Jianlin Cao

This week’s assignments

measure something: add a sensor to a microcontroller board that you've designed and read it

TCRT 5000 is a reflective optical sensor with transistor that typically used by line followers. It is a simple analog sensor.

PCB

Top View

Side View

The LED with flashing in different speed according to the input.

Code

#define LED 3
#define IR A2
int adc=0;

void setup()
{
  pinMode(LED, OUTPUT);
}

void loop()
{
  digitalWrite(LED,HIGH);
  adc=analogRead(IR);
  delay(adc);
  digitalWrite(LED,LOW);
  delay(256-adc);  
}

Get the files

You can download the source files directly.