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Hi Gordon,

first of all thank you very much for the information, I didn´t know that.

I have two more questions about this. If I delete this lines:

  if (avrX > 90){
       uart.write("\x03\x10digitalWrite(LED1, 0), digitalWrite(D31, 0);\n");}
       if (avrX < 105){
       uart.write("\x03\x10digitalWrite(LED1, 0),digitalWrite(D27, 0);\n");}
       if (avrY > 90){
       uart.write("\x03\x10digitalWrite(LED1, 0),digitalWrite(D28, 0);\n");}
       if (avrY < 105){
       uart.write("\x03\x10digitalWrite(LED1, 0),digitalWrite(D29, 0);\n");}

I don´t get any feedback in the console. If I let it in, I get this message, even if it works with the connecting/disconnecting thing:

Uncaught Error: Unhandled promise rejection: Error: BLE task CHAR_WR is already in progress

The other thing is I try to implement now the button and the part of the code for the button works in another program and also if the Accel is not in that one. What is the issue, when I want to use that additional code? Is it that uart.write is busy in some way? Sometimes the signal from the button receives the MDBT but after 2 or 3 times it stops or the LED on the MDBT does not go off again.

Here the complete Code:

var log = print;
var uart;
var l;
var connected = false;
var avrX = 0;
var avrY = 0;
var accZero = Puck.accel().acc; // get the base value when we start up

///BLE Connect


    function flag(e) {

    var l = e.time-e.lastTime;
    if ((l < 0.3) && (connected == false)){
    log("Sending command");
    log("Searching for device...");
    NRF.requestDevice({ filters: [{ namePrefix: 'MDBT42Q' }]
    }).then(function(device) {
    log("Connecting...");
    device.on('gattserverdisconnected', function() {
    uart = undefined;
    connected = false;
    });
    return require("ble_uart").connect(device);
    }).then(function(u) {
    log("Connected");
    digitalPulse(LED3, 1, 300);
    uart = u;
    connected = true;
    log (connected);
    });}

    if ((l < 0.3) && (connected == true)){

    if (uart) uart.disconnect();
    uart = undefined;
    connected = false;
    log (connected);

    }


    }
    setWatch(flag, BTN, {repeat:true, edge:"falling"});




///Accelerometer



Puck.accelOn();


Puck.on('accel', function(data) {


  avrX = (avrX*0,99) + 0.01*(data.acc.x - accZero.x);
  avrY = (avrY*0,99) + 0.01*(data.acc.y - accZero.y);
///log (avrX, avrY);

 if (connected == true) {

       if (avrX < 90){
       uart.write("\x03\x10digitalWrite(LED1, 1), digitalWrite(D31, 1);\n");}
       if (avrX > 105){
       uart.write("\x03\x10digitalWrite(LED1, 1),digitalWrite(D27, 1);\n");}
       if (avrY < 90){
       uart.write("\x03\x10digitalWrite(LED1, 1),digitalWrite(D28, 1);\n");}
       if (avrY > 105){
       uart.write("\x03\x10digitalWrite(LED1, 1),digitalWrite(D29, 1);\n");}

       if (avrX > 90){
       uart.write("\x03\x10digitalWrite(LED1, 0), digitalWrite(D31, 0);\n");}
       if (avrX < 105){
       uart.write("\x03\x10digitalWrite(LED1, 0),digitalWrite(D27, 0);\n");}
       if (avrY > 90){
       uart.write("\x03\x10digitalWrite(LED1, 0),digitalWrite(D28, 0);\n");}
       if (avrY < 105){
       uart.write("\x03\x10digitalWrite(LED1, 0),digitalWrite(D29, 0);\n");}

 }

});







     setWatch(function(c) {

       
       
     if (connected == true) {

       
     setTimeout(function () {
     {
     uart.write("\x03\x10digitalWrite(LED2,1), digitalWrite(D30, 1);\n");
     }

     }, 400);
     }

     }, BTN, { repeat: true, edge: 'rising' });




     setWatch(function(c) {
 
 
     if (connected == true) {
       
     {
     uart.write("\x03\x10digitalWrite(LED2,0), digitalWrite(D30, 0);\n");
        } 
     }
     
      }, BTN, { repeat: true, edge: 'falling' });

Ah and one more info, the re-connection works basically but the signals will not be sent to the MDBT42Q. The LED there is not reacting anymore after the reconnection.

I get this message now in the console with BLE task 3:

0
false
Uncaught Error: Unhandled promise rejection: Error: BLE task 3 is already in progress
Sending command
Searching for device...
Connecting...
Connected
1
true

Hi Gordon,

thanks for that help.

What I found out is, if I delete the part with the accelerometer it works. I can connect and disconnect like it should be all the time.

Did I made a mistake in the accelerometer section? I ask for
if connection is true, uart.write.

var log = print;
var status = 0;
var uart;
var l;
var connected = false;
var avrX = 0;
var avrY = 0;
var accZero = Puck.accel().acc; // get the base value when we start up


//BLE Connect

    function flag(e) {
  
    var l = e.time-e.lastTime;  
    if ((l < 0.3) && (connected == false)){
    log("Sending command");
    log("Searching for device...");
    NRF.requestDevice({ filters: [{ namePrefix: 'MDBT42Q' }]         }).then(function(device) {
    log("Connecting...");
    device.on('gattserverdisconnected', function() {
    uart = undefined;
    connected = false;
    });
    return require("ble_uart").connect(device);
    }).then(function(u) {
    log("Connected");
    digitalPulse(LED3, 1, 300);
    uart = u;
    connected = true;
    status = 1;
    log (status);
    log (connected);
    });}


    if ((l < 0.3) && (status == 1)){ 
      
    if (uart) uart.disconnect();
    uart = undefined;
    connected = false;
    status = 0;
    log (status);
    log (connected);
    }

    
      
    }
    setWatch(flag, BTN, {repeat:true, edge:"falling"});




///Accelerometer



Puck.accelOn();


Puck.on('accel', function(data) {
  

  avrX = (avrX*0,99) + 0.01*(data.acc.x - accZero.x);
  avrY = (avrY*0,99) + 0.01*(data.acc.y - accZero.y);
///log (avrX, avrY);

 if (status == 1) {

       if (avrX < 90){
       uart.write("digitalWrite(LED1, 1), digitalWrite(D31, 1);\n");}
       if (avrX > 105){
       uart.write("digitalWrite(LED1, 1),digitalWrite(D27, 1);\n");}
       if (avrY < 90){
       uart.write("digitalWrite(LED1, 1),digitalWrite(D28, 1);\n");}
       if (avrY > 105){
       uart.write("digitalWrite(LED1, 1),digitalWrite(D29, 1);\n");}

       if (avrX > 90){
       uart.write("digitalWrite(LED1, 0), digitalWrite(D31, 0);\n");}
       if (avrX < 105){
       uart.write("digitalWrite(LED1, 0),digitalWrite(D27, 0);\n");}
       if (avrY > 90){
       uart.write("digitalWrite(LED1, 0),digitalWrite(D28, 0);\n");}
       if (avrY < 105){
       uart.write("digitalWrite(LED1, 0),digitalWrite(D29, 0);\n");}

  }
      
  

});

I have a little problem that I'm stuck on.

What I basically want to do is:

1. with a short press of the Puck.js <0,3s a Bluetooth connection to the MDBT42Q should be established >>> works.
   
2. directly after the connection, the accelerometer should execute its function and switch various pins on the MDBT when the threshold values are exceeded >>> works
   
3. when pressing the Puck.js again < 0,3s the Bluetooth connection shall be disconnected again.
   
   

When I upload the code it either doesn't work at all or once and then not anymore.

I get following in the Console:

Uncaught Error: Unhandled promise rejection: Error: BLE task 6 is already in progress
Uncaught Error: Unhandled promise rejection: Error: BLE task 6 is already in progress
Uncaught Error: Unhandled promise rejection: Error: BLE task 6 is already in progress
Uncaught Error: Unhandled promise rejection: Error: BLE task 6 is already in progress
Uncaught Error: Unhandled promise rejection: Error: BLE task 6 is already in progress
Uncaught Error: BLE task 6 is already in progress
 at line 1 col 14
k.disconnect()
             ^
in function "disconnect" called from line 1 col 17
uart.disconnect();
                ^
in function called from system
Uncaught Error: Unhandled promise rejection: Not connected
Uncaught Error: Unhandled promise rejection: Not connected
Uncaught Error: Unhandled promise rejection: Not connected
Uncaught Error: Unhandled promise rejection: Not connected
Uncaught Error: Unhandled promise rejection: Not connected
Uncaught Error: Unhandled promise rejection: Not connected
Uncaught Error: Unhandled promise rejection: Not connected
Uncaught Error: Unhandled promise rejection: Not connecte

Here the code:

var log = print;
var uart;
var l;
var connected = false;
var avrX = 0;
var avrY = 0;
var accZero = Puck.accel().acc; // get the base value when we start up



//BLE Connect

    function flag(e) {
  
    var l = e.time-e.lastTime;  
    if ((l < 0.3) && (connected == false)){
    log("Sending command");
    log("Searching for device...");
    NRF.requestDevice({ filters: [{ namePrefix: 'MDBT42Q' }]         }).then(function(device) {
    log("Connecting...");
    device.on('gattserverdisconnected', function() {
    });
    return require("ble_uart").connect(device);
    }).then(function(u) {
    log("Connected");
    digitalPulse(LED3, 1, 300);
    uart = u;
    connected = true;
    });}

      
    if ((e.time - e.lastTime < 0.3) && (connected == true) ){
    setTimeout(function(device) {
    uart.disconnect();
    log("Disconnected");
    connected = false;
    }, 1000);}


    }
    setWatch(flag, BTN, {repeat:true, edge:"falling"});




///Accelerometer


    Puck.accelOn();

Puck.on('accel', function(data) {
  avrX = (avrX*0,99) + 0.01*(data.acc.x - accZero.x);
  avrY = (avrY*0,99) + 0.01*(data.acc.y - accZero.y);
///log (avrX, avrY);

   if (connected == true) {

       if (avrX < 90){
       uart.write("digitalWrite(LED1, 1), digitalWrite(D31, 1);\n");}
       if (avrX > 105){
       uart.write("digitalWrite(LED1, 1),digitalWrite(D27, 1);\n");}
       if (avrY < 90){
       uart.write("digitalWrite(LED1, 1),digitalWrite(D28, 1);\n");}
       if (avrY > 105){
       uart.write("digitalWrite(LED1, 1),digitalWrite(D29, 1);\n");}

       if (avrX > 90 && avrX < 105 && avrY > 90 && avrY < 105){
       uart.write("digitalWrite(LED1, 0),digitalWrite(D31, 0), digitalWrite(D27, 0), digitalWrite(D28, 0),                digitalWrite(D29, 0) ;\n");}
   }


});

Did I understand this correctly? The characteristic 039afff8-2c94-11e3-9e06-0002a5d5c51b stands for the transmission of the signal status, power spectrum and eSense (attention/meditation) but it is not sent publicly? So, one will not receive anything or see the received content?

Awesome, thank you Gordon!

But I have another question.

Any idea how I can get x/y starting at 0 with a non sensitive movement tracking?
The raw values changing very fast.

I would like to use the Puck.js as a Joystick.

Best regards

Puck.accelOn();

Puck.on('accel', function(data) {
  console.log(data.acc.x);
});

Got it.

Hi,

I saw the documentation about the built in accelerometer/gyroscope.
How I can return only the x/y values of the accelermoter, starting at 0?

Best regards

Is it possible to set different intervals?

I have two operations using setInterval().
One is to read out a sensor via I²C and on the other hand I would like to let a LED blink, depents on the counter value, e. g. counter == 3 >>> LED should blink 3 times all 10 seconds.

My problem is that the LED blinks continiously - I tried it with arguments but it does not work.

///Sensor_Data        
     setInterval(() => {
     i2c.writeTo(0x18, 0xAA, 0x00, 0x00); 
     setTimeout(() => {
     let output = i2c.readFrom(0x18, 5);
     var output_bit = output[1] *100 *100 + output[2]*100 + output[3];    
     var pressure1 = (output_bit-1200000)*(1-(-1));
     var pressure2 = pressure1/(1500000-1200000);
     var pressure_final = pressure2 + (-1) - 0.29;    
     log(pressure_final, counter);  
///Counter    
     if (pressure_final < -0.2) {
     status_counter = 1;
     }
     if ((status_counter == 1) && (pressure_final > -0.2) && (pressure_final < 0.2)) {
     counter = counter + 1;            
       if (counter + 1) {
       status_counter = 0;}
       }
         if (counter > 6){
         counter = 1;
         }

And finally the code with the psi-output value:

var i2c = new I2C();
i2c.setup({ scl : D29, sda: D28 });
var output_bit;
var output_max;
var output_min;
var P_max = 1;
var P_min = -1;
var pressure1;
var pressure2;
var pressure_final;
setInterval(() => {
i2c.writeTo(0x18, 0xAA, 0x00, 0x00);
  setTimeout(() => {
  let output = i2c.readFrom(0x18, 5);
    var output_bit = output[1] *100 *100 + output[2]*100 + output[3];
    console.log(output_bit);
    var pressure1 = (output_bit-1200000)*(1-(-1));
    var pressure2 = pressure1/(1500000-1200000);
    var pressure_final = pressure2 + (-1) - 0.4;   
    console.log(pressure_final);
  }, 100);
}, 300);

Hi Robin,

also thanks for your answer.

Now with this code works to get a realtime 24-bit value without re-upload:

    var i2c = new I2C();
    i2c.setup({ scl : D29, sda: D28 });
    setInterval(() => {
      i2c.writeTo(0x18, 0xAA, 0x00, 0x00);
      setTimeout(() => {
        let a = i2c.readFrom(MPRL, 5);
        console.log(a);
      }, 100);
    }, 300);

Now I try to calculate the pressure like in the description of the datasheet and the arduino library.
Its strange I just played with the new code and the times of the timeout and interval function.

Then i get the values ([96, 0, 0, 0, 0]) in the console.

Hi Jean-Philippe,

thanks for the fast feedback, that helps!

But why the data in the console just change when I upload the code again? When i make a sip or puff activity, nothing will change.

Hi,

can someone help me to get the sensor data of the MPRL sensor?

I wrote some code by using the documentation of the sensor manufacturer:

Find datasheet here:
https://sps.honeywell.com/us/en/products/sensing-and-iot/sensors/pressure-sensors/board-mount-pressure-sensors/micropressure-mpr-series

var i2c = new I2C();
i2c.setup({ scl : D29, sda: D28 });     
i2c.writeTo(0xAA, 0x00, 0x00); 
setInterval(function () {
var x = i2c.readFrom(0x18, 5);  
console.log(x);
}, 200);

What I get in the console :
new Uint8Array([64, 139, 169, 98, 128])

When I reupload the code and give a puff signal to the connected tube on the sensor the value 139 increase. When I do a sip in goes down. The other values 3 & 4 change randomly. the first and the last value is steady.

The value 139 changes just when I reupload to the MDBT42Q module. What I need to do that the value is changing in realtime? Do I need to convert the value as well?

Greetings

I've asked about it, but I'm still waiting to hear back.

You can read the hex addresses from the documentation.

Do you think I could try it via a module?
The combination of Bluetooth connection and readout should also work with a module.

However, I have not really understood how this works with the modules on a local storage location. I know your documentation but don't know how it is meant to put the module in when you have created a new empty folder via Settings >>> Projects.

Hi Gordon,

so I just get zeros as values. I tried it with the hex code 0x04 (attention level).
In the documentation in the link below I saw there are also a hex code to enable the outputs but I don´t konw how to integrate that into the espruino program.

I added var buf = 0x04 in the code.

Found this documentation on the thinkgear website with the codes:
http://developer.neurosky.com/docs/doku.php?id=thinkgear_communications_protocol#data_payload

var buf = 0x04 ;
var gatt,characteristic;
setWatch(function(e) {
NRF.requestDevice({ filters: [{ adress: 'c4:64:e3:e8:d6:e9' }] }).then(function(device) {
  console.log("Found");
  return device.gatt.connect();
}).then(function(g) {
  console.log("Connected");
  gatt = g;
  return gatt.getPrimaryService(
    "039afff0-2c94-11e3-9e06-0002a5d5c51b");
}).then(function(service) {
  return service.getCharacteristic(
    "039afff8-2c94-11e3-9e06-0002a5d5c51b");
}).then(function (c) {
  console.log("Got Characteristic");
  characteristic = c;
  characteristic.on('characteristicvaluechanged', function(event) {
     processBrainData(event.target.value.buffer);
  });
  return characteristic.startNotifications();
}).then(function() {
  console.log("Connected.");
  enableOutput(buf1);
});
      }, BTN, { repeat: true, edge: 'rising' });
function processBrainData(buf) {
  var d = new Uint8Array(16);
  setInterval(function() {
  print(d.slice().map(x=>x.toString(16).padStart(2,0)).join(" "));
}, 500);
  }

So the connection works but I don´t get any data.
Thats all what I get:

Found
Connected
Got Characteristic
Connected.

Hey, sure I will try it.

Yes, please find here the link, its Post#5 in the forum:

https://forum.arduino.cc/index.php?topic=695579.0

Hi Gordon,

thanks for your answer.

I have been able to establish a Bluetooth connection with the device. Found a service and characteristics UUID in an Arduino forum.

However, how I should read the data now (with what code), I'm stumped. Had tried it with the combination of the module suggested by you and about the known to me BLE connection setup in the WEB IDE.

var gatt,characteristic;
NRF.requestDevice({ filters: [{ adress: 'c4:64:e3:e8:d6:e9' }] }).then(function(device) {
  console.log("Found");
  return device.gatt.connect();
}).then(function(g) {
  console.log("Connected");
  gatt = g;
  return gatt.getPrimaryService(
    "039afff0-2c94-11e3-9e06-0002a5d5c51b");
}).then(function(service) {
  return service.getCharacteristic(
    "039afff8-2c94-11e3-9e06-0002a5d5c51b");
}).then(function (c) {
  console.log("Got Characteristic");
  characteristic = c;
  startReading();
});
function startReading() {
  var busy = false;
  var i = setInterval(function() {
    if (!gatt.connected) {
      clearInterval(i);
      return;
    }
    if (busy) return;
    busy = true;
    function processBrainData(data) {
     console.log(data.field, data.value);
   }   brain.on('data', processBrainData);
  }, 50);
}

Is there a possibility to install the module onto MDBT42Q.
I tried it via github and from a local folder but had no success.

Its my first time, working with modules on espruino.

I see thats the module which is integrated in the headset.

Hi Gordon,

thanks. So without that module do you think its not possible to get a bluetooth connection + reading out data from the NeuroSky Headset directly on a MDBT42Q or Puck?

Greetings

Are someone still working with brainwaves and Espruino? I have a Neurosky Mindwave Mobile 2 Headset and would like to read the meditation and attention data.

Can someone help?