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albireo13
05-10-2013, 12:40 PM
I just ordered the Teensy 2.0 to use for reading two rotary encoders. I want to be able to communicate to a Android tablet
using Bluetooth. I'm thinking that I can get by with a low cost (< $15) Bluetooth transceiver module, pc mountable.
I plan to layout a small pc board so a small footprint, no enclosure is what I am looking for. Distance will be < 10ft so, Class 2 should be fine.

Does anyone have any recommendations for one? ... success stories?
I'm a noob at this.

Thx,
Rob

linuxgeek
05-10-2013, 03:25 PM
I ordered one of these:
http://wiki.openpilot.org/display/Doc/Serial+Bluetooth+Telemetry

from here:
http://www.goodluckbuy.com/serial-bluetooth-rf-transceiver-module-rs232-w-backplane-enable-and-state-pin-1.html

BTW, it took about 2 weeks to receive it in the mail from this place but it's a good price.

But I can't report success yet, as I haven't had a chance to delve into it yet.

MichaelMeissner
05-10-2013, 09:39 PM
FWIW, I bought this HC-05 bluetooth transceiver, from the ebay seller nyplatform, and IIRC, I received it in a few days (I live in Massachusetts, USA): http://www.ebay.com/itm/HC-05-Bluetooth-Transceiver-Host-Slave-Master-Module-Wireless-Serial-6pin-/321120060216?pt=LH_DefaultDomain_0&hash=item4ac43f4338

It seemed to work when I tried it on the teensy 3.0, hooking it up to the 3rd serial port and connecting to it via my Android phone.

albireo13
05-23-2013, 02:14 PM
FYI ... I ended up buying this BT module:
https://www.virtuabotix.com/product-information/?productid=609224531705#tabs2-tab
I've powered it up and have successfuly paired it with my Nexus 7 tablet.
So far so good. Next is to do a loop-back test, followed by interfacing it to my Teensy 2.0 module!

linuxgeek
05-23-2013, 05:45 PM
I can now report that the one I purchased works, and works from the 3.3V pin off teensy3.

mortonkopf
07-13-2013, 02:58 PM
for anyone following up on this, I have used the HC-07 module (JY-MCU) with the Teensy 3.0, without any issues. I used this with an Android phone running the free app called BTInterface as a controller for an LED array.

linuxgeek
07-13-2013, 03:22 PM
for anyone following up on this, I have used the HC-07 module (JY-MCU) with the Teensy 3.0, without any issues. I used this with an Android phone running the free app called BTInterface as a controller for an LED array.

That looks like a pretty inexpensive option. I see it for around $6/each.
It seems that 115,200 is the maximum transfer rate.

How do you connect it up? Where are the connectors?

mortonkopf
07-13-2013, 03:33 PM
its really straight forward. the BT module has four pins plus two additional connection pads. The four pins cover Rx Tx vcc and gnd. All you need to do is to connect the Rx to Teensy Tx and Tx to Teensy Rx. I used Teensy pins zero and one. I run the module from a battery pack of four rechargeable AA batteries. The two additional pins are for Key and state, but I am not using these at the moment.

linuxgeek
07-13-2013, 04:20 PM
The one I saw was this, which didn't seem to have any connectors:

http://www.goodluckbuy.com/hc-07-bluetooth-serial-port-bluetooth-serial-module-bluetooth-module-1.html

mortonkopf
07-13-2013, 06:30 PM
The ones with connectors are on a module board. The images here show how the module sit on the board.
http://www.ebay.com.au/itm/Bluetooth-RS232-TTL-serial-Converter-Module-LED-Adapter-Daughter-Board-/200814932551

you can pick up a cheapish BT module on a board with pins easily, for example (although I did not use this supplier):
http://www.ebay.com/itm/Wireless-Serial-4-Pin-Bluetooth-Module-Slave-Module-Board-For-Arduino-/170896942880

jonn26
07-15-2013, 11:34 PM
I too have had good luck with the JY-MCU HC-07. I have ordered several from here and they are less than $7 with free shipping if you don't mind waiting a couple weeks for delivery.

http://www.fasttech.com/products/0/10001791/1129204-jy-mcu-hc-07-bluetooth-wireless-serial-port-module