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Making my own Powermat case, need help wiring and finding connector
Burns
Registered User regular
Registered User regular
I posted in the Android thread, but I suppose nobody had any ideas.
I decided that I wanted a Powermat (inductive charger) case for my Nexus S, so I bought a HTC Evo case and yanked out the coil + wire. I've verified that the wires put out 5V, so in theory I should be able to connect these to pins 1 and 5 of a micro USB connector. I've been reading about the charging spec, but I'm not sure if it applies in this case. Should I be shorting pins two and three? I've already torn apart the PCB and discarded it (stupid, I know), so I can't probe them to see if powermat shorted them in this way.
Also I'm on the hunt for a good low profile right angle connector that would integrate nicely with what I'm doing. I found a right angle (right angle up) on eBay, but that plug looks long. This is a fun project for me, so I'm willing to buy a device that comes with a plug that I'm looking for. I pretty much need a micro USB plug that has solder pas or wire terminals on the opposite face of where the bevel is.
So what I'm asking:
1) Do I need to short the data wires/pins D+ & D-
2) Anyone know where I can get a slim profile right angle micro USB plug?
I decided that I wanted a Powermat (inductive charger) case for my Nexus S, so I bought a HTC Evo case and yanked out the coil + wire. I've verified that the wires put out 5V, so in theory I should be able to connect these to pins 1 and 5 of a micro USB connector. I've been reading about the charging spec, but I'm not sure if it applies in this case. Should I be shorting pins two and three? I've already torn apart the PCB and discarded it (stupid, I know), so I can't probe them to see if powermat shorted them in this way.
Also I'm on the hunt for a good low profile right angle connector that would integrate nicely with what I'm doing. I found a right angle (right angle up) on eBay, but that plug looks long. This is a fun project for me, so I'm willing to buy a device that comes with a plug that I'm looking for. I pretty much need a micro USB plug that has solder pas or wire terminals on the opposite face of where the bevel is.
So what I'm asking:
1) Do I need to short the data wires/pins D+ & D-
2) Anyone know where I can get a slim profile right angle micro USB plug?
I case anyone wants to try this themselves, here are my observations:
-Removing the induction coil from the EVO case was ridiculously easy, the entire bottom of the coil has a weak adhesive keeping it on the opaque case. Black is ground and red is +5V (5.12VDC on the multimeter)
-I can mount the induction coil on a plastic case up to 2.28mm thick and still have the entire apparatus powered. Any more than that and the field generator shuts off and you get 0V.
-The Nexus S NFC reader will still read tags through the induction coil.
-The coil itself is mounted on a plastic backing, though I don't think there's any shielding (due to the above observation).
-The coil must be oriented with the PCB side down and the backing up, else the mat won't induce a current.
-Removing the induction coil from the EVO case was ridiculously easy, the entire bottom of the coil has a weak adhesive keeping it on the opaque case. Black is ground and red is +5V (5.12VDC on the multimeter)
-I can mount the induction coil on a plastic case up to 2.28mm thick and still have the entire apparatus powered. Any more than that and the field generator shuts off and you get 0V.
-The Nexus S NFC reader will still read tags through the induction coil.
-The coil itself is mounted on a plastic backing, though I don't think there's any shielding (due to the above observation).
-The coil must be oriented with the PCB side down and the backing up, else the mat won't induce a current.
I only posted here for the blue dot.
Burns on
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Mouser.com - it may be overwhelming but the search lets you get specific.
Jameco.com - good variety, search not so hot.
digikey.com - i haven't used them at all but a lot of people recommend them for sourcing parts.
I can't help you with 1), sounds like something to ask on allaboutcircuits or the make forums.
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