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1  Using Arduino / Project Guidance / Re: Arduino RFID lock using new Uno and MFRC522 on: November 11, 2013, 07:46:36 am
2  Using Arduino / General Electronics / Re: question about GPS antenna on: July 22, 2013, 02:23:20 pm
hey Johnny,

I ordered 2 different antennas and one of them showed up today in the mail, I plugged it in and used "tiny GPS test" code from the "tiny gps library" and it worked almost instantly.  I had to change the baud rates to 9600 and moved the jumpers to 3,4 (TX,RX for the shield).

The antenna I used was:

I actually bought the one from ebay only because Robotshop was out of them at the time but I'm pretty sure there the same. I'm still waiting for the antenna like yours to arrive.
3  Using Arduino / General Electronics / Re: Beginning electronics book on: July 17, 2013, 11:47:34 am
for general electronics:
with accompanying blog:

for arduino:
author's website: (this is the newer edition, not out yet)
accompanying website:

4  Using Arduino / Project Guidance / Re: Simple LCD Menuing on: July 16, 2013, 07:28:28 pm
have a look at  exercise 9.2 w/video around the middle of the page.
5  Using Arduino / General Electronics / Re: reason for no on/off switch on arduino? on: July 15, 2013, 01:49:06 pm
thanks for the reply's  smiley-cool

I think I'll go the simple route and order the USB hub with individual power switches, and in the mean time I'll switch USB cables from my other port (only two are available for my laptop).  It's weird that it's not really a feature on any arduino boards though.

6  Using Arduino / General Electronics / reason for no on/off switch on arduino? on: July 15, 2013, 10:10:34 am
My USB port is starting to die on me from plugging/unplugging the USB cable all the time.  I was just wondering why there's no power switch on the arduino (or any clones that I've seen) so we could just switch it off and switch it back on after we've rewired something?

 I was looking at a USB hub that has power switches for each port which would eliminated this but wasn't sure if it would be harmful in any way?  Would this be fine?
7  Using Arduino / Project Guidance / Re: I need some online electronics providers on: July 10, 2013, 06:05:19 pm
This place doesn't have much of what your looking for but it's located in Ontario, Canada.  It's not free shipping but still pretty cheap.
8  Using Arduino / General Electronics / question about GPS antenna on: July 10, 2013, 05:40:37 pm
I'm currently trying to run an itead gps shield but I was wondering if someone can help out with some antenna advice?

the shield that I have is:

and the antenna that they carry in their store is:

so does this need to have a frequency?  I ask because I already have two antennas that came with some APC220 modules that look like they should fit but wasn't sure it they would fry my gps or not.

here's the link to the modules and datasheet:

thanks in advance!
9  Using Arduino / Programming Questions / Re: Ping sensor with if statement on: July 09, 2013, 12:52:39 pm
int pingPin = 3;

void setup()
leftmotor.attach(9); // af-motorshield servo 2
rightmotor.attach(10); // af-motorshield servo 1

are you using the adafruit shield?  if so pin 3 that your PING is connected to isn't available.
10  Using Arduino / Motors, Mechanics, and Power / Re: Motor Shield Power HELP!! on: July 02, 2013, 08:55:42 am
you haven't posted a link or anything for the motors your using, so I'm just assuming your using the yellow ones with the black tires.

4x1.2v will give you 4.8v total, it will be less than that once you run them through your shield but you still should be good. The good thing about the single AA batteries is if you did find that the volts dropped too much (around your minimum 3.5v) you can add another battery and switch to a 5AA holder(or less for other bots and stuff) without having to worry about a whole new battery pack for each different build.

I have 5 fully charged AA's(6 volts) hooked up to my adafruit shield and my multimeter is telling me that the batteries are 6.5 volts and the output of the shield where the motors are connected reads 4.92 volts (two motors at full speed running in the air), so it dropped around 1.5 volts, that's with fresh batteries so the output reading may change after running it for a short while. You'll need to try your own experiments.

The "23000mAh or greater" will determine how long you can run the motors before they drain to a point where you need to recharge them again, if you are running four motors the batteries will drain faster than a robot that uses two so look for batteries with high mAH, for the most part if your just turning on your bot for short periods of time you should shouldn't really have worry too much about them dying anyways.  You can always have two sets, one charges while you use the other if you needed to.  I mentioned the Energizer 23000mAh because that's what I use and they do the trick there may be something better?

ps: the mAh label is really small and on the top and side of the battery, not too sure if it's advertised on the package or not? so stay sharp smiley-grin
11  Using Arduino / Motors, Mechanics, and Power / Re: Motor Shield Power HELP!! on: July 01, 2013, 06:33:44 pm
Don't forget to remove the jumper from the shield if you want to use separate power supplies smiley-wink  you could always do some tests with a multimeter, wall wart/bread board and such to get a better idea of what to expect before you drop money on a battery pack, in the end your going to loose a little voltage from whatever batteries you choose after running through the shield (ie. 5 volts won't be 5 volts). A normal 9v battery should be good enough for just the arduino and a sensor.
12  Using Arduino / Project Guidance / Re: Arduino lcd pushbutton on: June 28, 2013, 10:58:10 am
another idea is you can use a potentiometer to scroll through a menu and have a button as an enter key.

check out exercise 9.2 w/video around the middle of the page.
13  Using Arduino / Project Guidance / Re: Separate Power Source for Relay Board? on: June 27, 2013, 01:28:42 pm
this might be of some help:
14  Community / Exhibition / Gallery / Re: My Arduino hexapod monster: Bajdupod 996R on: June 26, 2013, 11:50:41 am
pretty sweet, thanks for sharing!
15  Using Arduino / Networking, Protocols, and Devices / nRF24L01 motor shield/SPI compatability on: June 25, 2013, 03:22:01 pm

I was looking at purchasing a motor shield that has a nRF24L01 plug-in, but I noticed that the SPI pins to work the module are digital pins 2-6 as opposed to the 11-13 which according to the arduino SPI info webpage are "the pins the SPI lines are broken out on" (Uno or Duemilanove).

Will I have to do any modding of the SPI library to make this work or was everything designed to work fine right out of the box code wise?


here's the schematics etc below (sorry links didn't want to link up?):

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