PIC with Bluetooth adapter - Electronic Circuits Projects Diagrams Free

Oznog · 13th October 2009, 09:35 PM

I need to use PIC with wireless comm.
I saw the "wireless modems" at Sparkfun, they're impressive but pricey.

I can get USB Bluetooth adapters for next to nothing, with "up to" 100m range. This sounds dandy and meets my bandwidth requirements.

However, using a PIC as a USB master may be too problematic. Well, I know it can, but only a few PICs can be USB masters and I need a wider choice of chips. And the USB layer doesn't help me at all, I just need to send some data here. The FTI USB-to-rs232 chips are actually USB slaves with an rs232 interface- so the UART interface can't actually make it act as a USB master to control a BT-USB adapter. Plus, an extra "specialty" chip is generally too more awkward than I would want this to be.

Are any of these USB adapters known to be "hackable" where I can cut it open and wire directly into a logic-level, nondifferential UART on the hardware? This would be extremely useful.

blueroomelectronics · 13th October 2009, 09:40 PM

Have you looked at XBee wireless
The bluetooth USB devices are only half a solution, they need your PC to do most of the work.

Oznog · 13th October 2009, 10:05 PM

Again, I'm looking at cheap, to keep them useful for many small projects. $20 modules are pretty high "up there" for that. I can get USB-BT adapters for like $3.

Of course if it won't work it won't work. Do you have links describing what part the PC takes in handling the protocol? It's not uncommon to find a UART interface on a USB device though. Most GPS sold as USB devices have a TTL UART pin on board which is much easier to interface with a microcontroller, for example. I guess I'll get one of these USB-BT adapters, crack it open, ID the chip, and look up its spec first.

Basically I'm looking for someone familiar with this specific hacking-a-USB-BT-adapter problem.

Hero.sl · 14th October 2009, 07:02 AM

Some of thoese FTI USB - RS232 chips act as USB host controllers, yet I think you will have to implement a huge code to get a USB dongle working.

Check these links
http://www.seeedstudio.com/depot/ser...ter-p-279.html
http://www.seeedstudio.com/depot/ser...ave-p-501.html

They are bluetooth-serial modules I found. They are fairly cheap comparing to ones at Saprkfun. I'm going to order one of them(Master or Slave) to make my PIC communicate with a mobile phone. But I haven't tested anything yet. Hope this helps..

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13th October 2009, 09:35 PM	#1
Oznog	PIC with Bluetooth adapter I need to use PIC with wireless comm. I saw the "wireless modems" at Sparkfun, they're impressive but pricey. I can get USB Bluetooth adapters for next to nothing, with "up to" 100m range. This sounds dandy and meets my bandwidth requirements. However, using a PIC as a USB master may be too problematic. Well, I know it can, but only a few PICs can be USB masters and I need a wider choice of chips. And the USB layer doesn't help me at all, I just need to send some data here. The FTI USB-to-rs232 chips are actually USB slaves with an rs232 interface- so the UART interface can't actually make it act as a USB master to control a BT-USB adapter. Plus, an extra "specialty" chip is generally too more awkward than I would want this to be. Are any of these USB adapters known to be "hackable" where I can cut it open and wire directly into a logic-level, nondifferential UART on the hardware? This would be extremely useful. __________________ I thought what I'd do was I'd pretend I was one of those deaf-mutes.

13th October 2009, 09:40 PM	#2
blueroomelectronics	Have you looked at XBee wireless The bluetooth USB devices are only half a solution, they need your PC to do most of the work. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

13th October 2009, 10:05 PM	#3
Oznog	Again, I'm looking at cheap, to keep them useful for many small projects. $20 modules are pretty high "up there" for that. I can get USB-BT adapters for like $3. Of course if it won't work it won't work. Do you have links describing what part the PC takes in handling the protocol? It's not uncommon to find a UART interface on a USB device though. Most GPS sold as USB devices have a TTL UART pin on board which is much easier to interface with a microcontroller, for example. I guess I'll get one of these USB-BT adapters, crack it open, ID the chip, and look up its spec first. Basically I'm looking for someone familiar with this specific hacking-a-USB-BT-adapter problem. __________________ I thought what I'd do was I'd pretend I was one of those deaf-mutes. Last edited by Oznog; 13th October 2009 at 10:44 PM.

14th October 2009, 07:02 AM	#4
Hero.sl	Some of thoese FTI USB - RS232 chips act as USB host controllers, yet I think you will have to implement a huge code to get a USB dongle working. Check these links http://www.seeedstudio.com/depot/ser...ter-p-279.html http://www.seeedstudio.com/depot/ser...ave-p-501.html They are bluetooth-serial modules I found. They are fairly cheap comparing to ones at Saprkfun. I'm going to order one of them(Master or Slave) to make my PIC communicate with a mobile phone. But I haven't tested anything yet. Hope this helps.. Last edited by Hero.sl; 14th October 2009 at 07:03 AM.