Bonjour, je souhaite afficher un texte ou effectuer une action en fonction des données reçues par Bluetooth (HC-05)
Je recois bien les données, mais ne parviens pas a effectuer une condition : si reçu "0" afficher "word1" si reçu "1" afficher "word2" etc ..
Before taking a screenshot please switch the Language to English
Alternatively wait until someone french speaking can help you
Taifun
Be sure to use println() at the end of each message to send from the sending device, to signal end of message.
Only use print() in the middle of a message.
Be sure not to println() in the middle of a message, or you will break it into two short messages and mess up the item count after you split the message in AI2.
Do not rely on timing for this, which is unreliable.
In the AI2 Designer, set the Delimiter attribute of the BlueTooth Client component to 10 to recognize the End of Line character.
Also, return data is not immediately available after sending a request,
you have to start a Clock Timer repeating and watch for its arrival in the Clock Timer event. The repeat rate of the Clock Timer should be faster than the transmission rate in the sending device, to not flood the AI2 buffers.
In your Clock Timer, you should check
Is the BlueTooth Client still Connected?
Is Bytes Available > 0?
IF Bytes Available > 0 THEN
set message var to BT.ReceiveText(-1)
This takes advantage of a special case in the ReceiveText block:
ReceiveText(numberOfBytes)
Receive text from the connected Bluetooth device. If numberOfBytes is less than 0, read until a delimiter byte value is received.
If you are sending multiple data values per message separated by | or comma, have your message split into a local or global variable for inspection before trying to select list items from it. Test if (length of list(split list result) >= expected list length) before doing any select list item operations, to avoid taking a long walk on a short pier. This bulletproofing is necessary in case your sending device sneaks in some commentary messages with the data values.
Some people send temperature and humidity in separate messages with distinctive prefixes like "t:" (for temperature) and "h:" (for humidity).
(That's YAML format.)
The AI2 Charts component can recognize these and graph them. See Bluetooth Client Polling Rate - #12 by ABG
To receive YAML format messages, test if the incoming message contains ':' . If true, split it at ':' into a list variable, and find the prefix in item 1 and the value in item 2.
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Thanks for your feedback, I checked, all the settings are ok. I am receiving the text data from the HC-05, however; when I create a condition with the received text, it does not work.
Try to send only one character
M for mouvement or C for calme
You also might want to display in a label what you received
Taifun
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Most probably because you are receiving also the invisible new line character \n
Try to compare only the first character of the string you received. . There is a segment block for this in the text drawer
Or use the contains block
If contains global message
M
Then
Taifun
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It's all in the eyes:
I corrected the code but it doesn't change anything.
How will your code react if more than one M\n piles up in the incoming Bluetooth buffer?
trim(M\nM\n) won't equal 'M'.
its ok , my code on arduino send only one M\n at time
Is there a way to make the app continue to work even if the screen is off or the program is in the background? Itoo ?
In your Script/Sketch you have:
If (!mouvementDetecte) {
mouvementDetecte = true;
Serial.println(" Mouvement detecte !");
BT.println("M");
digitalWrite(LED_PIN,HIGH);
//...etc
That is saying "if there is no movement, there is movement"
Try this:
If (mouvementDetecte) {
Serial.println(" Mouvement detecte !");
BT.print("M");
BT.println();
digitalWrite(LED_PIN,HIGH);
//...etc
Think of "BytesAvailableToReceive" as a flag - it does not necessarily match the number of bytes actually sent. Instead, use this code to be sure:
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I modified my code
// ----- Détection de mouvement (PIR) -----
int motionDetected = digitalRead(PIR_PIN);
// Début d'une détection
if (motionDetected == HIGH && !motionActive) {
digitalWrite(LED_PIN, HIGH);
tone(SPEAKER_PIN, 1000); // Son à 1 kHz
Serial.println("⚠️ Mouvement détecté !");
BT.println("M");
motionActive = true;
motionStartTime = currentTime; // Démarrage du timer d'alerte
}
Yes, just give it a try
Read the first post about how to use itoo
Taifun
1 Like