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How to make a frequency sweeper?

 
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jodank

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Joined: 22 Apr 2014
Posts: 49

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PostPosted: Thu Apr 06, 2017 11:38 pm    Post subject: How to make a frequency sweeper? Reply with quote

Hi!
I need some help to do this project:
I need to make a frequency sweeper with 5V square wave output duty cycle 50%,
effective frequency range from 50kHz to 50Hz .

Can I do this with the tone function or should I use a timer or what would be the best solution?
I would use some Attiny2313 or 85 maybe I think I have on stock.

Some example code would be great for start.

Thanks in advice.
My best regards.

(BASCOM-AVR version : 2.0.7.5 , Latest : 2.0.7.8 )
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wieczus

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Joined: 11 Apr 2006
Posts: 18

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PostPosted: Fri Apr 07, 2017 7:49 pm    Post subject: Reply with quote

Hello,

Are you trying to develop a TMS 374 based ECU unlocker?

Thomas
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jodank

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Joined: 22 Apr 2014
Posts: 49

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PostPosted: Fri Apr 07, 2017 9:09 pm    Post subject: Reply with quote

Hi Thomas!
Yes, but I will integrate some other function too to that tool and the major problem is
this sweeping stuff.

Thanks for any advice.
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JC

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Joined: 15 Dec 2007
Posts: 495
Location: Cleveland, OH

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PostPosted: Sat Apr 08, 2017 2:33 am    Post subject: Reply with quote

No where near enough information.

How fast does the sweep take?
1 Sec, 10 Sec, 0.1 Sec?

Does it sweep once, or repeat?
Does it wrap around, or sweep up, then down, then up...?

How precise must the 50% duty cycle be?
+/- 1%, +/- 1 uSec, etc?

How large an the frequency steps be?
1 Hz? 10 Hz, 10% of current frequency?

Can there be discontinuities in the signal when the frequency changes?

Lots of questions!
Clearly more info is needed.

JC
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wieczus

Bascom Member



Joined: 11 Apr 2006
Posts: 18

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PostPosted: Sat Apr 08, 2017 11:00 am    Post subject: Reply with quote

jodank wrote:
Hi Thomas!
Yes, but I will integrate some other function too to that tool and the major problem is
this sweeping stuff.

Thanks for any advice.


Email me priv. Will try to help you.

Thomas
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jodank

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Joined: 22 Apr 2014
Posts: 49

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PostPosted: Sat Apr 08, 2017 3:20 pm    Post subject: Reply with quote

[quote="wieczus"]
jodank wrote:


Email me priv. Will try to help you.

Thomas


Sorry but "Private messaging has been disabled on this board."

I can not contact you pm.
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jodank

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Joined: 22 Apr 2014
Posts: 49

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PostPosted: Sat Apr 08, 2017 3:35 pm    Post subject: Reply with quote

JC wrote:
No where near enough information.

Lots of questions!
Clearly more info is needed.

JC


Quote:

How fast does the sweep take?
1 Sec, 10 Sec, 0.1 Sec?

- the sweep takes around 90sec

Quote:
Does it sweep once, or repeat?
Does it wrap around, or sweep up, then down, then up...?

- sweeps onece
- sweeps down from lets say 10KHz to 100Hz

Quote:
How precise must the 50% duty cycle be?
+/- 1%, +/- 1 uSec, etc?

- must not be precise, maybe +/- 5%

Quote:
How large an the frequency steps be?
1 Hz? 10 Hz, 10% of current frequency?

- lets say 10Hz/steps

Quote:
Can there be discontinuities in the signal when the frequency changes?

- no discontinuity allowed.
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