Question

Turn in a cleanly formatted version of the code, and a sample print-out of at least 10 readings. HINT: Use the "Auto Format" function in the "Tools" menu Write an Arduino program to measure the output of the salinity sensor. Use a photoresistor instead of the salinity sensor to debug the program. Your program should perform the following steps in a continuously repeating loop: Turn on the sensor by setting the digital output pin HIGH. b. Wait 100 milliseconds (see comment-about-not using delay, bclow) 1. a. Make n readings of the sensor, where n is a variable. For testing, use n =15. c. d. Turn off the sensor e. Average the readings f. Convert the average value to voltage g. Print the time and voltage value to the Serial Monitor. h. Wait 100 milliseconds

Answer 1

​​​​​​

SOLUTION : To write an Arduino program to measure the output of the salinity sensor. So, here the average is a measure of central tendency.Therefore, 12 = - I i i= 1

void salinity_reading_stats( int power_pin, int input_pin, int nave, float *ave, float *stdev )

{

int i, n=15;

float sum; // Use a float to prevent overflow

float reading[BUFFER_LENGTH]; // Array to store readings

n = min( nave, BUFFER_LENGTH ); // Make sure we don't over-run the data buffer

// -- Store readings in an array

for ( i=0; i<n; i++ ) { // First array index is 0, last is n-1

digitalWrite( power_pin, HIGH ); // Turn on the sensor

delay(100); // Wait for sensor to settle

reading[i] = analogRead( input_pin ); // Add reading to the running sum

reading = analogRead( input_pin ); // Read voltage

digitalWrite( power_pin, LOW ); // Turn off power to the sensor

delay(100); // wait between readings

}

// -- Compute average and standard deviation.

for ( sum=0.0, i=0; i<n; i++ ) {

sum += reading [i];

}

*ave = sum/float(nave);

for ( sum=0.0, i=0; i<n; i++ ) {

sum += pow(reading[i] - *ave, 2);

}

*stdev = sqrt( sum/float(n-1) );

}