App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

sebulox — Mon, 06 Feb 2023 20:07:52 GMT

Hi, 1) Tried the MIT inventor and arduino scripts as suggested. Android app is working fine, Arduino serial correctly receives numbers (each number separated by a "0"), but the led would not turn on. I connected the LED long leg to A3 (then also tried D2 and D13) with a 330 ohm resistor in between, and the short led to GND. I tried the blink script and LED is working ok. Any reasons for that?

2) I wonder whether we could use a dimmer to define led blinking frequency ? I tried to replace the "analogWrite" with "digitalWrite(ledPin, HIGH);delay(value): digitalWrite(ledPin, HIGH); delay(value)"; but LED blinks only once and then stay off.

Thank you for your support; in general I'm looking for options to send numeric values to control arduino via android, for other applications (e.g. water pump timer, etc.).

RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

alexis_cy — Sat, 20 Feb 2016 17:55:06 GMT

its this one

HM-10 BLE Bluetooth 4.0 CC2540 CC2541 Serial Wireless Module

when i press the Bluetooth Devices button i can see only the paired devices

i have test the schematic with another program and works OK with the Arduino

but i want to do my android program to control my led strips

RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

alexis_cy — Sat, 20 Feb 2016 16:28:47 GMT

Hi Neil,

I would like some help with the App Inventor.

I have done the following piece of code and i can not see my Bluetooth module that i connected to my arduino

My Bluetooth module is the CC41-A

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RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

neilk — Sun, 22 Nov 2015 13:09:52 GMT

Ola manoelrfilho

Google translate gives you question as :

Hello Neil.

I would like to know more about your work with the slider app inventor and the ethernet shield.

Obreigado.

Se você me der alguns dias, vou tentar postar algo sobre o uso de controles deslizantes através da internet - usando o escudo Arduino Ethernet.

Espero que isso faz sentido - eu usei o Google Translate. No entanto, o meu post será em Inglês.

Neil

RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

Former Member — Sun, 22 Nov 2015 12:24:18 GMT

Olá Neil.

Gostaria de saber um pouco mais sobre o seu trabalho com o slider do app inventor e o ethernet shield.

Obreigado

RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

neilk — Tue, 18 Aug 2015 21:51:56 GMT

Hi John

is not an issue but interesting to know what I have done / not done in the sketch for this to happen

Even though the Android app is sending the string "a/" followed by a 1 byte number number, say, 64, it is read by the Arduino as a string of 3 characters and then printed as a string of 3 characters, so you get "a/@", instead of a/64

Executing the line value = myString[2] where value is an integer, results in value taking the ASCII value of the character:

If the ASCII value is less then 32 (32 is a space) then the characters are "non-printing" & you get various things appearing

Hope this helps

Neil

RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

alacosta — Tue, 18 Aug 2015 16:21:18 GMT

Hi Neil,

pleased to say all systems are working well ...thank you for your guidance.

Have a mystery .. you will see from the attached serial read, the output is converting the Decimal Value to the ascii symbol and being printed after the

a/ or b/

a/- Settings = 30

a/% Settings = 37

a/3 Settings = 51

a/@ Settings = 64

a/K Settings = 75

a/N Settings = 78

a/. Settings = 46

a/+ Settings = 43

b/ Settings = 26

a/D Settings = 68

b/< Settings =

here is the Arduino Sketch basically yours with slight amendments .....

int ledPin = 3;
int ledPin1 = 6;

    int colour = -1;
    int value = -1;
    String (myString);

void setup()
{

    pinMode(ledPin, OUTPUT);
    pinMode(ledPin1, OUTPUT);

    Serial.begin(9600);
}
void loop()

{

    while ( Serial.available() )            // Read while there are available characters
{
   delay(30);
char c = Serial.read();   // build the data string
myString += c;
}

if ( myString.length() > 0 )            //If we have a data string

{
Serial.print(myString); // Output the full data string

Serial.print(" Settings = ");
colour = myString[0];
value = myString[2];
Serial.println(value);
if ( colour == 'a')
{
    analogWrite( ledPin, value );
}
else
    if ( colour == 'b' )
{
analogWrite( ledPin1, value );
}
   myString = "";

    }
}

is not an issue but interesting to know what I have done / not done in the sketch for this to happen

John

RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

alacosta — Wed, 12 Aug 2015 12:12:15 GMT

Hi Neil

as a follow on to previous query, worked on your slider blog (3 ) all worked but I need to control 3 sliders to control in Arduino.

have tried extending your initial guide but failing ... basic help / guidance be appreciated. Iread in your blog about 3 slider control for a RGB led but could not locate.

problem with this set up trying to control 2 led's but no matter which lider I move just controls one LED !

enclosed following mit api2 blocks and Arduino basic sketch

John

int ledPin = 3;
int ledPin1 = 5;
// Needs to be a pin supporting PWM

int value = -1;
int value1 = -1;

void setup()

{

Serial.begin(9600);

pinMode(ledPin, OUTPUT);
pinMode(ledPin1, OUTPUT);
}
void loop()
{

while (Serial.available()) // Read while there is data in the buffer

{
value = Serial.read();
   if (value >= 0)    //If we have meaningful data
{
     Serial.println(value);     // Debug - double check it make sense?
     analogWrite(ledPin,value); // set PWM for LED brightness
     value = -1;
    }
   }

while(Serial.available())   // Read while there is data in the buffer

{
value1 = Serial.read();
   if (value1 >= 0)    //If we have meaningful data
{
     Serial.println(value1);     // Debug - double check it make sense?
     analogWrite(ledPin,value1); // set PWM for LED brightness
     value1 = -1;
    }
}
}

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RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

Former Member — Mon, 16 Mar 2015 11:00:16 GMT

Hi Neil,

I try to rebuild the app from your example.

Unfortunately I can't see the pictures anymore... I'm getting below 404 error when clicking them.

404. That’s an error.

The requested URL/llQW0xW0a8SnIMsVzpuFV0gd9Za6P2Ubij8cIulQR6CtqIb62gOmlvKiBJKdmS8UPBrSHrG388u5_0x9Gx93XmozusYAUO9gN4XFveNipn5ZiuNrqI6COjPooxh_6nrmzQwas not found on this server. That’s all we know.

Do you have them maybe on another page or can you provide them via email ?

Thank you very much

Regards

Roger

RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

Former Member — Thu, 01 Jan 2015 16:39:36 GMT

Hi Mr Neil. I'm Sam from philippines, i am a student, i just want to ask if you could teach me how to control LED brightness through Android Seekbar with Arduino Ethernet shield. i just want to know the concept on how the values of seekbar is being sent from the app and received by the arduino. please let me know if you can teach me. please email me sir. Thanks!.

Sam

samfinch14@gmail.com

RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

sswcharlie — Thu, 11 Dec 2014 02:20:45 GMT

Hi Neil

Should have posted this before. Its called old age.

With the slider in AppInvent2 is there a vertical option and also different designs?

Thanks

CharlesHarris

RE: App Inventor, Bluetooth and Arduino Part 3; Android Slider controls LED brightness

sswcharlie — Thu, 11 Dec 2014 00:59:16 GMT

Charles Harris here from New Zealand. Would like to contact Neil re use of the slider. Cannot find private mail link.

Charles

swchuck( at) gmail.com