How to make a frequency sweeper?

jodank · Joined: 22 Apr 2014 Posts: 49

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 )

wieczus · Joined: 11 Apr 2006 Posts: 18

Hello,

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

Thomas

jodank · Joined: 22 Apr 2014 Posts: 49

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.

JC · Joined: 15 Dec 2007 Posts: 627 Location: Cleveland, OH

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

wieczus · Joined: 11 Apr 2006 Posts: 18

jodank · Joined: 22 Apr 2014 Posts: 49

[quote="wieczus"]

jodank · Joined: 22 Apr 2014 Posts: 49