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Picture of Treo 650 IR Mod
This will show you how to mod your treo 650 to greatly increase it's IR transmitting range.

Disclaimer:
This is a rather difficult mod involving soldering directly to an expensive phone and using very small surface mount components. This tutorial assumes moderate soldering skills and the ability to read schematic diagrams. I take no responsibility for broken phones, burned fingers, popped eyeballs, wasted money, bar fights, lost time, gained time, pissed off girlfriends, pissed off parents, or your death... alone at your mom's house.


Parts:
1 NPN transistor
1 infared phototransistor
1 infared led
tape
small gauge wire

Tools:
soldering iron
wire strippers
fingers
camera
teeth
hex screwdriver
breadboard
drill
 
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Step 1: Test the components

Picture of Test the components
Once you gather the components, wire up the circuit on a breadboard to make sure they all work.

Step 2: Open the case

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This can be tricky. First off, it has hex screws, so you'll need a funky screwdriver, or a tiny flat-head screw driver, secondly, be careful of the ribbon cables, they are as delicate as they are thin.

Step 3: Remove the transciever cover

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Heat the little tab with your soldering iron and use a jewler's screwdriver to pry the cover off. This step is necessary.

Step 4: Make room for the new sensor

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You'll need to be creative on this one, just remember that the treo's ir led is the bump on the left side of the transciever, also remember that the transciever is encased in epoxy that is transparent to infared light, so you can put the sensor to the side.

Step 5: Mount the sensor and find a power source.

Picture of Mount the sensor and find a power source.
Mount the sensor where you think it will fit, and connect a wire to the leftmost pin on the transciever. this will be your positive lead.

Step 6: Ground it!

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Attatch a wire to any metal casing. this will be your ground (negative) lead.

Step 7: Wire up the circuit.

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I leave this part up to you as well, as your particular treo and parts may vary. I freeformed it on mine. (for those who don't know, freeforming is soldering the circuit without a circuit board)

Step 8: Make room for the circuit

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Trim the inner antenna to accommodate the new amplifier circuit.

Step 9: Put a hole in the outer casing.

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Using a drill, screwdriver or hot nail, put a hole in the antenna cover for the led.

Step 10: Put the palm back together (except for the antenna)

I hope you remember how it goes together! push the led through the hole and put the antenna cap back on. be careful of the ribbon wires, and make sure you align the LCD cable properly in it's socket or the color may be messed up, or your touchscreen may not work.

Step 11: Test it and make sure you didn't screw up.

Picture of Test it and make sure you didn't screw up.
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Put the battery back in and make sure it boots and the screen/touchscreen still works. Start a program that uses the IR port. Get out your digital camera and point your palm at it. it should be pretty much blinded by the light. if it isn't check for shorts, and make sure the sensor is in a good position. (and is still attatched ;)

Step 12: Mischief

Now that your palm has an infared blaster, you can put it to more productive use... sure you can send files across the room, but that's boring, what you need is a remote control program.
If you're broke, you can use Omniremote 1.171, as it's no longer supported by it's developer. (but it's a learning remote, so it needs training)

If you're not broke, i highly recommend novii remote as it comes with many codes for many devices.
i was able to do this same hack, i didnt need the ir receiver so i removed the entire trans-ceiver module, soldered to the 3.3v+ gnd, and ir out of where the transceiver was. But I think i used a pnp, i dont remember now, but all 3 wires went to where the old module was and it works fine. no on/off switch needed, draws almost no current while off, but like 20ma while transmitting IR signals. by the way im using this as a remote control now for my treo 700p i get like 10 foot transmit distance.
Ghost Wolf5 years ago
I'm getting a palm tx and I wanted to know if this would boost it's range.
joe57005 (author)  Ghost Wolf4 years ago
it could, but you'd have to find the room in the case for the parts, and some means of powering it.
oh It would look a little weird now that i think of it
kill-a-watt7 years ago
what seems strange is that you look like you are using a photocell to get the signal, instead of tapping the circuit board directly. I would think you could lower your parts count The only other issue would be the standby power. I toggle IR off on my palm because I use it so little. What's the standby current drain? Great job! I have no idea why a hack like this never came out five years ago with the first release of Omniremote
joe57005 (author)  kill-a-watt7 years ago
Yes, it's using a photocell. The palm's transmitter is actually an irda chip, so the led, phototransistor and serial interface are all buried deep in the reddish-black epoxy, which means there's no way i can tap into the led directly. As for drain, i have no idea, nor the equipment to test it. so in lieu of measuring the actual amperage, i will leave the mod activated all night and see how low the battery is in the morning. Based on it's performance thus far, i seriously doubt the charge will be less than 90%, though ambient light (or the lack thereof) will have a great effect on it's drain, so this won't be very accurate.
joe57005 (author)  joe570057 years ago
After 10 hours with the hack enabled, the power level went from 100% to 99%. Not too shabby!