Hoping someone will help me with code concerning timer

[flat5]

"The last parameter is timeout...."
Yes, well, moving on...
What does the 136 do in your code? Why is it there?

 

[Ian Rogers]

68us high time... I'm assuming 68us low time ( frequency )

 

[flat5]

I find the ratio of the dit/dah time to be correct but otherwise useless.

This is what the scope sees on the collector of the mic preamp.
This point goes to D7 on the Arduino.
Scope shows one cycle ~2.3 ms. However tone freq. is 1029 Hz. and wpm = 20.

I could re-bias the transistor but will wait till the NE567 (s) arrive and then play with the preamp.

 

[Ian Rogers]

Then your results are ok.. Your dit's are three times shorter than your dah's.. Why do you deem them useless..

If you are trying to receive 20WPM with an average of 5 characters per word... around 1 and 1/2 characters per second... If the timeout in pulsein() was reduced to 250mS you should be able to receive characters and process them..

 

[flat5]

I have a perfectly working decoder...for clean code, not 'off the air'. That's coming. A display not using a computer is wanted too.
That may be a big re-write. I don't know yet.
https://www.electro-tech-online.com...decoder-my-first-project.144143/#post-1217761
This thread is about automatically finding the code speed.

 

[flat5]

BobW made a suggestion that is looking more interesting.
https://www.electro-tech-online.com...decoder-my-first-project.144143/#post-1214736
If I count the combined PulseIn high times for say, ten seconds, and average them, I would have a base to work from and not worry if a signal is a dit or dah.
However, if Tommy Omott sends his name and "1900 to 1999", I would have a problem

 

[Ian Rogers]

I was watching this

http://www.embedds.com/avr-interprets-morse-code/

This is where web site is located... The PDF shows how it has been done... The link in the second paragraph called "REport"

**broken link removed**

 

[flat5]

Interesting! I've downloaded the code.
**broken link removed**
So far, I've wasted time correcting the comments in morse_codec.c and morse_codec.h.