SOURCE CODE:

#include

#include

#include

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const char$*$ ssid $=$ "Galaxy A$31$EB$61"$;

const char$*$ password $=$ "mutyam@$1234"$;

const String validQRCode$1=$ "valid$\_$qr$\_$code";

const String validQRCode$2=$ "valid$\_$qr$\_$code$\_2"$;

WebServer server$(80)$;

$//$ Define the DC motor pins for the first motor on L$298$N

const int ENA $=5$; $//$ PWM pin for speed control

const int IN$1=19$; $//$ Direction pin $1$

const int IN$2=18$; $//$ Direction pin $2$

$//$ Define the DC motor pins for the second motor on L$298$N

const int ENB $=4$; $//$ PWM pin for speed control

const int IN$3=17$; $//$ Direction pin $1$

const int IN$4=16$; $//$ Direction pin $2$

void handleRoot$()$;

void handleQRRequest$()$; $//$ Declare the handleQRRequest function

void setup$()\{$

Serial.begin$(115200)$;

WiFi.begin$($ssid$,$ password$)$;

while $($WiFi$.$status$()!=$ WL$\_$CONNECTED$)\{$

delay$(1000)$;

Serial.println$("$Connecting to WiFi..."$)$;

$\}$

Serial.println$("$WiFi connected"$)$;

Serial.print$("$IP address: $")$;

Serial.println$($WiFi$.$localIP$())$;

if $(!$MDNS$.$begin$("$esp$32"))\{$

Serial.println$("$Error setting up MDNS responder!"$)$;

while $(1)\{$

delay$(1000)$;

$\}$

$\}$

Serial.println$("$MDNS responder started"$)$;

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$//$ Set the motor control pins as outputs

pinMode$($ENA$,$ OUTPUT$)$;

pinMode$($IN$1,$ OUTPUT$)$;

pinMode$($IN$2,$ OUTPUT$)$;

pinMode$($ENB$,$ OUTPUT$)$;

pinMode$($IN$3,$ OUTPUT$)$;

pinMode$($IN$4,$ OUTPUT$)$;

server.on$("/",$ handleRoot$)$;

server.on$("/$qr$",$ handleQRRequest$)$; $//$ Now handleQRRequest is declared

server.begin$()$;

MDNS$.$addService$("$http$","$tcp$",80)$;

Serial.println$("$HTTP server started"$)$;

$\}$

void loop$()\{$

server.handleClient$()$;

$\}$

bool validateQRCode$($String qrData$)\{$

return qrData.equals$($validQRCode$1)||$ qrData.equals$($validQRCode$2)$;

$\}$

void dispenseItem$($String qrData, int tablets$)\{$

Serial.println$("$Dispensing item..."$)$;

int rotationTime $=1000$; $//$ Adjust this time based on your motor speed to achieve a $360$ degree

rotation

int rotations $=$ tablets; $//$ Each tablet corresponds to one rotation

$//$ Rotate the appropriate motor based on the QR code

for $($int i $=0$; i $<$ rotations; i$++)\{$

if $($qrData$.$equals$($validQRCode$1))\{$

$//$ Motor $1$

digitalWrite$($IN$1,$ HIGH$)$; $//$ Set motor direction

digitalWrite$($IN$2,$ LOW$)$;

analogWrite$($ENA$,255)$; $//$ Set motor speed to maximum $(255)$

$\}$ else if $($qrData$.$equals$($validQRCode$2))\{$

$//$ Motor $2$

digitalWrite$($IN$3,$ HIGH$)$; $//$ Set motor direction

digitalWrite$($IN$4,$ LOW$)$;

analogWrite$($ENB$,255)$; $//$ Set motor speed to maximum $(255)$

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$\}$

delay$($rotationTime$)$; $//$ Wait for the motors to complete one rotation

if $($qrData$.$equals$($validQRCode$1))\{$

analogWrite$($ENA$,0)$; $//$ Stop motor $1$

$\}$ else if $($qrData$.$equals$($validQRCode$2))\{$

analogWrite$($ENB$,0)$; $//$ Stop motor $2$

$\}$

delay$(500)$; $//$ Wait before the next rotation

$\}$

Serial.println$("$Item dispensed"$)$;

$\}$

void handleQRCode$($String qrData, int tablets$)\{$

if $($validateQRCode$($qrData$))\{$

Serial.println$("$QR Data is valid"$)$;

dispenseItem$($qrData$,$ tablets$)$;

$\}$ else $\{$

Serial.println$("$QR Data is invalid"$)$;

$\}$

$\}$

void handleQRRequest$()\{$

if $($server$.$args$()>0)\{$

String qrData $=""$;

int tablets $=1$; $//$ Default to $1$ tablet if not specified

for $($uint$8\_$t i $=0$; i $<$ server.args$()$; i$++)\{$

if $($server$.$argName$($i$)=="$qr$")\{$

qrData $=$ server.arg$($i$)$;

$\}$

if $($server$.$argName$($i$)==$ "tablets"$)\{$

tablets $=$ server.arg$($i$).$toInt$()$;

$\}$

$\}$

handleQRCode$($qrData$,$ tablets$)$;

$\}$

server.send$(200,$ "text$/$plain$","$QR Code processed"$)$;

$\}$

void handleRoot$()\{$

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const char webpage$[]$ PROGMEM $=$ R$"=====($

Tablet Dispenser

Press the button to dispense an item: