maxEmbedded - How to build an IR sensor
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- // Post: "How to build an IR sensor"
- // URL: http://maxembedded.com/2013/08/04/how-to-build-an-ir-sensor/
- // Author: Vishwam Aggarwal, VIT University
- /* DISCLAIMER
- This is the same code as given in the above URL. Though the code is tested and approved, the author
- is not responsible for any damage, physical, mental or social, which might occur due to the implementation
- of this code and its derivatives, whether in full or part thereof. Use it at your own risk.
- The user is free to modify, reuse, reproduce and distribute the code and its derivatives to any extent,
- whether for free or paid. The user can also use this code for commercial purposes. In other words,
- do whatever you want with the code!
- #define F_CPU 1000000UL
- #include <avr/io.h>
- int ch_prime(int); //Prototyping the function for testing a number to be prime or not
- int main(void)
- uint8_t num=0, res; //Creating variables 'num' & 'res' for storing the number of detections & result of the function respectively
- DDRA &= ~(1<<0); //Setting 0th pin of Port A as input
- DDRD |= (1<<0); //Setting 0th pin of Port D as output
- if (bit_is_set(PINA, 0)) //Checking if the sensor has detected something in front of it
- while (bit_is_set(PINA, 0)); // We use the 'While' function to make sure that one detection increments the value of num by only one value
- res = ch_prime(++num); //Incrementing the value of num and sending it to the function which tests it for being a prime number
- if (res==1)
- PORTD |= (1<<PIND0); //If returned value is 1, indicate prime number by pulling the 0th pin on Port D High
- PORTD &= ~(1<<PIND0); //If returned value is 0, indicate composite number by pulling the 0th pin on Port D Low
- continue; //If sensor has nothing in front of it, continue detecting
- int ch_prime(int num)
- int i; //Declaring variable 'i' to use in the for loop
- for (i=2;i<num;i++) //Run the loop for the value of i from '2' to 'num-1'
- if (num%i==0) //Check and compare to 0 the remainder when dividing num by i, if 0, then composite number
- return(0); //If Number is composite, return 0
- if (i==num) //Compare the value of i to num, if same, then prime number
- return(1); //If number is prime, return 1
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