LinkIt ONE Tutorial - Marquee
Introduction
What We’re Doing
The experiments in the previous sections used only one LED but to show dazzling light effects lets use three LEDs. Make connections as shown in the Fig 4.2 and upload the code given below and observe the changes that happens.
Things you need
- LinkIt One x 1
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Break board x 1
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Resistors 330Ω,1kΩ x 3
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5mm LED x 3
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Transistor(2N3904) x 3
Schematic
Connection
Code
Please click on the button below to download the code for the kit:
You can unzip the file to the Examples folder of your Arduino IDE.
To access the demo code open:
File -> Examples -> Starter Kit for LinkIt -> Basic -> L4_Control_LEDs
const int pinLed1 = 2; // pin of led1
const int pinLed2 = 3; // pin of led2
const int pinLed3 = 4; // pin of led3
void setup()
{
pinMode(pinLed1, OUTPUT); // set all pin OUTPUT
pinMode(pinLed2, OUTPUT);
pinMode(pinLed3, OUTPUT);
}
void loop()
{
digitalWrite(pinLed4, LOW); // led4 off
digitalWrite(pinLed1, HIGH); // led1 on
delay(100);
digitalWrite(pinLed1, LOW); // led1 off
digitalWrite(pinLed2, HIGH); // led2 on
delay(100);
digitalWrite(pinLed2, LOW); // led2 off
digitalWrite(pinLed3, HIGH); // led3 on
delay(100);
digitalWrite(pinLed3, LOW); // led3 off
digitalWrite(pinLed4, HIGH); // led4 on
delay(100);
}
Troubleshooting
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Check the polarity of the LED’s.
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Ensure that you have connected the LED’ to the correct port pins.
Making it better
Upload the following code with the same breadboard connection in order to obtain different flashing effects.
To access the demo code open:
File -> Examples -> Starter Kit for LinkIt -> Extend_Lesson –> L4_Control_LEDs_Speed
More ideas
Modify the existing code such that the frequency of LED blinking increases.
Reference
Help us make it better
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