Search found 106 matches

by cef
Mon Jun 11, 2012 2:03 am
Forum: Module Discussion
Topic: MIC issue - getting rogue high levels in quiet room
Replies: 3
Views: 3424

Re: MIC issue - getting rogue high levels in quiet room

I've found I have a lot of issues with crap USB cables with my Arduino, or even with a few USB to Serial converters I have.

As such, I now only use USB cables that have a ferrite bead on them. This seems to remove the issues I've seen. Might help in your case too.
by cef
Mon Jun 04, 2012 12:48 pm
Forum: Random Chit-Chat
Topic: I had an idea on the weekend.
Replies: 14
Views: 13031

Re: I had an idea on the weekend.

I think I'm getting this now. I just wasn't thinking outside my box. If I was to hack my headphones by securing it so the volume + button is always depressed then isolate the microphone wire/ground wire, cut it somewhere betwen the jack and the volume switch and place those two wires between this r...
by cef
Tue May 29, 2012 1:32 am
Forum: Random Chit-Chat
Topic: I had an idea on the weekend.
Replies: 14
Views: 13031

Re: I had an idea on the weekend.

If you can get precise degree turns out of the servo, it will be most likely be cheaper. I haven't played with servos, so I can't comment more than that. You can gear down a stepper motor to get more torque (and therefore spin larger objects), without needing larger (and more expensive) stepper moto...
by cef
Mon May 28, 2012 1:35 am
Forum: Random Chit-Chat
Topic: I had an idea on the weekend.
Replies: 14
Views: 13031

Re: I had an idea on the weekend.

Another option is using a combination of an Android phone (something with Android 4.0/ICS is prob best) and something like the USBDroid to completely automate the whole process. Press a button on the phone, it tells the Arduino to move the stepper X degrees, wait a set amount for the spinning to fin...
by cef
Sun May 27, 2012 7:48 am
Forum: Dot Matrix Display
Topic: Inadvertantly connected 3 DMD's to 12v 5A- Fixable?
Replies: 5
Views: 5199

Re: Inadvertantly connected 3 DMD's to 12v 5A- Fixable?

Which 5V rail on the PSU are you using? Most ATX PSU's have a +5V Standby rail (which is low current - usually called +5VSB) and a few 5V high current rails (usually just called +5VDC). Also, most PSU's need to be told to 'turn on' (jumpering the PS_ON Ground/Common is all that's required), otherwis...
by cef
Mon May 21, 2012 10:20 am
Forum: Module Discussion
Topic: Ndrive driver module, PWM, FET open circuit
Replies: 7
Views: 7580

Re: Ndrive driver module, PWM, FET open circuit

Since you're driving an inductive load, you might want to put a reversed bias diode across the FET to protect it from back EMF.

Something like a 1N4004 should be fine.
by cef
Thu May 17, 2012 9:51 pm
Forum: ES: Ethernet Shield
Topic: PoE+ (802.3at) Support?
Replies: 4
Views: 10123

Re: PoE+ (802.3at) Support?

Hi anas_ali, Simply put, if you buy any ethernet shield without a PoE regulator, then you will not be able to power the shield/arduino over the ethernet cable, and will have to power it via other means (eg: usb, via the power connector on the arduino, etc). With something like the Freetronics Ethern...
by cef
Sun May 13, 2012 1:11 pm
Forum: EtherTen
Topic: SPI problem with Thermocouple Shield
Replies: 4
Views: 7177

Re: SPI problem with Thermocouple Shield

Something of note here: One of the 3D printer electronics designs (RAMPS) allows for the use of an SD card and a Max 6675 on the same SPI interface. I haven't looked at any of the actual code in use for it (Marlin or Sprinter firmware specifically). Might also be worth a look thru that code if you'r...
by cef
Wed Apr 18, 2012 12:39 am
Forum: SuperHouseTV Home Automation
Topic: Lighting control 12v switching vs 240v switching
Replies: 12
Views: 23299

Re: Lighting control 12v switching vs 240v switching

If you can use DC, remember that some PSU's (such as most ATX PC supplies) have remote power-on and a 'stand-by' 5V. You could use the stand-by 5V to drive the Arduino side, and then have the Arduino switch the PSU on/off as needed. If you group the lights efficiently so that they're all in one room...
by cef
Mon Apr 16, 2012 12:37 am
Forum: EtherMega
Topic: crystal or resonator
Replies: 1
Views: 2329

Re: crystal or resonator

Does Ethermega use a crystal for the MPU or a resonator? The EtherMega has 3 crystals on the board. 1 x 25 Mhz for the Wiznet 5100 chip. 1 x 16 Mhz for the 8u2 (USB interface). 1 x 16 Mhz for the 2560 (the Mega). You can find a schematic at https://github.com/freetronics/EtherMega/raw/master/EtherM...