DI Electronics Workshop
From Wikicliki
Basic Circuits
- LED - small side = long leg = positive
- Connectors - red wires positive / black wires negative or ground (why GND? GND = grounding for discharge)
- Resistor - if you didn't have it the LED would blow / it makes sure the led does not draw all of the 5v current / 220 Ohms Resistor - red red brown is 22 *10
- Resistance is calculated in ohms. So how do we figure out the current? The Lab power supply has a switch for amps/volts you can see its about 0.01.
- V=IR: See more about Ohm's Law
- Using Multimeter: solid line dc, wavy line ac, turn to 20
- Variable Resistor: aka Rotary Potentometer [use middle pin and side pin]
Arduino
- the big brick is the microcontroller
- spk16000 - oscilator - crystal
- push up and push down resistor - if you put it before or after the led - but it works like a kind of pipe anyway it seems, if the pipe is smaller then less will flow overall...
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int yellowled = 9;
int myButton = 10;
int buttonVal = 0;
void setup(){
pinMode(myButton, INPUT_PULLUP);
pinMode(yellowled, OUTPUT);
}
void loop(){
buttonVal = digitalRead(myButton);
if (buttonVal == HIGH) {
digitalWrite(yellowled, HIGH);
}
else {
digitalWrite(yellowled, LOW);
}
}
//fade in and out when clicked
buttonVal = digitalRead(myButton);
analogWrite(yellowled, brightness);
if (buttonVal == LOW){
int newAngle = potValue;
if (brightness < 255){
brightness = brightness + fadeAmount;
}
}
if (buttonVal == HIGH){
int newAngle = 90;
if (brightness > 0){
brightness = brightness - fadeAmount;
}
}
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#include <Servo.h>
int potValue = 0;
int potPin = A0;
int servoPin = 8;
int servoAngle;
Servo myServo;
void setup() {
Serial.begin(9600); //SERIAL MONITOR
potValue = 0;
myServo.attach(servoPin); //servoAngle
}
void loop() {
potValue = analogRead(potPin);
Serial.println(servoAngle);
servoAngle=map(potValue,0,1023,0,180); // ummappen auf degrees
servoAngle=constrain(servoAngle, 0, 180); // defensive coding: servo davon abhalten unkontrolliert durchzudrehen
myServo.write(servoAngle);
}
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Thoughts/Questions
- IOIO is an android/bluetooth module. Why should one use that over a wifi shield with xively?
- How do I run pure data?
Trivia & other interesting things
- UK Mains has a 50Hz hum. Depending on where or what time (eg: when eastenders ends and everyone puts on the kettle) this hum will change. It is alleged that you can find out what time or location it is from the hum - mains hum signature. From wikipedia: "Electrical network frequency (ENF) analysis is a forensic technique for validating audio recordings by comparing frequency changes in background mains hum in the recording with long-term high-precision historical records of mains frequency changes from a database. In effect the mains hum signal is treated as a time-dependent digital watermark that can be used to find when the recording was created, and to help to detect any edits in the sound recording"
- IOIO: https://www.sparkfun.com/tutorials/280
- Circuits.io: http://www.circuits.io/circuits/new
