Search found 91 matches

by LukeW
Sun Jul 29, 2012 8:55 am
Forum: Product / Device Ideas
Topic: Battery shield
Replies: 6
Views: 5703

Re: Battery shield

I would really love to see a battery 'shield' for the leostick! Something that would boost the voltage from a single AA battery up to the requisite 5v to make it more easily portable would be fantastic. Single AA cell (1.2-1.5V) up to 5V at a current draw of about 100-150 mA is OK, you can do that ...
by LukeW
Sun Jul 29, 2012 8:48 am
Forum: Module Discussion
Topic: Power supply
Replies: 4
Views: 5550

Re: Power supply

Something like this, for example? http://www.digikey.com/product-detail/en/AWSP40-12/237-1298-ND/1010427 http://www.digikey.com/product-detail/en/VOF-6-12/102-2213-ND/2441888 There have been a couple of occasions where I have sawed the outer casing off a SMPS plugpack and rewired the input and outpu...
by LukeW
Mon May 21, 2012 5:47 pm
Forum: Module Discussion
Topic: Ndrive driver module, PWM, FET open circuit
Replies: 7
Views: 6751

Re: Ndrive driver module, PWM, FET open circuit

There are a few things I would try here: - Put a diode (eg. 1N4004) across the drain and source of the FET. The cathode connects to the drain side and the anode connects to the source side, so the diode is normally reverse biased. - Put a small resistor (10 ohms give or take) in series between the g...
by LukeW
Fri May 18, 2012 4:26 pm
Forum: LCDK: LCD & Keypad Shield
Topic: Netduino and 3.3V analog pins
Replies: 2
Views: 3934

Re: Netduino and 3.3V analog pins

You could cut the track between R6 (the resistor near the +3.3V Arduino shield pin) and the +5V pin and use a little bit of wire or something to bridge it across to the +3.3V pin. That should work. However, I've got to say, strictly speaking, it's not Freetronics' fault that some pseudo-Arduino prod...
by LukeW
Mon May 14, 2012 3:45 am
Forum: EtherMega
Topic: EtherMega SPI
Replies: 1
Views: 2427

Re: EtherMega SPI

Technically, yes, the different SPI devices on the bus are communicated with "one at a time". However, since there is some internal memory in the microcontroller, and you can switch between SPI devices at "digital speeds" which are much faster than "human speeds", you can use both the Ethernet inter...
by LukeW
Mon May 14, 2012 3:41 am
Forum: EtherMega
Topic: can't read design files?
Replies: 3
Views: 2852

Re: can't read design files?

When working with files like this on GitHub, it's best to do the following: - In your web browser, click on the link within the gitHub repository to take you to the GitHub page for that particular file (eg. EtherMega.brd or .sch or whatever one it is). - Now click on the button that says "Raw" in th...
by LukeW
Sun May 13, 2012 3:21 pm
Forum: SuperHouseTV Home Automation
Topic: Ep 3: Power-over-Ethernet for Arduino Home Automation
Replies: 7
Views: 8529

Re: Ep 3: Power-over-Ethernet for Arduino Home Automation

Instead of cutting up protoshield PCBs with a Dremel all the time, this is just begging for a custom PCB design, isn't it Jon? Perhaps a custom shield for the EtherTen with a box header which connects to an IDC ribbon cable (let's say 16 pins for example, depending on exactly how many wires you need...
by LukeW
Mon May 07, 2012 1:49 pm
Forum: SuperHouseTV Home Automation
Topic: Lighting control 12v switching vs 240v switching
Replies: 12
Views: 19712

Re: Lighting control 12v switching vs 240v switching

power supplies to the feed relays that drive the LED lights. Personally, I'd be very tempted to choose an appropriate power semiconductor device like a MOSFET to switch the low-voltage DC to the LEDs on and off. I don't like using relays unless there is no cost-effective semiconductor option that c...
by LukeW
Tue Apr 10, 2012 7:12 pm
Forum: Random Chit-Chat
Topic: A makefile for your Eagle projects
Replies: 2
Views: 3558

Re: A makefile for your Eagle projects

Thanks, Jon. It's still not perfectly workable and user friendly and stable as I would like, and it needs some more finishing. And unix scripting like this is not something I have much experience with. If anyone would like to try testing, or making any improvements, or making any suggestions or comm...
by LukeW
Mon Apr 09, 2012 7:03 pm
Forum: Random Chit-Chat
Topic: A makefile for your Eagle projects
Replies: 2
Views: 3558

A makefile for your Eagle projects

Here's a little project I've been working on over Easter, because I was a little bored, and I'm lazy and often get sick of generating and re-generating Gerber CAM files from my Eagle PCB layouts and generating preview images using gerbv. So I decided to write some code to automate the process. https...