Question

Improved Sensor Readings a. The name of this program will be lab3p2. Copy the program from lab2p1, as that is the most similar to this program. b. Readings from sensors are prone to noise. A typical way to reduce the noise and hence, improve the accuracy of a reading is to take multiple readings and average! From statistics we learn that the accuracy improves with VN, where N is the number of reading. c. If you want to improve the accuracy of a sensor reading by a factor of 10, how many readings would you need to average? d. We are going to limit the number of readings to 10. By how much will we improve the accuracy? e. Write the function proto-type for function read voltage (pin) that has an integer pin number as the input and the real-valued voltage as the output. f. Inside function read voltage (), take 10 readings from the analog pin, average them (using real-valued division), and convert to a range of OV to sv. g. Write a program, calling function read voltage () from inside function loop() to display accurate readings from the potentiometer (pin = 1), with formatted output on the serial monitor as shown below: Voltage 0.4063 0.4062 in the program. Show the results to the TA. Each student upload the source file to Canvas. Signature: Date: (0/1/2 points)

in arduino

Answer 1

Ans! () FROM (b) the accuracy of sensor reading improves with soot n with a number of readings. in order to increase the accuracy by a factor of 10 ie, wn=10 N=100 so we need to aveYoge loo sensor readings d) The numble of reading is limited to lo. itin=100 YOC Accuracy of sensor reading is given by VN = VIO Accuracy of sensor reading = V10 - 3.16 227 times e) The function Prototype is given as Mloat read- voltage lint pin): llas it read pin delare cohin is an integen Ond returns Voltage value which is a float A ll function derinition floor read=voltage (int pin) { int pot- val=0; llvariable to store dava read from the input din int sum-data = 0; /variable to store the sum of doua taken 10 times 11 loop to read data times for (int izo: 1210; i++) { pozval = analog peod (pin); ll reading the analog coa from the pin co-1023) sum-dalat - potoval ; // Taking the sum of the regio'ng's int avg.dwo - sum-doo/10; II Taking the average of the lo seadings taken

float voltage cang-data 1023*5;ll Conver (0-1023) analog values to (0-5) voltage values return voltage ; ll returning the value 2 #define pot-pin all pin in which potentiometer is connected Il function definition float tread - voltage (int pin) { 10t sum- data o ll voqiable to store the slem Of dara taken lo times 11100p, to read data 10 times for (int i=0; i<10; i++) { potoval = analog Read(pin); II reading the analog dewa from the pin Co-1023) sum-dalat = Pot-val; // Taking the sum of the readings int avg.douta = sum- dava (10; 11 taring the are yage of the lo readings taken float voltage - avg-data/1023 *5;ll convex (0-1023) analog values to (0-5) Voltage values return voltage ill returning the value I setup function void setup() { Serial.begin(115200); /1 For Enabling serial printing pin mode (pot-Pin, INPUT); Il scuting potentiomerce pin to input

11 Loop void loop() { int pot-val; floal formated-por-val formared - por-VA) = read - voltage (por-pin), I reading the ave faze Of 10 reidings in voltage seglial printinchoat (Pot-Val * 1023/5)); llaccu reude reading from - potentiometer Gesicil, printin (formared - pot-val); 11708 malted output.