ad8232+mit app invertor+ecg+bluetooth hc06

Bahattin Gok

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May 1, 2019, 7:56:52 AM5/1/19

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'Hi, I am trying to project like that. Firstly I made my ECg circuit with istrumentation amplifers, and filter etc.Finally I could clearly ECG signals from Oscilloscope.After that my first work was tried to analog signal data to send with bluetooth and monitoring android telephone. I used app at MIT App Invertor and analog signal was from potantiometer voltage data. And ı obtained plotter app everything was okey. After that I camed to ECG signal sending level. But ECG datas does not seem. After that I try to AD8232 . And happened same thing, I did not see anything graphic anything. And my project is sttoping now. Could you help me abaout sendind data which is used bluetooth connection to android app? Thank you.

Ghica

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May 1, 2019, 8:33:31 AM5/1/19

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Could you post your relevant blocks here and a sample of the data you send to your app?

Cheers, Ghica.

TimAI2

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May 1, 2019, 8:34:56 AM5/1/19

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Have you searched the forum and FAQ for information on connecting your phone / app with bluetooth / arduino / AD8232 / HC06 ?

Plenty here...

If this doesn't help to resolve things then you will need to provide more information:

Sketches / ino files

Blocks images

Project file

Others may not have your hardware it is therefore often difficult to test recomendations

Bahattin Gok

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May 1, 2019, 10:13:12 AM5/1/19

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I made app by youtube video and, after I use this app. I made too but I think I remove it because I cant find so I upload these app. My arduino code and app files here this link. Thank you.

Link is here.

Ghica

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May 1, 2019, 10:43:10 AM5/1/19

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If you want further help, we need an .aia and delete that .apk!

Cheers, Ghica.

Bahattin Gok

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May 1, 2019, 10:56:13 AM5/1/19

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Okey, I am sending ASAP

Bahattin Gok

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May 1, 2019, 11:41:02 AM5/1/19

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Okey I dont know my link work or not. Here you are. I am using this app.

Link is here

And its image(ss) is here. Thank you.

http://ai2.appinventor.mit.edu/?locale=en#6322817839267840

ABG

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May 1, 2019, 1:53:49 PM5/1/19

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Here's your sketch, to save trouble for the other reviewers ...

#include <SoftwareSerial.h>

SoftwareSerial btSerial(2, 3); // RX, TX

int in = A0;

void setup() {
// put your setup code here, to run once:
Serial.begin(38400);
btSerial.begin(38400);

pinMode(in, INPUT);
pinMode(10, INPUT); // Setup for leads off detection LO +
pinMode(11, INPUT); // Setup for leads off detection LO -
}

void loop() {
// put your main code here, to run repeatedly:

if ((digitalRead(10) == 1) || (digitalRead(11) == 1)) {
Serial.println('!');
}
else {

float val = analogRead(in);
Serial.println(val);

}
//Wait for a bit to keep serial data from saturating
delayMicroseconds(1000);

}

I marked the important parts in bold.

The default connection speed is usually 9600 bps.

Will this fast 4x speed connect okay? Maybe.

You do a println('!') but don't check in AI2 for that in your plotting math.

You do a println() of a float value, but do a readBytes in AI2.

AI2 does not know to assemble and decode the println text back into a number.

Instead, use an AI2 BT delimiter of 10 (line feed) and BT read text to get complete transmissions of the text form of the number:

Use println() to separate messages when you transmit.

Set Delimiter = 10 in BlueTooth Designer.

Check for Bytes Available > 0 in blocks,

but then request -1 bytes to get only full messages.

See https://groups.google.com/forum/#!msg/mitappinventortest/lVaCyAeWm_4/ADjvy05wAwAJ attachments.

Your sending delay is 1000 microseconds = 1 millisecond.

AI2 can't process that quickly.

AI2 must read twice as often as your hardware sends, to avoid choking.

Adjust your Clock.Timer accordingly (20 ms?) and your .ino delay() longer (30000 uS = 30 ms?)