Alse read http://www.appinventor.org/bookChapters/chapter16.pdf
from
FAQ Section: Books, Tips, Tutorials for AI2
And do you know then how I should modify my arduino code? I don't separate the letters for anything, I only use the print option for each case
Post the code?
\n is line feed.
if (distancia < lejos)
{
alertas(distancia);
}
else if (distancia > lejos)
{
digitalWrite (led, LOW);
bt.print("d");
delay(400);
}
if (distancia2 < lejos)
{
cuidado(distancia2);
}
else if (distancia2 > lejos)
{
digitalWrite (led, LOW);
delay(400);
bt.print("h");
}
}
void alertas(float distancia) {
if (distancia < lejos && distancia >= medio) {
bt.print("a");
delay(400);
parpadeo(1000);
}
else if (distancia < medio && distancia > cerca) {
bt.print("b");
delay(400);
parpadeo(500);
}
else if (distancia <= cerca) {
bt.print("c");
delay(400);
parpadeo(250);
}
}
void parpadeo(int tiempo) {
digitalWrite(led, HIGH); // enciende el LED.
delay(tiempo); // retardo en milisegundos
digitalWrite(led, LOW); // apaga el LED.
delay(tiempo);
}
void cuidado(float distancia2) {
if (distancia2 < lejos && distancia2 >= medio) {
bt.print("e");
delay(400);
parpadeo2(1000);
}
else if (distancia2 < medio && distancia > cerca) {
bt.print("f");
delay(400);
parpadeo2(500);
}
else if (distancia2 <= cerca) {
bt.print("g");
delay(400);
parpadeo2(250);
}
}
void parpadeo2(int tiempo2) {
digitalWrite(led, HIGH); // enciende el LED.
delay(tiempo2); // retardo en milisegundos
digitalWrite(led, LOW); // apaga el LED.
delay(tiempo2);
}
I see you use print().
If you use println() instead, the codes will are one at a time.
do i have tu use ","?
Ive changed the pirintln, so now i have to add the local variable and try to work with that? 
Export your .aia file and upload it here.
Yes.
A global variable is easier for debugging at this point.
I tried to test the application as it is and it tells me that it does not respond, it does not load, do you know why?
i fix the problem of the doesnt respond but the app still doesn't work, maybe it's my arduino code.
Now the app simply doesn't do anything, it doesn't change the image, it doesn't play sound and nothing
void loop()
{
long distancia = ultrasonic.read();
long distancia2 = ultrasonic2.read();
if (distancia < lejos)
{
alertas(distancia);
}
else if (distancia > lejos)
{
digitalWrite (led, LOW);
bt.println("d");
delay(400);
}
if (distancia2 < lejos)
{
cuidado(distancia2);
}
else if (distancia2 > lejos)
{
digitalWrite (led, LOW);
delay(400);
bt.println("h");
}
}
void alertas(float distancia) {
if (distancia < lejos && distancia >= medio) {
bt.println("a");
delay(400);
parpadeo(1000);
}
else if (distancia < medio && distancia > cerca) {
bt.println("b");
delay(400);
parpadeo(500);
}
else if (distancia <= cerca) {
bt.println("c");
delay(400);
parpadeo(250);
}
}
void parpadeo(int tiempo) {
digitalWrite(led, HIGH); // enciende el LED.
delay(tiempo); // retardo en milisegundos
digitalWrite(led, LOW); // apaga el LED.
delay(tiempo);
}
void cuidado(float distancia2) {
if (distancia2 < lejos && distancia2 >= medio) {
bt.println("e");
delay(400);
parpadeo2(1000);
}
else if (distancia2 < medio && distancia > cerca) {
bt.println("f");
delay(400);
parpadeo2(500);
}
else if (distancia2 <= cerca) {
bt.println("g");
delay(400);
parpadeo2(250);
}
}
void parpadeo2(int tiempo2) {
digitalWrite(led, HIGH); // enciende el LED.
delay(tiempo2); // retardo en milisegundos
digitalWrite(led, LOW); // apaga el LED.
delay(tiempo2);
}
Add a final ELSE to the AI2 if/then/else to display anything that the preceding branches missed in a Label.
Also, is Switch1 On?
I notice you lack branches to handle disconnection.
I dont get it 
yeah switch 1 is on
its a hc05 bt module
Try changing that -1 in the ReceiveText block to +1, to force read single characters.
2 Likes
now works, thanks a loooot
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