Bluetooth Proximity Sensor

[Konrad Walsh]

@hek
Did you get anywhere with this? I am trying in vain.. the issue I see is that the BT module and the RF module are both serial outputs/inputs..
struggling to get off the ground on this

[hek]

I accidentally feed the first module with reversed polarity. It did not like that very much. :(

The second module arrived this week, but I haven't hooked it up yet. Planned on using software serial and had a test sketch going something like this:

/* $Id$

Serial terminal for the HC-05 bluetooth module.
Sets up BT module and allow user interaction with the device via the Arduino Serial Monitor.

Wiring of BT HC-05 device to the Arduino
RX -> 11
TX -> 10
KEY -> 9
*/

#include <SoftwareSerial.h>

// Bluetooth to Arduino pins.
#define BTkey 9
#define BTrxPin 10
#define BTtxPin 11

enum { SYNC, ASYNC };

SoftwareSerial BTSerial(BTrxPin, BTtxPin);

// Send a command to the bluetooth device.
// mode ASYNC - don't want for the response
// mode SYNC - wait for the response
void sendBluetoothCommand(String cmd, uint8_t mode) {
  Serial.print(mode == SYNC ? "SYNC> " : "ASYNC> ");
  Serial.println(cmd);

  BTSerial.println(cmd);
  if (mode == ASYNC) return;
  
  char ch = 0;
  while (ch != '\n') {
    if (BTSerial.available()) {
      ch = BTSerial.read();
       Serial.write(ch);
    }
  }
}

void setup()
{
   Serial.begin(57600);
   
  /////////////////////////////////////////////////////////
  // SETUP BLUETOOTH  
  // define pin modes for tx, rx:
  pinMode(BTrxPin, INPUT);
  pinMode(BTtxPin, OUTPUT);
  // Switch module to AT mode
  pinMode(BTkey, OUTPUT);
  digitalWrite(BTkey, HIGH);  
  BTSerial.begin(38400);
  sendBluetoothCommand("AT", SYNC);
  sendBluetoothCommand("AT+NAME=blueNode", SYNC);
  // AT+ROLE=p1
  // p1 - 0 Slave Role, 1 Master Role, 2 Slave-Loop role.
  sendBluetoothCommand("AT+ROLE=1", SYNC);
  // AT+INQM=p1,p2,p3
  // p1 - 0 inquire_mode_standad, 1 inquire_mode_rssi
  // p2 - maximum number of bluetooth devices response
  // p3 - the maximum of limited inquiring time. 1~48 (1.28s ~ 61.44s)
  //      15*1.28 = 19sec 
  sendBluetoothCommand("AT+INQM=0,5,15", SYNC);
}

void loop()
{
  // Keep reading from HC-05 and send to Arduino Serial Monitor
  if (BTSerial.available())
    Serial.write(BTSerial.read());

  // Keep reading from Arduino Serial Monitor and send to HC-05
  if (Serial.available())
    BTSerial.write(Serial.read());
}

And.. the first module was of the wrong type (I think). Must support master-mode if I understand it correctly. The second one I bought was this type.

[Konrad Walsh]

@hek
Thanks - Sorry to hear you killed it.. Its why I alway buy two of everything.. one to kill/learn and one to use :)

I have the HC-06
I noticed you are using the KEY connection... I didn't connect that at all... I will give your code a whirl

[hek]

I think KEY must be used to access the AT-commands.

[Konrad Walsh]

ah. that would explain why I cant get the module to return is device info

[NotYetRated]

I think something similar can be achieved with Tasker(android) and wifi.

Tasker detects when it connects to your home network, initiates command telling Vera "Honey, I'm Home!". My home WiFi is much more robust/extensive than any blutooth connection radius would be.

Thoughts?

[hek]

@NotYetRated

Probably easier but not as fun :)

[NotYetRated]

@hek haha ohh no denying that :)

The blutooth sensor could definitely come in useful for any number of situations, so it would definitely be good to have! I just think, specifically for "getting home" detection, WiFi may be more robust. Then again, so long as this sensor is placed at entrance to the driveway, or in the garage, distance should be a non-issue. :)

[Zeph]

The main advantage of BlueTooth would be its shorter range - if you have multiple of them and wanted to detect roughly where the phone was - especially if the modules had RSSI.

[NotYetRated]

@Zeph Ahh, shorter range as a benefit, guess I had not considered it like that!

[Konrad Walsh]

@NotYetRated On one side I agree as this is what I have done for the passed few years
The problem is, this is unreliable..
but this along with that will make a more robust system..

See imagine.. I have one at each door...

I know when I am in the sitting vs the kitchen vs the bedroom..

now my squeezelite music system follows me.. the lights follow me... and more..- EG - click vol up on my phone adjusts the volume in that room alone....

[Konrad Walsh]

@hek
I have to wait for you to figure this one out... I have tried many methods but not making progress at all...

Your code does work by the way.. It sends and receives the data without issue.. but getting it all repackaged for a MySensors plugin isn't happening for me..

I have taken the binary switch recipe and I am using that so that it will turn on on/off based on the BT id it sees ..

I might start a fresh tonight.. Ill post any updates if I make progress on it..

[hek]

I was thinking of just emulating a door-sensor. When BT detects someone in proximity it sends 1 and 0 when no-one is in range. Just like the binary switch you proposed..

If you want to send in which device in range you could use VAR1-5 with the BT device identifier as payload (at some interval).

[Konrad Walsh]

I have given up.. I cant get anywhere with this but I think its cause I bought hc-06.. Are you closer?

[hek]

Last time I tested with the new HC-05 I couldn't get it to enter AT mode. Will probably make another test when I have some time.

[Konrad Walsh]

ok.. mine enters AT mode.. and I can get it to send and receive data.. I may as well keep plugging at it so

[PedroC88]

@Konrad-Walsh For what I know, the HC-06 is automatically configured to take in AT commands, so that shouldn't be a problem, although mine (that I got today) seems to be defective as I send it the AT command, but I'm getting no answer.

[PedroC88]

@hek When you say you inverted the polarity... are you talking about VCC and GRD? or Rx and TX?

[hek]

@PedroC88

vcc/gnd

[Konrad Walsh]

i am "semi" abandoned it.. I couldn't get it work at all...