Electronic smart package tutorial

The first 01 course High and low level , A serial port ,LED The lamp

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1. Main control panel （ Analog port , Digital interface ）
2. Expansion board
3. LED The light goes on and off
4. The serial port outputs some information inside the main control board （*）
   

The first 02 course Serial port output and button

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1. Serial port output information （ Some internal states of the main control board , temperature ）, Debugging program 、 When checking the status of the hardware
2. Set the communication frequency , If the frequency is inconsistent , The output information will be garbled
3. Button controls the output
   

The first 03 course press-button control LED The lamp

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Equipment used

equipment	characteristic	species
LED The lamp	3V
Roller switch	5V	Digital devices , Only 2 States
Touch switch	5V	Digital devices

1. Learn about button clicks , What happens when a button is clicked ？ What is a click , Process one click （ Loops and variables ）
2. Use the buttons to control LED On and off
   Knowledge to prepare ： High level =1, Low level =0
   

The first 04 course Counter

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Equipment used

equipment	characteristic	species
Four digit nixie tube	5V
Roller switch	5V	Digital devices , Only 2 States

1. Add monitor
2. Number to string conversion ：12→“12” ,“1”+1 = 66 （ASCII surface ）, IIC Equivalent to I²C
   Error program ：
   
   Correct procedure ：
   

The first 05 course Application of frequency conversion technology – Candlelight lamp

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Equipment used

equipment	characteristic	species
LED	3V

• Knowledge point
  • pwm： yes Pulse width modulation ,
    Arduino The control board is preset with 1kHz and 500Hz Two different groups PWM output frequency
    Digital pin 5、6：976.5625Hz
    Digital pin 3、11、9、10：490.196Hz
    if PWM The frequency is too low , The motor will shake ,LED It will flash
    The first 6 Pin out 3.3V voltage , $\frac{168}{255}\times 5\approx 3.3$
  • random number
    （0,255）,

The first 06 course Digital and analog signals

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Equipment used

equipment	characteristic	species
Touch switch	5V
Angle sensor	5V

• Knowledge point

  • Digital and analog equipment
    • Digital devices ： Connected to analog interface , Only 2 It's worth ,0 and 1023
    • Analog equipment ： Connected to analog interface , You can get a lot of value , Value range （0,1023）
    • pwm（0,255）
    • Analog equipment and digital equipment are connected to digital interface （D）：（0,1）
  • Digital interface and analog interface
  • Is a device analog or digital
    • All connected to the analog port , See how many values there are , There are many values , Analog devices , Only two values are digital devices
    • Digital equipment can be connected to both digital interface and analog interface .

The first 07 course Automatic flower watering device

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Equipment used

equipment	characteristic	species
Soil moisture dock	5V
Buzzer	5V

• Knowledge point
  1. Analog equipment ： Data can only be obtained through analog devices , If a device like a buzzer is an output device , It can be connected to digital interface or analog interface
     

The first 08 course Using sound 、 Light control lamp on and off

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Equipment used

equipment	characteristic	species
Photosensitive sensors	5V
Sound sensor	5V
Light-emitting diode	5V

• Knowledge point
  1. Photosensitive sensors ： An analog device , The intensity of light is high , The larger the value obtained
  2. Sound sensor ： An analog device , The intensity of the sound is high , The larger the value obtained
• Project description
  1. Only the day was dark , When the intensity of the sound reaches a certain value , The light is on .