ocarton wrote:1/would the girder driver accomodate for a higher number of emitters (ie use Z4xxx, Z5xxx and so on)?
No, but there is a second Girder Plugin (call it plugin #2) which can be used along with the regular plugin to drive two USB-UIRT's. When creating a command in Girder, you would then choose one of the two plugins depending on which USB-UIRT you want to transmit. See:
http://65.36.202.170/phpbb2/viewtopic.php?t=52&start=28ocarton wrote:2/ are there spare pins on the microcontroller to add emitters? If so, I am willing to give a hand (using my limited knowledge

) to modify a library of the microchip's code to use those spare pins.
No, unfortunately the USB-UIRT is more or less maxed out.
ocarton wrote:3/ is it possible to solder the two wires of the emitter led directly to the wires of the receiver led of my appliances (thus avoiding transmission problems and an ugly emitter sticked on my appliance)?
No and Yes. The IR receivers on most all equipment are usually an integrated IC which demodulates the carrier and has an open-collector output. The USB-UIRT in this case would need to be set to DC output (no carrier) in Girder. Also, you would need to build a transistor circuit to create a low-going open collector output from the IR jack (which drivers high). Third, I would be concerned about the possible implications of tying the DC ground from your USB-UIRT (which is derived from your PC's ground) to your A/C units.
-Jon
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Thanks for your answers.[/quote]