introduction to Digital Electronics Install the Arduino IDE on your laptop if you haven t already!
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1 introduction to Digital Electronics Install the Arduino IDE on your laptop if you haven t already!
2 Electronics can add interactivity! Any sufficiently advanced technology is indistinguishable from magic - Arthur Clark.
3 Electronics can add interactivity! Any sufficiently well executed technology is indistinguishable from magic - in the eyes of kids!
4 Electronics can be complex
5 Electronics can be complex
6 Avoid unnecessary complexity!
7 Let s look at a circuit! + Battery Light Bulb -
8 Let s look at a circuit! + Battery Power Source - Load Light Bulb
9 Let s look at a circuit! + Battery Power Source Resistor - Load
10 Let s look at a circuit! Battery Power Source + 330Ω Resistor - Load V = IR 5 = I 330 Voltage = Current Resistance Volts Amps Ohms Current 0.015A
11 Let s look at a circuit! Ω
12 Let s look at a circuit! 0v Ω
13 Let s look at a circuit! 0v Ω
14 Let s look at a circuit! Ω 0v V1 Vref V 1 - V ref = IR
15 Let s look at a circuit! 0v Ω
16 Let s look at a circuit! + 330Ω 0v - 330Ω 0v
17 Let s look at a circuit! 330Ω 0v
18 Time for some LIGHT! 330Ω LED Light Emitting Diode 0v
19 Time for some LIGHT! 330Ω Longer is positive! LED Light Emitting Diode 0v Diodes conducts current primarily in one direction Needs resistor!
20 Time for some LIGHT! 330Ω 0v + - Longer is positive! LED Light Emitting Diode
21 Now in real life! Power Rails 330Ω 0v
22 Now in real life! Power Rails 330Ω 0v
23 Now in real life! Power Rails 330Ω 0v
24 Now in real life! 330Ω 0v
25 Now in real life! 330Ω 0v
26 Now in real life! 330Ω 0v Momentary Switch
27 Modify your circuit 330Ω 0v
28 A closer look 330Ω VCC (also Vdd, Vhigh) Voltage Common Collector (usually your power supply!) V2 - VGND = 1.4V V2 0v VGND LED Forward Voltage Drop 1.4V 0Ω Components have rules!
29 A closer look 330Ω 0v V2 VCC (also Vdd, Vhigh) Voltage Common Collector (usually your power supply!) VGND LED Forward Voltage Drop 1.4V 0Ω Components have rules! V2 = 1.4V VCC - V2 = I R = I 330 I 10 ma
30 A closer look VCC 330Ω V2 0v VGND I 10 ma
31 A closer look VCC VCC 330Ω V2 LED Max Current 20mA V = IR 0v VGND 0v VGND I 10 ma I BIG NUMBER
32 Digital vs Analog Circuits Analog Circuits Range of voltages Usually requires math! Digital Circuits Usually 2 distinct voltages (high & low) and 0v (roughly)
33 Using your Arduino! A Microcontroller.. or a small computer! Has inputs and outputs you can control Teensy Arduino Uno Arduino Nano
34 Using your Arduino! - +
35 Blink! - +
36 Blink! R- - + G B - Try making the colors alternate! - +
37 Pulse Width Modulation PWM! Digital is only 0v or, so how do we get values in between? 0v 50% of the time on, 50% of the time off 50% Duty Cycle LEDs can only be in 2 states- on or off! PWM to make the LED seem dimmer 0v 90% of the time on, 10% of the time off 90% Duty Cycle
38 PWM Pins marked ~ can use PWM
39 Servo and Moving Parts Rotary actuator that allows for precise control of linear position Arduino friendly! Built-in Library SIGNAL (Pin 6) POWER (5V) GND
40 Button Inputs Arduino Digital Pin 8 Big resistor! > 1kΩ What does the Arduino sense when it s not connected to GND? Value is floating! Pull up resistor!
41 Button Inputs Arduino Digital Pin 8
42 Button Inputs Arduino Digital Pin 8
43 Button Inputs Arduino Digital Pin 8
44 LED strips A strip of LEDs
45 Individually Addressable LED strips! Objectively pretty neat! Integrated Circuit & I 2 C communication ws2812 RGB LED Run on and can be controlled with an Arduino! Watch out for current! Each color ~ 15mA, total 50mA on white. Arduino max current ~1A
46 Projects for you to try Easy: Servo Steering One button turns the servo 90 clockwise, the other turns the servo 90 counterclockwise! Light Switch Pressing a button turns the light on. Pressing the button again turns the light off! Medium: Random Traffic Lights Have a RGB LED change to a random color every couple of seconds! Color Mixer Have 3 buttons that control the colors of a single RGB LED. Depends on which button is pressed, the light shows a different color! Challenging Night Light Using a photodiode, make a light turn on only when it s dark! Reflex Game Make a simple reflex game out of 1 LED and 1 Button. When the light turns on, see how fast you can press the button. Make a simple scoreboard using the WS2812 Lights!
47 To be Continued Electronics Part II! Communication Wireless Perf boards Soldering And more! Take anything you d like to keep with you (you can use these on your toys/sketch models)
48 introduction to Digital Electronics
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