will use some simplest devices and to build an Arduino development board through extremely simple way. It is interested that this is a good job, especially in this year, there is a national college e-design contest, if you can be here The article is absorbed on the inspiration, which may be amazing (smile CRY ~). The features of the Arduino development board include basic digital input / output pins, analog input pins, PWM, interrupts, etc. How should we start? What do you need to prepare? Two points: One is the basic schematic design tool. If everyone uses yourself. The other is to reduce the difficulty of handmade, and do not consider using a USB turn serial chip, but use atmega328p SPI pins (Microcontroller on Arduino UNO) to burn bootloader and upload procedures, which greatly reduces circuit design. Difficulty, after all, we are going to handmade. Circuit diagram design, the schematic is as follows, but it is relatively simple. (Click to enlarge View original map) Device list: Atmega328p microcontroller 28PIN IC 16 MHz crystal Capacitor: 2 x 22pf, 100nf, 2x47μF Resistance: 2x330Ω, 470Ω, 1kΩ, 2.2kΩ, 7.5kΩ, 2x10KΩ, 30KΩ LED x 2 (red and green) Button (for reset) ON / OFF 5V regulator (7805) 3.3V regulator (LD33V) 10kΩ potentiometer 1N4007 diode IRF540N MOSFET Other small objects (interface terminals, public, female, 2.1mm power Jack, cave board, etc.) Of course, some devices can be actually modified according to your own needs, the above is only the list of devices required by the Arduino development board in this article. The effect of practical manual DIY works. To explain the functions of each part: A MOSFET is used to drive the motor, connected to D5, so PWM control can also be implemented. For analog input A0, a 10kΩ potentiometer is connected. The analog input A1 is connected to a voltage divider consisting of 30 kΩ and 7.5 kΩ resistors, and can directly measure the input voltage of up to 25V. The TX and RX pins provide 3.3V logical options. A sliding switch can open and close the Arduino development board. Two LEDs: One is the power to turn on the LED and the other is the user LED connected to D13. All analog and numbers (and power) connections have public and female. A separate 4PIN mother head is used for programming. In the power pins, it provides options for 3.3V, 5V, and 12V. in conclusion Is it quite interesting, when you personally participate in the hands-handed circuit board this wonderful taste is only a person in which it can experience it, if you are Crazy, I also like to play like this, I will wish to do DIY a PK. .