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46  Using Arduino / Programming Questions / Display battery state of charge graphic on LCD on: October 05, 2013, 06:34:50 pm
Hi all. I would like to display the state of charge of a 3 cell lipo pack on a lcd. I would like to use one of the lines to give me 16 steps of resolution, corresponding to a voltage range of 9.3-12.6v.

And I think i will need to map 9.3-12.6 to give a range of 0-16, then ideally I would like to make some custom chars, and have them display a image of a battery with both solid and empty sections. Reading a voltage is not a problem, and I can make custom characters.

The part I will need help with is how to code this up, would I have to use an array to display the chars?

An example would be when the voltage is  <9.3v, to display something similar to the following..
_________________
|________________|

hope that makes sense, thanks
47  Using Arduino / Project Guidance / Re: help with rc led light controller? on: October 02, 2013, 06:31:18 pm
its pretty incredible the prices for the cloned stuff. I picked up some pro mini's for about £2.60 each the other week!

If i had more spare cash I would buy more of the official stuff, shame it is so much more expensive!

Good luck on the project, did you check out the lane boys controller - it might give u a head start or some ideas?
48  Community / Website and Forum / Re: Arduino.cc reboot: feedback and comments on: October 02, 2013, 06:28:42 pm
I quite like the fresh new look but how can I view my posts? This is the method I use on all forums including the old arduino forum to check for replies, I see someone has posted a link above to show your posts but please add a button because I use this forum from many different machines so a bookmark won't really help?
49  Using Arduino / Project Guidance / Re: help with rc led light controller? on: October 01, 2013, 11:05:56 am
if you want to go for the cheap option look for clones on ebay, beware they tend to take a long time to arrive, sometimes they don't even arrive at all - but can be worth the gamble
50  Using Arduino / Project Guidance / Re: help with rc led light controller? on: October 01, 2013, 08:24:12 am
I would use a mini http://store.arduino.cc/eu/index.php?main_page=product_info&cPath=11_12&products_id=218

and yes that FTDI board will program the mini

Good luck!
51  Community / Exhibition / Gallery / Re: Multi-mode video display and keyboard interface on: October 01, 2013, 06:33:18 am
wow, very cool! thanks for sharing smiley
52  Using Arduino / Project Guidance / Re: help with rc led light controller? on: October 01, 2013, 04:51:41 am
Check this out, it may be helpful http://laneboysrc.blogspot.co.uk/2013/09/diy-rc-light-controller-update.html

If you want to make you own the arduino pro mini would be the smallest
53  Using Arduino / Project Guidance / Re: Lipo fuel gauge on: October 01, 2013, 04:45:07 am
could you try it first on a breakout board?
54  Using Arduino / Project Guidance / Re: Barn door mount project on: October 01, 2013, 04:42:23 am
Hi thanks for the advice smiley I now have one of those steppers you suggested on the way, I can start planning the other hardware in the meantime.

Thanks for the link also, I will have a good read of that later!

Hopefully I won't need to source and gears with the geared motor smiley

thanks again
55  Using Arduino / Project Guidance / Re: Tacking wires to PCB - How? on: September 28, 2013, 07:34:56 pm
conformal coating is also excellent for sealing the entire board once a project is "complete" and requires no further enhancement. it's ideal for ever-changing climates where the board is somewhat exposed to the elements of things like condensation within the cabin of a motor vehicle. a lot, if not all OEM's use these type of coatings on their ECU/ECM/PCM to prevent short circuits from things like moisture attacking the PCB, and it needs removed if one wishes to modify the board! very good products indeed.

Pretty much why we use it on our automotive products. The worst thing about it is trying to seal up the connectors when coating using spray. We tried many but found acrylic to be the easiest to use, you can solder through it and it just melts away and then apply more over the reworked area with the brush. It's also easy to remove using IPA in a ultrasonic bath.
56  Using Arduino / Project Guidance / Re: Tacking wires to PCB - How? on: September 26, 2013, 07:40:49 pm

I like the Acrylic too, how viscous is it?


It's hard to say, personally i think its perfect - small blobs don't spread too far, and the more you apply the further the spread. If that makes sense! I have used this method lots of times, we coat all our PCB's in acrylic conformal coating (same as the bottle but in aerosol format) but any reworks get protected with the bottled stuff first. I use it on loads of other projects for securing things - even seems to work well for strain relief on cables - I use a lot of ribbon cables that don't usually last long if moved about.

in the photo below you can just about see it on the kynar wire and the 0805 resistors on the back of the LCD module to the left

57  Using Arduino / Project Guidance / Re: Tacking wires to PCB - How? on: September 26, 2013, 10:41:06 am
http://uk.rs-online.com/web/p/conformal-coatings/3217324/

We always use the above to secure reworks to our PCB's. It seems to work well for securing fine wires and also SMD resistors if we only have one pad to solder to etc.
58  Using Arduino / Project Guidance / Re: Barn door mount project on: September 25, 2013, 07:36:10 pm
I don't know, a lot of the home made mounts I have seen have used steppers, but having never used one myself I'm not sure what to expect?

I'm not to worried about triggering the camera, will be easy to do with a couple of optocouplers.

I'd like to use a arduino to allow me to fix tracking errors in sofware so I don't have to build a double arm or curved rod type, I'm just looking into the hardware side of things at the moment and would like to know where I can gears / belts / pulleys and things like that to fit the basic stepper?
59  Using Arduino / Project Guidance / Barn door mount project on: September 25, 2013, 03:40:16 am
Hi all. I'm almost ready to start my next project, which will be a barn door mount controlled by Arduino. If you are not familiar with a barn door mount, it is basically a tracker to counteract the earth's rotation for astrophotography - http://en.wikipedia.org/wiki/Barn_door_tracker

I am still in the thinking stages, and I'm not sure if direct shaft drive or some kind of gearing would be better. I have a basic stepper motor to use https://www.sparkfun.com/products/9238, but I'm wondering where I can get gears and things like that to fit the shaft? I may also use a drive belt but I'm not sure where I could buy parts like that?

I'm in the UK so I would rather buy locally than wait for oversea's postage etc.

Thanks smiley
60  Using Arduino / Project Guidance / Arduino pro Mini on board regulator on: August 17, 2013, 07:41:03 pm
Hi all. I am using a pro mini in a project, and I'm wondering if anyone knows the spec of the onboard v reg? It doesn't seem to be listed on the schematic http://arduino.cc/en/uploads/Main/Arduino-Pro-Mini-schematic.pdf

It says that it can handle up to 12v, but I'd like to know if this is the absolute max, or I could go to 13-14v. Also would like to know the current output.

It would be good if I don't have to use an off-board reguator to power the project.

Thanks
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