simple ardunio projects

   C ontrolling of led using voice commands through  Bluetooth code for Arduino board void setup() {   // put your setup code here, to run once: pinMode(13,OUTPUT); Serial.begin(9600); } String voice; String voice1="hi"; void loop() {   // put your main code here, to run repeatedly: if(Serial.available()>0) {   voice="";   delay(2);   voice=Serial.readString();   delay(2);   Serial.println(voice);   if(voice==voice1)   {     Serial.println("ok");     digitalWrite(13,HIGH);   }else if(voice=="stop")   digitalWrite(13,LOW); } } OUtput

 controlling of led using Bluetooth and Arduino through string compare  code Arduino program String data; void root(String ); void setup() {   pinMode(13,OUTPUT);   digitalWrite(13,LOW);   Serial.begin(9600);   } void loop() {   root(data);   if(Serial.available())   {     data=Serial.readString();     Serial.println(data);     if(data== '4')     digitalWrite(13,HIGH);     else     digitalWrite(13,LOW);       } } void root(String data1) {   String str="mystringname"; if(Serial.available()) {   String data1=Serial.readString();  // Serial.write(data1);   Serial.println(data1);   if(data1==str)   {     digitalWrite(13,HIGH);   }     else    {     digitalWrite(13,LOW);   } } } OUTPUT 13 th led will high whe...