No I didn;t use electrolyis caps.  I just realized that I have .01 uF caps.  The diagram requires .1 uF or 1 uF.  Thats likely my problem.  I did have a diagram that showed .01 uF but I cannot find it now.  I ordered 2 of the devices from sparkfun for now.
 
My voltage is coming from a DC to DC converter.  I have a Mean Well SKE15A-05 converter which I can either feed with a 11.2 LiPo battery or 12 V suply from the wall.  It gives a constant 5V.  I double checked it anyways and I do have 5 volts.  This feeds my gumstix and XPress Ethernet bridge as well.
 
 
----- Original Message -----
From: Black, Michael
To: General mailing list for gumstix users.
Sent: Monday, July 30, 2007 5:26 PM
Subject: Re: [Gumstix-users] TTL to RS232 converter

What’s your power supply?

I assume you did use electrolytic capacitors?

Do you indeed have 5V at pin 16?

 

Sounds suspiciouslyi like your capacitors are wrong somehow.

 

Can you post a schematic of what you did and maybe a picture too?

 

___________________

Michael D. Black

black@essexcorp.com


From: gumstix-users-bounces@lists.sourceforge.net [mailto:gumstix-users-bounces@lists.sourceforge.net] On Behalf Of Pat Winn
Sent: Monday, July 30, 2007 3:58 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] TTL to RS232 converter

 

http://www.sparkfun.com/commerce/product_info.php?products_id=449

Works quite well.

On 7/30/07, Peter Vandrish <peter.vandrish@gmail.com> wrote:

www.acroname.com has lots of level shifters ready to go

On 7/30/07, Michael Caughey < michael@caughey.com> wrote:

Has anyone been able to buy or make a TTL to RS-232 converter? 

 

I purchased a ST232 chip and some .1 uF capacitors and tried to create one, but it's not working.  the places where the voltage is supposed to be doupbled pin 2 +10 Volts and pin 6 -10 Volts its reading +/- 3.2 volts.

 

 

 

 

Thanks,
Michael

 

"In the beginner's mind there are many possibilities. In the expert's mind there are few."
-Shunryu Suzuki

 

 



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