Hi, so I made the measurement. You wanted to achieve the following:
I could not measure anything, so I tried to look at the serial line, as there is nothing in the IR tower that should not be working. However, I could measure only this:
The suspicious thing is that when repeating it for ca. 10 times, suddenly one random execution of the program generated the full correct sequence:
And even with the correct width, as seen in the detail of the first impuls (0,83 = 1/1200)
Unfortunately, I could not repeat the same result for the second time.
Conclusion:
The error must be already in the transmission, only the
first impuls is usually sent. Randomly after many trials, also the rest of the
sequence gets generated. The error should not be in the IR tower, but in the
transmission. The images show the signals on the pin TxD, they have the
correct amplitude +/-10V, and the timing seems to be OK too.
Riso
© 2005 Richard Balogh and authors.