Re: Recommend a homebrew parallel port receiver?

[Stian D. <dav...@sa...>]

Piers Kittel wrote:

> Hello all,
>
> Can someone show me a website that explains how to make a homebrew 
> parallel port IR receiver please?  Rather not have the transmitter as 
> well in the package, just the receiver.

Use the one on lirc.org, and remove the transmitter and the 38kHz part 
of the frequency generator. (Modified diagrams included below, view with 
fixed width font)

Use the same parts as described here: http://lirc.org/parallel.html
You can use a NE555 instead of the NE556 if you like, and you drop one 
R2, one C1, one C2 and the R4. (It is possible you should do something 
with pin 8-13 on the NE556, now that they're not in use)

You may have to change the sourcecode a bit (I had to remove the check 
for a connected printer, in(1)&LP_PSELECD)

- Stian

Frequency generation:


            C1
            ||             +----------+             +----------+
 GND o------||------+------|    R1    |------+------|    R2    |-----o Vcc
            ||      |      +----------+      |      +----------+
                    |                        |
                    +---------+-----------+  |
            C2                |           |  |
            ||                |           |  |
 GND o------||-------------------------+  |  |
            ||                |        |  |  |
                              |        |  |  |      +----------+
BUSY o------------------------|--+  +--|--|--|------|    R3    |-----o Vcc
       65536 Hz               |  |  |  |  |  |      +----------+
                   GND o---+  |  |  |  |  |  |
                           |  |  |  |  |  |  |
                         +-+--+--+--+--+--+--+-+
                         | 7  6  5  4  3  2  1 |
                         |                     |
                         |        NE556        |
                         |                     |
                         | 8  9 10 11 12 13 14 |
                         +-+--+--+--+--+--+--+-+
                                             |
                                             +---o Vcc
Receiver circuit:


 GND o------------------------------------+
                                     C3   |
                                     ||   |   +--------------+
                                +----||---+---|1             |
                 +----------+   |    ||       |   =========  | <---
 Vcc o-----------|    R5    |---+-------------|2  SFH506-38  | <---
                 +----------+                 |   =========  | <---
                                          +---|3             |
                                          |   +--------------+
/ACK o---------------------------------+  |
                                       |  |
                GND o---+-----+-----+  |  |
                        |     |     |  |  |
                      +-+--+--+--+--+--+--+-+
                      | 7  6  5  4  3  2  1 |
                      |                     |
                      |       74HC04 (**)   |
                      |                     |
                      | 8  9 10 11 12 13 14 |
                      +-+--+--+--+--+--+--+-+
                           |     |     |  |
                           +-----+-----+--+---o Vcc