MediaBox Blog - Latest comments on HOWTO: Home-brew IR receiver for LIRC Part 2

In response to: HOWTO: Home-brew IR receiver for LIRC Part 2

eschvoca [Visitor] — Wed, 18 Nov 2009 06:10:39 +0000

Great write-up. I simplified the circuit and interface to the computer and made some source code mods too. My posting is here:

http://ubuntuforums.org/showpost.php?p=8339472&postcount=6

If I could figure out how to set the timings of the pulses then the signal could be cleaned up and have the right timings for a given protocol, all the time. Currently the timings are not reliable enough from press to press.

In response to: HOWTO: Home-brew IR receiver for LIRC Part 2

pi.r [Visitor] — Tue, 10 Nov 2009 00:58:52 +0000

I just want to point out that the output of the IR-receiver TSOP1736 is an "open collector" with an internal 80 kohm pull-up resistor. This means that 80 kohm should be added to the value for R1, in the calculation of the output voltage from the voltage divider. So the calculation should be:
10/(80+22+10) * 5 = 0.446 V
(if 5 V is the supply voltage, then the correct value for the calculation is 5 V - nothing else...)

The internal pull-up resistor in TSOP1736 makes R1 completely unnecessary. Replacing R1 with a copper wire and selecting R2 = 15 kohm will give:
15/(80+15) * 5 = 0.789 V.
(I wouldn't recommend a higher output than ½ of max input voltage)

In response to: HOWTO: Home-brew IR receiver for LIRC Part 2

Tormod [Visitor] — Sat, 04 Oct 2008 23:56:22 +0000

Well, latest Ubuntu 8.04 only has an earlier version, so I had to patch it. Thanks a lot for making the patch and having it merged!

In response to: HOWTO: Home-brew IR receiver for LIRC Part 2

ceri [Member] — Wed, 01 Oct 2008 09:36:39 +0000

"No permissions to view file (not logged in)!"

Thanks for pointing that out. The link now works without being logged in. Although you don't really need it any more since the latest version of LIRC has the patch merged already

In response to: HOWTO: Home-brew IR receiver for LIRC Part 2

Tormod [Visitor] — Tue, 30 Sep 2008 22:20:22 +0000

"No permissions to view file (not logged in)!"

In response to: HOWTO: Home-brew IR receiver for LIRC Part 2

admin [Member] — Tue, 30 Sep 2008 21:11:27 +0000

The link to your patch is broken, but it can be found here: http://lirc.cvs.sourceforge.net/viewvc/lirc/lirc/daemons/hw_audio_alsa.c?r1=5.3&r2=5.4

What do you get when you click on the link, it seems to work for me?

In response to: HOWTO: Home-brew IR receiver for LIRC Part 2

Tormod [Visitor] — Tue, 30 Sep 2008 20:53:22 +0000

The link to your patch is broken, but it can be found here: http://lirc.cvs.sourceforge.net/viewvc/lirc/lirc/daemons/hw_audio_alsa.c?r1=5.3&r2=5.4