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1  Using Arduino / LEDs and Multiplexing / Re: Where can I get 6" outdoor LED digits from? 12 volt preferably. on: January 19, 2014, 02:20:35 pm
Ok, thanks Robert for that. I've ordered up some diodes from China smiley. Is there a poss & negg way to fit them or do they go any way?
I have one curious question.. on the Arduino there are headers that we connect to.. what is the best way to make a robust connection? Would you solder from the other side or would I buy the headers that are available.. are they easier to solder to or do I use Brake Away Headers like this one and solder to the ends.. do these separate?
http://proto-pic.co.uk/break-away-headers-straight/

Warren
2  Using Arduino / LEDs and Multiplexing / Re: Where can I get 6" outdoor LED digits from? 12 volt preferably. on: January 19, 2014, 11:31:25 am
I think this one would do the job?
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=231104103029&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en

Would this reduce my 18v down to 5v for the Arduino?
Would I still need the diode?
Thanks, Warren
3  Using Arduino / LEDs and Multiplexing / Re: Where can I get 6" outdoor LED digits from? 12 volt preferably. on: January 19, 2014, 08:19:14 am
Sorry Robert, I should have put the link.. it was from a couple of previous comments above. It's this one http://proto-pic.co.uk/voltage-regulator-5v/
Quote
How about one of the modules from eBay?
Having a look at those now.. they look interesting.
4  Using Arduino / LEDs and Multiplexing / Re: Where can I get 6" outdoor LED digits from? 12 volt preferably. on: January 18, 2014, 05:16:15 pm
Hi Robert, I have been doing my research trying to learn about regulators and capacitors etc haha.. lots to learn!
I thought about the dual battery system and the regulator and I think the best way to go is the regulator for a couple of reasons.. cost and convenience.  smiley-lol
Ok, if I use the 5 volt regulator (link above) and connect my 18 volts in and 5 volts out. I will need a Diode Rectifier - (1A 50V IN4001) to go across + & -.. is that correct? Will I still need the diode if I use the regulator and one power source?
I came across someone attaching a couple of Tantalum Bead Capacitor 1uF 25V to the input and output.. is this necessary? I will of course be using a heatsink.
Thanks again for your help. smiley
5  Using Arduino / LEDs and Multiplexing / Re: Where can I get 6" outdoor LED digits from? 12 volt preferably. on: January 17, 2014, 06:07:21 am
Thanks Robert.. the last thing I would want is for it to overheat.  smiley-confuse
Might add an extra battery compartment for some AA's to run the Arduino at 4 x 1.5v = 6volts and let the 2 x 9v batteries run the digits.. or would that be wrong? Would I still need the diode with this set up? What type/size?
Cheers Warren
6  Using Arduino / LEDs and Multiplexing / Re: Where can I get 6" outdoor LED digits from? 12 volt preferably. on: January 16, 2014, 04:31:12 pm
Hi Robert, it's been a while and lots have gone on. We have recently moved house and financially I am now in a position to proceed further with the lap board. The 7 segment digit I started this topic with has now finally been sourced, purchased and delivered (x 6) including buttons, wire, perspex, carbon fibre sticker material.. everything!  smiley
Question: The digits need min 14.4v to run. The best option I came up with is 2 x 9v batteries to give 18 volts which run the segments perfect. I know if I try to run 18v into the Arduino it will not like it so would I be correct in saying a 5v regulator will do the step down for me?
This is the one I have been looking at on Sparkfun/Protopic;
http://proto-pic.co.uk/voltage-regulator-5v/
Regards & happy new year!!
Warren
7  Using Arduino / LEDs and Multiplexing / Re: Where can I get 6" outdoor LED digits from? 12 volt preferably. on: August 15, 2012, 08:47:00 am
That would be great. 100' in direct sunlight would do the job perfect. I'll have to get some ordered up and give them a try. I'll keep you informed of my next move. Won't be for a lot of weeks yet.. really busy with work n the racing at the minute, just finished the Ulster GP last week and now getting ready for our last meeting in 3 weeks.
Speak soon,
Warren
8  Using Arduino / LEDs and Multiplexing / Re: Where can I get 6" outdoor LED digits from? 12 volt preferably. on: July 26, 2012, 07:42:46 am
They look great Robert and I agree, they don't look like they would be too hard to put together.
How bright are they? Would they be suitable for outside in sunny weather like the gas price signs?
9  Using Arduino / LEDs and Multiplexing / Re: Where can I get 6" outdoor LED digits from? 12 volt preferably. on: July 25, 2012, 07:25:30 pm
Thanks for the replies.  smiley
I think the strip will cause too much work making segments etc.. possibly the best way forward is a gas/fuel sign 7 segment digit running 12 volts or something like that?
The vane displays are fantastic but way too pricey.. I looked into them before and even went to the bother of making an experimental electromagnet etc.. only to find that's not exactly how they work.. ah well, I had fun messing with them. Can't remember the price or even how they work but basically they were too expensive.
The image of the digit I used at the beginning of this thread is perfect for what I need, all the hard work is already done leaving me to simply connect and upload the programme. It's just the postage from China that's making me look a little closer to home.

I'm away for the weekend and will be back Sunday for any updates.
Warren
10  Using Arduino / LEDs and Multiplexing / Re: Where can I get 6" outdoor LED digits from? 12 volt preferably. on: July 24, 2012, 02:24:46 pm
Hi Robert, great to hear from you again. Yes the season is coming to an end in the next couple of months.. we have a race this weekend and then we get ready for the Ulster Grand Prix the week after then 1 more race 1 month later to finish.
I already have the Sparkfun 6.5 digits which worked great but were not bright enough for outdoor use.
Is the flexistrip high brightness? It says "Luminous Flux @ Test: 54lm".. is this bright enough for outside? I don't see any other reference to brightness.

Cheers
Warren
11  Using Arduino / LEDs and Multiplexing / Where can I get 6" outdoor LED digits from? 12 volt preferably. on: July 24, 2012, 10:01:27 am
Not sure if I am supposed to put up subjects like this here but at I have searched everywhere and can only find a supplier in China. The postage makes them almost double the price.
This is what I'm looking for.

Question:
Does anyone know where I can get these digits either here in the UK or anywhere else?
Many thanks in advance
Warren
12  Using Arduino / LEDs and Multiplexing / Re: Stopwatch with Pause/Lap 6 digit 7 seg LED. HELP! (from old forum) on: February 18, 2011, 07:15:05 am
Hi Robert, the following code is where the problem lay. I managed to write a memory clear but was still getting erratic saves?? the code below in 'memory write' didn't have the 'copy_' included for the last digit and was messing up every time it saved anything over 10 mins.
All working now. For some reason I only ordered 7 shift registers and not 8???  smiley-confuse so I need to order another so I can get the lap counter running.
I also managed to disable the memory down if it was below address 10.
if (EEPROM_address < 10){
    EEPROM_reading_down = 0;
That stopped it showing weird segment light up!? I may also putting a lap total read of 64 lap recalls. 8 digits x 64 = address 512. Although I might stop this at 60 laps.


Code;
=================================================
   break;      
  case 6: // tens_minutes
    //Serial.print ("Writing tens_minutes to ");
    //Serial.print (EEPROM_address, DEC);
    //Serial.print (" ");
    //Serial.println (copy_tens_minutes, DEC);
    EEPROM.write (EEPROM_address, copy_tens_minutes);
    byte_to_write = 1; // reset for next group
    EEPROM_address = EEPROM_address+1; // increment for next group
    if (EEPROM_address == 516){
      EEPROM_address = 0;
=================================================
13  Using Arduino / LEDs and Multiplexing / Re: Stopwatch with Pause/Lap 6 digit 7 seg LED. HELP! (from old forum) on: February 16, 2011, 09:12:47 am
Hi Robert, sorry for not being on with updates.. I've been flat out the past 2 weeks including a trip to England for 5 days!! Lol.
I have got some backing board to mount the numbers on instead of plywood (too heavy). Still looking for a good battery source and trying to decide if it should be internal or external???
Example: http://cgi.ebay.co.uk/YUASA-12-VOLT-2-3AH-ALARM-BATTERY-GENUINE-NP2-3-12-/140339745690?pt=UK_ConsumerElectronics_Batteries_SM&hash=item20ace6939a Would this battery suit, you mentioned about the power dropping bellow 11.?? something?
Well, my new Arduino Uno arrived and as suspected I had blown the other one!  smiley-eek Lesson learnt!
I got everything wired up and all is good. I even managed to successfully wire up the 'G' line for the dimmer and have it working when the pause button is pressed it goes to full brightness.
I need to do a little more experimenting but I think the memory saves differently each time depending on weather the time is reset from running or pause mode.???? Need to do some tests and write things down.
Other than the above I need to add a clear memory button and it would be good if memory down didn't go below lap1.. or the memory up didn't go above 99.
Then I need to add the lap counter to the memory.. should be easy enough..
I will keep you posted of all progress.  smiley
14  Using Arduino / LEDs and Multiplexing / Re: Stopwatch with Pause/Lap 6 digit 7 seg LED. HELP! (from old forum) on: February 06, 2011, 05:38:12 pm
I started with the first one and got it all wired ok using the same configuration as before which was handy.  smiley then I added another in series which didn't work at first until I connected the SRCK and the RCK to the second digit as well as the SERIN/SEROUT.
While I was wiring the third digit I managed to set my Arduino down on top of a pair of scissors which were on my desk.. now, nothing works.  smiley-cry..
After checking the wires and changing the digit, shift register and changing my USB cable with one connected to the other computer I have decided I need another Arduino! (Already ordered!)
While I'm waiting for it to come I will get the rest of the digits wired up.
15  Using Arduino / LEDs and Multiplexing / Re: Stopwatch with Pause/Lap 6 digit 7 seg LED. HELP! (from old forum) on: February 05, 2011, 10:28:44 am
Not yet Robert.. the post man/woman has just been and delivered 8 x Common Anode digits. These are the small ones so I can concentrate in getting them working first. I have 6 for the time and 2 for the laps.

I will report back later when I get a chance to wire a couple up along with the extra code for the lap counter.  smiley
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