# AT Commands

**URL:** <https://community.sparkfun.com/t/at-commands/1729>\
**Category:** Wireless & IoT\
**Created:** [April 12, 2006, 3:16pm UTC](https://community.sparkfun.com/t/at-commands/1729 "2006-04-12T15:16:08Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![umar](https://avatars.discourse-cdn.com/v4/letter/u/59ef9b/32.png) [@umar](https://community.sparkfun.com/u/umar)\
**Post date:** [April 12, 2006, 3:16pm UTC](https://community.sparkfun.com/t/at-commands/1729/1 "2006-04-12T15:16:08Z")

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I am a student and working on my final year degree project, I purchased bluetooth radio from spark fun, I have following question

1. From where i can get the AT commands for interfacing bluetooth radio ?

2. Can i send AT commands directly from 8051 microcontroller ?

Waiting for urgent response…

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**Author:** ![mrmerell](https://avatars.discourse-cdn.com/v4/letter/m/c68b51/32.png) [@mrmerell](https://community.sparkfun.com/u/mrmerell)\
**Post date:** [April 12, 2006, 4:44pm UTC](https://community.sparkfun.com/t/at-commands/1729/2 "2006-04-12T16:44:01Z")

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Hi ,

To use the AT command such as ATSI,8 … ATSW20 … and others , i use the MicroC’s USART . U can download here :

When u run the MicroC program , u can press Ctrl+T . Its called USART Terminal .

AT commands u can download from SparkFun’s website (i think blueradios)

About sending command from 8051 … i’m not sure … thats all i know

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**Author:** ![umar](https://avatars.discourse-cdn.com/v4/letter/u/59ef9b/32.png) [@umar](https://community.sparkfun.com/u/umar)\
**Post date:** [April 13, 2006, 5:28am UTC](https://community.sparkfun.com/t/at-commands/1729/3 "2006-04-13T05:28:24Z")

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I did not get the URL from your reply, would you please send me again…

Next I think if we can send commands from serial port of computer to bluetooth radio then there should be no problem with microcontroller.

Waiting for your response…

Umar

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**Author:** ![mrmerell](https://avatars.discourse-cdn.com/v4/letter/m/c68b51/32.png) [@mrmerell](https://community.sparkfun.com/u/mrmerell)\
**Post date:** [April 14, 2006, 8:56am UTC](https://community.sparkfun.com/t/at-commands/1729/4 "2006-04-14T08:56:18Z")

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Sorry , forgot to write …

[http://www.mikroelektronika.co.yu/](http://www.mikroelektronika.co.yu/)

very nice … and got many examples

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**Author:** ![\_Bleach](https://avatars.discourse-cdn.com/v4/letter/_/b9bd4f/32.png) [@\_Bleach](https://community.sparkfun.com/u/_Bleach)\
**Post date:** [April 20, 2006, 8:38am UTC](https://community.sparkfun.com/t/at-commands/1729/5 "2006-04-20T08:38:33Z")

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Yo

Just some advise, to connect to the serial port of computer with Bluetooth (Bluestamp). you need to carefuly check what voltage level you are connecting to.

BlueStamp works on 3.3volts level. but RS232 serial port on computer is about +/- 25volts (or some below than that).

Anyway, for matching this you gotta need some voltage level shifter (similar function to Max232 circuit)

Sparkfun also has ones;

check this out;

[http://www.sparkfun.com/commerce/produc … cts\_id=449](http://www.sparkfun.com/commerce/product_info.php?products_id=449)

Note; if your micro, u mentioned, is already in the same level then just go ahead and let them talk.

I hope this helps.

Peace 😃