bluetooth rs232-ttl transceiver: wireless ExLink cable :)

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juusso
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bluetooth rs232-ttl transceiver: wireless ExLink cable :)

Post by juusso »

Today i found this gadget on dealextreme, just ordered couple. If it does what description says, then this is best ExLink cable for C/D/? series ever!
No cables, just external 3.3v power suply (from usb trough stabiliser LM1117 3.3v or other, DC stepdown module). And this only for $6,6 including shipping :)

So we can get exlink output to smartphone...

http://www.dealextreme.com/p/wireless-b ... dule-80711
bt_rs232.png

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* Wireless Bluetooth RS232 TTL transceiver module
* Allows your target device to both send and receive the TTL data via Bluetooth technology without connecting a serial cable to your computer
* Easy to use and completely encapsulated
* Chipset: CSR BC417143 http://www.csr.com/products/technology/bluetooth
* Bluetooth V2.0
* Working voltage: 3.3V
* Current: pairing 20~30mA, connected 8mA
* User defined Baud rate: 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200
* Default serial port setting: 9600, N, 8, 1
* Password: 1234
* Suitable for: mouse, keyboard, joystick; computers and peripherals; GPS receiver; instrument and industrial control 

Dimensions: 1.06 in x 0.51 in x 0.04 in (2.7 cm x 1.3 cm x 0.1 cm) Weight: 0.18 oz (5 g) 
will report back when i get and test this.

EDIT: Characteristics and how to use.
ImageImage
Datasheet: RF-BT0417C, BMX_Bluetooth_quanxin.pdf

Bluetooth_Module_L6.rar

same module on other stores:
http://www.mdfly.com/index.php?main_pag ... ucts_id=63 $9.95
http://www.goodluckbuy.com/serial-bluet ... tml?&sl=en $6.75

Interesting info:
http://www.bitartist.org/2010/05/androi ... odule.html
http://www.bitartist.org/2010/09/androi ... -lamp.html
http://www.google.lt/url?sa=t&rct=j&q=r ... cg&cad=rja
http://www.scribd.com/yashelectron/d/53 ... -ATcommand

Yah, i know, all you guys know how to use google :mrgreen:
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Re: bluetooth rs232-ttl transceiver: wireless ExLink cable :

Post by erdem_ua »

I am already using it for a year! :)
Instead use "backplaned" ones are easier to work with it.

Worst thing is you needed to re-connect on TV reboots if you pulling energy from USB, without any CAP.
Also device works with 5v. You don't need any voltage regulator. Instead could use a just diode. I think I forget to put how to built one :)

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juusso
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Re: bluetooth rs232-ttl transceiver: wireless ExLink cable :

Post by juusso »

Whad do you mean with "backplaned" ?
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Re: bluetooth rs232-ttl transceiver: wireless ExLink cable :

Post by erdem_ua »

Here is backplaned one with pins. For +$2. It's easier to work with them. Also they have voltage regulators on board. With it, you don't needed to solder anything. Just using 2 pins for RX/TX and spare a USB cable for power is enough...

http://www.ebay.com/itm/Wireless-Serial ... 1e6bfcc921

Image

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juusso
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Re: bluetooth rs232-ttl transceiver: wireless ExLink cable :

Post by juusso »

Can confirm, works for D series. But one notice: have to connect another exlink cable and set baudrate of BT module to 115200, because it is set to 9600 by default.
Swap rx-tx, open console with speed 9600 and put:

Code: Select all

AT+BAUD8
You should get:

Code: Select all

OK115200
http://wiki.openpilot.org/display/Doc/S ... +Telemetry
Works well and important: no cables!
This is how i use it on android phone...
screenshot-1338399118743.png

@Erdem, used up to 5x2200uF electrolyth capacitors, but on reboot terminall drops connection. Grr....
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Re: bluetooth rs232-ttl transceiver: wireless ExLink cable :

Post by prairie »

hey guys, I got one of these (TOMTOP from ebay) but can't get it into command mode to change the baud. Right now it's slave mode only so RS-232 connection just echo the input. I read something about pulling pin 34(PIO11) low to get it to boot in command mode but this pin seems hidden the way the chip is mounted. any ideas?
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juusso
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Re: bluetooth rs232-ttl transceiver: wireless ExLink cable :

Post by juusso »

You have to use another cable (with ttl voltage converter) for this goal, you can`t use your bt connection for that. This is serious limitation, but you need to make it only once. You can`t set boudrate if module is paired. So - unpair it first.

I used my ExLink, made from nokia ca-42 datacable, connected (soldered to) pins 1 and 2 of module.
Use connection speed of your wired cable 38400 - at this speed module accepts AT commands. Or if doesnt work, use 9600.
This is a bit annoyng, but from several tries i got it working in AT mode, but not from first try :)
Make sure you connect wired cable properly - rx-tx and tx-rx.
It is recommended to copy your required command to bufer and paste it at once

Code: Select all

AT+BAUD8
That`s all :)
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prairie
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Re: bluetooth rs232-ttl transceiver: wireless ExLink cable :

Post by prairie »

I tried all these things and unit never responds to any AT command through hardwire rs-232. I know it's working because I can send hardwire characters to the unit and see them echoed in the bluetooth terminal. When bluetooth is off I tried swapping tx,rx, pasting AT string, all speeds, nothing. I even tried voltage on what I think is pin 34 around outside of chip carrier as suggested here http://www.dankrill.com/lab/index.php?c ... =b&item=11
* PIO11, module state switching pin. HIGH -> response to AT command; LOW or floating -> regular work status.
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juusso
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Re: bluetooth rs232-ttl transceiver: wireless ExLink cable :

Post by juusso »

which one module do you have?
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prairie
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Re: bluetooth rs232-ttl transceiver: wireless ExLink cable :

Post by prairie »

The one in erdem's post, TOMTOP JYU-MCU BT_BOARD v1.02

I think the firmware onboard this one does not support AT commands and is slave only. I emailed ebay seller about it but no reply.
Last edited by prairie on Fri Jun 15, 2012 12:51 pm, edited 2 times in total.
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