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406  Using Arduino / LEDs and Multiplexing / Re: Controlling IC1903 strip with arduino on: March 27, 2012, 05:57:01 pm
would be good to have a look at these, they are pretty damn cheap on ebay from china smiley
407  Using Arduino / Displays / Re: SPLC780D or S6A0069 LCD'S compatible with HD44780? on: March 26, 2012, 05:18:55 pm
ok thanks for the help Don  smiley
408  Using Arduino / Displays / Re: SPLC780D or S6A0069 LCD'S compatible with HD44780? on: March 25, 2012, 06:52:51 pm
Thanks Don, which of the two would you say would be nearest to compatible with the HD44780 controllers?

409  Using Arduino / Displays / SPLC780D or S6A0069 LCD'S compatible with HD44780? on: March 24, 2012, 09:06:11 pm
Hi all, I have made a project using a HD44780 20x4 LCD display and now need some more. I can find some using SPLC780D & S6A0069 but not sure if they will be drop in replacements?

Thanks in advance
410  Using Arduino / Project Guidance / Re: Arduino project using mains voltage (240v) on: March 24, 2012, 07:56:56 am
Anyone?
411  Using Arduino / Project Guidance / Re: Arduino project using mains voltage (240v) on: March 23, 2012, 06:29:13 pm
Thanks lefty thats great. One more thing I have just thought of, would you have the ground plane (arduino connected) anywhere near the mains stuff? I was going to add a full board plane but I'm not so sure, although it wouldn't be too much of a problem if it picked up mains noise would it? Or would it effect analogue readings?

Thanks again
412  Using Arduino / Project Guidance / Re: Arduino project using mains voltage (240v) on: March 23, 2012, 12:08:40 pm
sorry if I did not make myself clear, I have a habit of doing that  smiley-roll-sweat

basically then I should just connect the mains ground to the metal box that will be flush mounted in the wall (as you would normally in any socket) and terminate it there? I'm using a PCB mounted transformer & rectifier so I will obviously just connect the arduino gnd to the gnd output of the rectifier.

Thanks all
413  Using Arduino / Project Guidance / Arduino project using mains voltage (240v) on: March 23, 2012, 09:45:48 am
Hi all, I am currently working on a project which will control my central heating. I am using an arduino and a relay to switch 240v. The project will be powered via a transformer from the 240v feed from the boiler. I'm wondering if I should connect the arduino ground up to the earth on the mains feed?
414  Using Arduino / Project Guidance / Re: Arduino Thermometer on: March 19, 2012, 09:19:38 am
what type of temperature sensor will you be using?

the wifi looks like spi so you had better look at some tutorials smiley
415  Using Arduino / Project Guidance / Re: Industrial use on: March 16, 2012, 06:45:45 pm
i made a test rig for hall sensors using an arduino for work, saves a lot of time smiley
416  Using Arduino / General Electronics / Re: using a digitalpin to check for 5v on a wire on: March 13, 2012, 07:42:11 am
Simply connect the wire that you want to measure to a digital pin, and the grounds together. The you can do a digital.read. You may need to pull it low when the line is low but that depends on the source of the signal you are trying to measure?
417  Using Arduino / General Electronics / Re: best to measure resistance or voltage over distances? on: March 13, 2012, 07:38:30 am
Hi Mark. I did wonder about radio interference etc. How would I choose a value of cap, would it be polarized or not?

Thanks!
418  Using Arduino / General Electronics / Re: best to measure resistance or voltage over distances? on: March 12, 2012, 09:51:17 am
Thank you all for the input, I think I will go with the two wire option then smiley
419  Using Arduino / Installation & Troubleshooting / Re: Arduino Nano - avrdude: stk500_getsync(): not in sync: resp=0x00 on: March 12, 2012, 09:47:19 am
I had issues like this but in the end it turned out to be the USB cable. you probably have but if you have not, id suggest trying a different one.
420  Using Arduino / General Electronics / best to measure resistance or voltage over distances? on: March 09, 2012, 10:15:02 pm
Hi all, I am running a few 10k thermistors around. The longest away will probably be about 10-15 meters, I'm using cat5e so at least they will be twisted.

I'm measuring them with the arduino, and using the onboard 5v output for the divider circuits. I have got plenty of thermistors around and pinpoint accuracy is not really a necessity, so I'm not using digital temperature sensors at this stage. But id still like to keep it as accurate as possible with the components that I'm using smiley

I think I have got two options, not sure which would be the best..
  • set up voltage divider at the location of the thermistor, 3 wires (two for power and one for variable voltage output) and measure the return voltage
  • set up voltage divider at the location of the arduino, use just two wires (connected to the thermistor) and measure the resistance
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