Search found 91 matches

by LukeW
Thu Mar 22, 2012 3:32 am
Forum: USBDroid
Topic: Turn USB Host Power Out On and Off
Replies: 6
Views: 5694

Re: Turn USB Host Power Out On and Off

The problem here, I think, is that a N-channel MOSFET can't really be turned on properly in a simple high-side-switch circuit unless you use extra circuitry to drive the gate appropriately. (For a low-side switch, however, a N-channel is fine.) The way to do it most easily in a high-side-switch conf...
by LukeW
Wed Mar 21, 2012 7:39 am
Forum: Module Discussion
Topic: Power-over-Ethernet Regulator 802.3af
Replies: 8
Views: 5890

Re: Power-over-Ethernet Regulator 802.3af

The 802.3af controller/enumerator chip in the Freetronics 802.3af module is likely to behave very strangely or not work at all if you feed it a voltage which is inconsistent with a standard 802.3af network. It will probably think that there's something wrong with the network because the voltage is t...
by LukeW
Wed Mar 21, 2012 7:29 am
Forum: Random Chit-Chat
Topic: fsa03 gps module for the mobsendat
Replies: 2
Views: 2767

Re: fsa03 gps module for the mobsendat

Oh, somebody actually has one of those? :) I have no idea where to get the bloody FSA03 GPS module. The GlobalTop FGPMMOPA6B GPS module that you've linked to will certainly be workable, it will basically just be a matter of just wiring up the +3.3V rail, ground, Tx and Rx to the appropriate points a...
by LukeW
Wed Mar 07, 2012 8:50 am
Forum: Eleven
Topic: Soldering sparkfun's RTC onto the proto area
Replies: 3
Views: 4427

Re: Soldering sparkfun's RTC onto the proto area

Basically, you can just solder some bits of wire to the pads on the bottom of the prototyping area to connect Vcc to +5V, ground to ground, and SDA and SCL to Arduino A4 and A5 pins. The square wave output doesn't need to be connected up. If the Sparkfun breakout board you're using includes the I2C ...
by LukeW
Sun Feb 12, 2012 12:33 pm
Forum: SH-RFIDLOCK: RFID Lock Shield
Topic: Suppliers for RFID reader
Replies: 2
Views: 4720

Re: Suppliers for RFID reader

The ID-12 should do the trick, right? It seems to be a pretty common choice.

http://littlebirdelectronics.com/produc ... eader-id12

http://www.toysdownunder.com/rfid-id12.html
by LukeW
Sun Feb 12, 2012 10:45 am
Forum: LeoStick
Topic: Does the LeoStick ship with headers soldered in?
Replies: 1
Views: 2112

Does the LeoStick ship with headers soldered in?

Does the LeoStick ship with headers soldered in? I think it would actually be best to ship it with no headers soldered in (but include the headers with the product) or to offer customers a choice to purchase the version with headers soldered or not. Because it's pretty easy to solder in those header...
by LukeW
Wed Feb 08, 2012 3:55 am
Forum: Module Discussion
Topic: Hall effect sensor
Replies: 1
Views: 2181

Re: Hall effect sensor

Maybe, you could try it. Of course it's going to be far less sensitive than a proper current transformer or a Hall-effect sensor with a toroidal core specifically designed for current sensing. Also keep in mind that if you've got a 240VAC cable with an active wire and a neutral wire right next to ea...
by LukeW
Wed Feb 08, 2012 3:52 am
Forum: LCDK: LCD & Keypad Shield
Topic: Adjusting Contrast??
Replies: 3
Views: 3432

Re: Adjusting Contrast??

Hi JTG, I know very little about electronics, but if you look at the schematic http://cdn.shopify.com/s/files/1/0045/8932/files/16x2LCDShieldv2.pdf you will see that the contrast connection from the LCD isn't connected to any arduino pins. It is connected to a 100R resistor. I suspect to get adjust...
by LukeW
Wed Feb 08, 2012 3:44 am
Forum: LCDK: LCD & Keypad Shield
Topic: LCD shield drilling plan
Replies: 4
Views: 5496

Re: LCD shield drilling plan

Hmm, that's a really good idea.

I could probably spend a little bit of time making this from the Freetronics eagle files for the board.
by LukeW
Wed Feb 08, 2012 3:43 am
Forum: Eleven
Topic: The dreaded stk500_getsync()
Replies: 5
Views: 6191

Re: The dreaded stk500_getsync()

The most common problems to consider are probably these: - Select the correct serial port prior to programming. - Install the driver for ATmega8U2-based boards if you're using Windows, not needed for other OSs. - Install the FTDI driver if you're using an older FTDI-based board (not relevant for mos...