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coding void setup() { pinMode(2,OUTPUT); // in1 pinMode(3,OUTPUT); // in2 pinMode(4,OUTPUT); // in3 pinMode(5,OUTPUT); // in4 pinMode(7,INPUT); // RF in1 pinMode(8,INPUT); // RF in2 pinMode(9,INPUT); // RF in3 pinMode(10,INPUT); // RF in4 Serial.begin(9600); } void loop() {   int RF1, RF2, RF3, RF4;   RF1 = digitalRead(7);   RF2 = digitalRead(8);   RF3 = digitalRead(9);   RF4 = digitalRead(10);     if(RF1) //forward     {       digitalWrite(2,HIGH);       digitalWrite(3,LOW);       digitalWrite(4,HIGH);       digitalWrite(5,LOW);       Serial.println("0");     }     if(RF2) //backward     {       digitalWrite(2,LOW);       digitalWrite(3,HIGH);       digitalWrite(4,LOW);       digitalWrite(5,HIGH);       Serial.println("1"); ...

Coding void setup() { pinMode(2,OUTPUT); //in1 pinMode(3,OUTPUT); //in2 pinMode(4,OUTPUT); //in3 pinMode(5,OUTPUT); //in4 Serial.begin(9600); } void loop() {   if(Serial.available()>0)   {     char cmt = Serial.read();     Serial.println(cmt);         if(cmt == '0') //forward     {       digitalWrite(2,HIGH);       digitalWrite(3,LOW);       digitalWrite(4,HIGH);       digitalWrite(5,LOW);       Serial.println("0");     }     else if(cmt == '1') //backward     {       digitalWrite(2,LOW);       digitalWrite(3,HIGH);       digitalWrite(4,LOW);       digitalWrite(5,HIGH);       Serial.println("1");     }     else if(cmt == '2') //right     {       digitalWrite(2,HIGH);       digitalWri...

Coding #define trig 5 #define echo 4 void setup() {   Serial.begin(9600);   pinMode(trig,OUTPUT);   pinMode(echo,INPUT);   pinMode(13,OUTPUT);   pinMode(12,OUTPUT);   digitalWrite(12,HIGH);   delay(2000); } void loop() {   digitalWrite(13,HIGH);   digitalWrite(12,LOW);   delay(1000);   digitalWrite(13,LOW);   digitalWrite(12,HIGH);   delay(2000);     long duration , distance;     digitalWrite(trig,LOW);   delay(2);   digitalWrite(trig,HIGH);   delay(2);   digitalWrite(trig,LOW);     duration= pulseIn(echo,HIGH);   distance=(duration/2)/29.1;   Serial.println(distance); }

arduino with 2 led blink using millis int period = 2000; unsigned long time_now = 0; unsigned long time_now2 = 0; int led_state1 = false; int led_state2 = false; void setup() {   pinMode(13,OUTPUT);   pinMode(12,OUTPUT);   Serial.begin(9600); } void loop() {   if(millis() > time_now + period){     time_now = millis();     led_state1 = !led_state1;     digitalWrite(13,led_state1);   }    if(millis() > time_now2 + 1000){     time_now2 = millis();     led_state2 = !led_state2;     digitalWrite(12,led_state2);      }    }

that LCD coding is not available in internet. so that rare coding. so if you want download that..or copy that Coding for ultrasonic with LCD import RPi.GPIO as GPIO import time def get_distance():     GPIO.output(trig, True)     time.sleep(0.0001)     GPIO.output(trig, False)     srt = 0     fsh = 0     while GPIO.input(echo) == False:         srt = time.time()     while GPIO.input(echo) == True:         fsh = time.time()     dif = fsh - srt     dis_cm = dif/0.000058     return dis_cm # Define GPIO to LCD mapping LCD_RS = 26 LCD_E  = 19 LCD_D4 = 13 LCD_D5 = 6 LCD_D6 = 5 LCD_D7 = 11 trig = 4 echo = 18 # Define some device constants LCD_WIDTH = 16    # Maximum characters per line LCD_CHR = True LCD_CMD = False LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line ...

python codings import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) GPIO.setwarnings(False) led = 17 echo = 4 trig = 18 GPIO.setup(echo , GPIO.IN) GPIO.setup(led , GPIO.OUT) GPIO.setup(trig , GPIO.OUT) while 1:     GPIO.output(trig ,True)     time.sleep(0.00001)     GPIO.output(trig ,False)     while GPIO.input(echo) == False:         srt = time.time()     while GPIO.input(echo) == True:         end  = time.time()     duration = end - srt     distance_cm = duration/0.000058     print distance_cm     if distance_cm < 10:         GPIO.output(led , GPIO.HIGH)     else :         GPIO.output(led , GPIO.LOW)     time.sleep(.1) ************************************************************ copy that and upload in your python...

python codings import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) GPIO.setwarnings(False) trig = 4 echo = 18 GPIO.setup(trig , GPIO.OUT) GPIO.setup(echo , GPIO.IN) while 1:     GPIO.output(trig, True)     time.sleep(0.0001)     GPIO.output(trig, False)     while GPIO.input(echo) == False:         srt = time.time()     while GPIO.input(echo) == True:         fsh = time.time()     dif = fsh - srt     #for cm :     dis_cm = dif/0.000058     dis_inch = dif/0.000148     print('distance: {}cm'.format(dis_cm))     time.sleep(.5) ********************************************************************************* copy that and paste in your python idle