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1  Community / Exhibition / Gallery / Re: Billie's Hydroponic Controller on: March 17, 2013, 04:19:07 am
Looks Really Cool. I tried to download the code but could not. I tried on a mac using safari, chrome, firefox and on windows using i.e.. All with save target or save file as, or download file as.
Is there anywhere else you can post the code?

Also your temp humidity problem should be easy to fix by turning the fans on and off a few degrees apart instead of using one set point.
ex

float SetpointTwo;

if (CurrentTemp > Setpoint)
{
   // Turn On Fans;
}

SetPointTwo = Setpoint - 3;

if (CurrentTemp < SetpointTwo)
{
//Turn Off Fans;
}

2  Using Arduino / Sensors / Re: 48v Golf Cart Battery meter help on: March 17, 2013, 03:40:10 am
Thank you for all the help. I ended up going with a ratio of 1/12 giving me 60v after checking the battery bank with a multimeter while it was charging, the highest it got to was 57. . I'm also using 10k and 100k resistors MarkT i checked my amazon order i did use a voltage converter . It is specifically made for 48v carts to have 12v for lights. I also mounted the voltage divider about 2 feet away from the arduino with only one small wiring carrying the 5v signal to the board. The glue gun has also been my best friend this project. Thanks for the tip for the fuse i totally forgot about that and will be picking one up in the morning.

One last question when you say " Adding a 100nF cap across the smaller resistor would
filter out noise from the motor controller and give more consistent ADC readings."

Do you mean like this?



3  Using Arduino / Sensors / Re: 48v Golf Cart Battery meter help on: March 13, 2013, 04:32:59 pm
Thanks.
I did not know that the higher the resistor the less current it would pull. thank you for that. I have about 2 days worth of electronics experience
I am looking at the resistors i have in my starter pack. I have 10k and 100k resistors, do you suggest i pick up even higher or will the current draw be low enough with those? I dont want to drain the battery with this thing.
4  Using Arduino / Sensors / 48v Golf Cart Battery meter help on: March 13, 2013, 02:44:59 pm
Hi everyone, Im currently building a golf cart computer for my dad (my first arduino project) and i want to add a battery meter to it. After doing some research on how to do it i ran across a blog explaining a voltage divider. I think i am correct on bulding the circuit but i am a little apprehensive to hook it up without a second opinion. I wanted to make a divider for a max voltage of 55v stepped down to 5v. Attached is a really bad diagram of my circuit any help, thoughts, or opinions would be greatly appreciated.

thanks in advance
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