1) Wake up of the controlled by the HP
In fact, with this circuit, we simulate the action on the
pushbutton power (during 1/2 second with an delay of about one second). This is triggered
by onpening/closing the serila port of the hp. There is a part I have called "silly
bridge" on the schematic because the analogic levels are not well adapted.
For the moment, the circuit is powered by an external power 5V 300mA regulated with a chip
7805 because I don't want to use power of the pc.(I could do that as it only requires 25mA
when the relay switches). I use a DC5V from OMRON (G5CE-1, contact 15A at 125V) available
at radiospares for 25F.
The two nands gates U1B and U1D are set to build an flip-flop (memory of one byte , used
here against bouncing effects) SET (force 1 level on the pin
6 of U1B when the pin 4 has been at 0 once) RESET (force 1 level of the
pin 11 of U1B when pin 13 is low) active on low levels. There is a forbidden case
(SET=RESET=0) which is avoided as the C3 condensator gives RESET on power ( thus the
pin 11 is hight ).
If the serial port of the hp is closed, the
voltage is not the ground so the lock done by diodes 1N4148 on condensators is
removed so C1 and C2 load exponentaly to +5V. On the input 9 of U1C, the level will
be 1 after a delay proportionnal to R2*C2, activating the relay. After the time
R1*C1*ln(2) , the circuit U1A see also 1 level on its input and 0 on the output.pin 3
(inverter),. This immediatly triggers the SET of the flip-flope RS: lthe
output 6 of U1B toggle to 1 whereas the pin 11 fall to 0. The nand circuit U1C see
then a 0 level on one of his two inputs (pin 10) and its output set to1, opens the relais.
Conclusion: the pc light on without pressing the pushbutton
if this montage is powered after the pc or if we forget tu put jumpers
between 1 & 4 and 2 & 3 on the socket SW DIP-2. If we ommit to put a jumper
between 2 and 3 , the system is furthemore not retriggerable (pc can't be
switched off by the same meaning). As there is no voltage adaptor (silly bridge), for the
moment put the jumper between 2-3. For those who want the light on / light off the pc this
circuit works fine and requires a tiny program in Rpl that I launch
inside an alarm: «openio 1 wait closeio » .
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Here is exposed my test board where you can see a free wheel
diode on the copper side.
Lets talk about the connectors : the output of the relay (green connector on the left high
corner) should be connected to the motherbord at the place of the two wires of the PC
pushbutton. (power SW) - see the Motherboard documentation for determining were
connecting it.
The middle connector is the 5V power suppler whereas the bottom connector should be wired
to the hp48 serial port.
2) Triggering PC programs with the HP
You must have an HP (of course), a wire PC/HP , a PC with a
serial port free and download the wonderful Irassistant program (see instructions
below).
I have a story to told to you. As I like a lot linux (see my web only in French sorry), I discover the
program Irassistant through one of LIRC
project:
UIR
(Universal Infrared Receiver alias Irman brother) from Ties Bos and decided to
make some reverse engineering on the protocol (ouh the bad guy, he has done it). It took
me a long time to have the idea to replace the UIR module (I have build 5 for my friends -
so I will push the French documentation if Ties Bos agrees) by an HP.
Are you ready , let's go..
1) Download Irassistant (free for non commercial purpose)
from the official website (about
5mo)
2) Install the software (click twice on
setup.exe) ,, don't reboot yet, and copy irman.dll in the
'installation folder.
of irassistant (C:\Program files \ Irassistant ) . Reboot now the PC.
3) While the PC is rebooting, type on HP the following RPL
programs:
| File INIT (bytes #42549d taille 55.5 ) |
File XRC5 (bytes #26374d taille 76 ) |
« 2 SRECV DROP DROP
1 10 FOR P
"XOK" XMIT DROP
NEXT
» |
« -> RC5
« "" RC5 SIZE 1 SWAP FOR I RC5 I GET
CHR + NEXT XMIT DROP
»
» |
4) Link the hp to pc with the serial wire and set link to
Wire, binary, 9600 bauds, no parity
5) Execute the program INIT on the hp and lauch immediately Irassistant .
I bet you will get an error message such as"device not detected" because
the serial port of irassistant does not correpond to
whose you connect the HP. For changing this type simultanously CTRL-S. A windows
appears:
This is the settings window. In the section drivers,
select Irman UIR, PCCommander (if you don't see it you have forgotten to copy irman.dll-
see step 2 click on it to download). Change then the port to agrees with those HP (for
example COM2 if COM1 is used by your mouse). Validate by ok / apply your change.
6) Close Irassistant.
7) Repeat steps 5 and 6 while the error message remains. Do not
close Irassistant if it is okay.
8) A learn phase of the keys of your remote control (here the hp
replaces it) should be done and the actions linked to the keys defined. For each key
of your remote ( a key = will be a program on your hp which simulates the key pressed )
proceed as below:
In the area (1) give a name of the button
b) Link the action to do (2) by clicking on New and define
the sub actions
The button called "Son+" :
-will have an action labelled "augmenter le volume"
- the press of the button will triggers the command volume up (choose one or more sub
action(s) in the left macro list then for each action press on add to add this into the action. As we got only one sub-action, this
will have for effect to increase volume by one step.
c) Click now on Learn, to make Irassitant learn the Ir
signal simulated by the hp through the wire. This can be done
by creating a specific program on hp (the best is to give the name of the button
SONPLUS ) whose content is:
| SONPLUS |
| « { 254 224 0 0 0 0 } XRC5 » |
and executing several times one after the other.(4
times at least).
We notice that Irassistant reads FD E0 00 00 00 00 which is in fact the hexadecimal
conversion of each value the liste inside the program SONPLUS (FD=254d, E0=224d,...). This
value list should normally correspond to an unique RC5 séquence (invented by
phillips). Take care then not to use the same sequence for two buttons.
9) You can now increase the sound by running SONPLUS on HP . The
possiblities are infinite as you only need to make a new list for each action and only the
memory of the hp can limit you. The actions on the PC triggered can we very sophisticated
too. If it happens to you to see the error message back (mistake from your part, bad
manipulation), don't worry use the INIT program to restablish the link (this
silly PC will believe that an UIR module is present . Have fun !!!!!!!!
For those who want to learn more, there is a well made FAQ HP48
