Search found 106 matches

by cef
Fri Sep 13, 2013 5:50 am
Forum: Shield Discussion
Topic: RELAY8 8-Channel Relay Driver Shield
Replies: 1
Views: 5051

Re: RELAY8 8-Channel Relay Driver Shield

First off, each light on that tripod draws 500W, so you would need a relay that will handle around 2.5A at 250V on the switching side to switch each individual light on/off. If you're controlling both at once, that would need to be 5A switch at once. BTW: I've suggested 2.5A to allow for the fact th...
by cef
Mon Aug 26, 2013 4:00 am
Forum: LeoStick
Topic: Battery options and USB-PWR
Replies: 1
Views: 2913

Re: Battery options and USB-PWR

Hi noisymime, The USB-PWR jumper only removes power from one side of the AVR, however some other pins (the ones for the USB port) are still connected to the USB. This is so that the Leostick uses the USB voltages for USB communication, even if the AVR itself is powered by other means. I think that t...
by cef
Sun Aug 11, 2013 5:37 am
Forum: Eleven
Topic: Traffic Light
Replies: 6
Views: 5988

Re: Traffic Light

I'm no master of Arduino code, but the first thing that I notice is that in each sequences you've set up, there is no delay in the sequences when doing Green/Amber/Red and Red/Amber/Green. In essence (for Red/Amber/Green), you'll go in red, come out green, and you will not see the amber. You probabl...
by cef
Wed Jul 10, 2013 4:49 am
Forum: Module Discussion
Topic: Have I fried my N-drive MOSFET?
Replies: 3
Views: 4402

Re: Have I fried my N-drive MOSFET?

Ok, if it's stuck always on, then that's a different sort of issue. First off, confirm that there is a resistor between the Gate and Source on the board. It should be 10K (if you're going to measure it, disconnect the N-Drive from your circuit first) and is labelled R2. If this is missing, you may f...
by cef
Mon Jul 08, 2013 1:56 am
Forum: Module Discussion
Topic: Have I fried my N-drive MOSFET?
Replies: 3
Views: 4402

Re: Have I fried my N-drive MOSFET?

Firstly, you shouldn't have killed it. The MOSFET itself should turn on when the voltage at it's gate is somewhere between the minimum and maximum gate threshold voltage. That means you need between 1.5V and 2.5V at the gate on the MOSFET to switch it from the off to on state (and less when you want...
by cef
Tue Apr 30, 2013 9:57 pm
Forum: Dot Matrix Display
Topic: new to DMD
Replies: 5
Views: 5784

Re: new to DMD

As mentioned, for switch inputs, you're better with pull-up/pull-down resistors that tie it to the default you want. In the case of pull-up's, there are options to tell the inputs to internally pull-up the line, but these can prove to be an issue if you're using long lead lengths to your input, due ...
by cef
Mon Apr 15, 2013 10:55 pm
Forum: EtherMega
Topic: A little help?
Replies: 2
Views: 2727

Re: A little help?

Freetronics have put on a few more people to help answer questions so that Jon and Marc can concentrate on the business. I'll bring this up with Jon and see what we can do. Sorry about the delay. Things have been a bit hectic since your conversation on the forum with Marc. PS: Can you PM me your det...
by cef
Tue Apr 02, 2013 8:33 pm
Forum: SH-RFIDLOCK: RFID Lock Shield
Topic: Multiple RFID Shields on Etherten
Replies: 5
Views: 8182

Re: Multiple RFID Shields on Etherten

Main issue with this sort of thing (decentralised readers) is the length of cable between the RFID reader and the host processor. You can usually drive a strike from some distance, but the RFID reader definitely has a limit on how far it can be from the host (it's serial comms @ 5V).
by cef
Tue Apr 02, 2013 2:44 am
Forum: LeoStick
Topic: Keyboard and Mouse HID
Replies: 12
Views: 10564

Re: Keyboard and Mouse HID

I thought you uploaded them into another thread, but I couldn't find them at the time.

Thanks for the link efry!
by cef
Tue Apr 02, 2013 12:52 am
Forum: SH-RFIDLOCK: RFID Lock Shield
Topic: Multiple RFID Shields on Etherten
Replies: 5
Views: 8182

Re: Multiple RFID Shields on Etherten

That's probably the easiest way. You could make something up where you have only one reader but more than one relay (eg: you scan the RFID and it opens multiple locks via individual relays), but that's getting more complex, especially if you're new to Arduino. You most likely wouldn't use the shield...