*** Adjustable DC power supply for IPAD & also wake it using M1RB?

[Mp333]

Looking to power the ipad which is extended about 25 ft from where the power source will be with a CAT5 cable. The supplied Apple 2.1 will trickle charge the ipad slowly. Looking to bump up the voltage slightly @3A hopefully. This way it will have enough juice to charge and have the ipad on for longer durations. I found some on -bay which doe not look like has the D+&D- voltage on pin 2&3 which Apple uses to identify the charger.
Hope I can use M1RB to pass the +5v line to be able to wake the ipad using a rule.
 
Any body had any luck with some thing similar?

 

 

[RAL]

Cat5 cable typically consists of 24 AWG conductors, which are rated for a maximum current of a bit over 0.5A.   So you would need to use at least 4 conductors for +V and 4 conductors for ground to provide an adequate connection capable of carrying the load.  Even then, using multiple conductors in this way is not a good idea.
 
Increasing the voltage also isn't a good solution. The charging/regulating circuit in the iPad is just going to reduce it back down to what the battery requires anyway.
 
The right solution is to run an adequate power cable using 18/2 wire to the iPad. 

 

[tmbrown97]

I don't think you'll have a ton of success at waking the ipad by a rule - even if you did, it'd just wake to the lock screen.  There maybe some options out there if you jailbreak it though.
 
For powering over distance, I like this option - but it's not cheap: http://www.cableorganizer.com/fsr/poe-to-usb/

 

[Del91574]

RAL,
There's ways to get that sort of power over a Cat cable but you're going to be getting into the POE  or POE+ game....it can be done with POE but now you're looking at additional infrastructure and then how you're going to regulate the voltage down.
 
Ohm's law in it's basic form.

 

[RAL]

There's ways to get that sort of power over a Cat cable but you're going to be getting into the POE  or POE+ game....it can be done with POE but now you're looking at additional infrastructure and then how you're going to regulate the voltage down.
 
Ohm's law in it's basic form.

 
Yes, you're absolutely right.  POE cranks up the voltage significantly to deliver higher power and can use all 4 pairs, depending on the power required.  But my response was really to the OP's approach of using just 5V or so to power the iPad.   That's just not going to work very well over Cat5. 

 

[Mp333]

I have two setup at the moment running on 10w iPad charger. One using four wires for positive and four for negative. Another one has two wires for each USB pins. Vcc, Neg,D+ and D-
Both seemed to charging the ipad3 at a slower rate since it has bigger battery than the ipad2. Within 24hrs if brings it up to full charge. If you have your iPad on with auto lock at 15 min you would be fine. However if you plan to leave it on all the time then it would drain the battery and charger won't be able to keep up. My next test would be to use variable USB dc regulator running at 5.25v @ 3A to see if that will suffice.
Also the iPad needs to see a specified voltage on the D pins other wise it will say not charging.
If it doent work I will install an outlet in the basement closer to the iPad and power it from there.