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16  Using Arduino / General Electronics / Re: 5v relay on a nano. Why isn't it switching on: September 12, 2014, 08:08:00 am
Close but not quite. Try this link:

http://pighixxx.com/PNG/156.png
17  Using Arduino / LEDs and Multiplexing / Re: U can randomiz program selection 4 consecutive pins but can u 4 nonconsecutive? on: September 12, 2014, 06:56:25 am
It sounds like you need to take a look at arrays.
18  Using Arduino / General Electronics / Re: 5v relay on a nano. Why isn't it switching on: September 12, 2014, 06:35:26 am
http://www.pighixxx.com/else/
19  Using Arduino / General Electronics / Re: 5v relay on a nano. Why isn't it switching on: September 12, 2014, 06:24:42 am
Nominal current for that relay is 80mA. How much can you draw from one pin on a Nano? The Uno is 40mA MAX.

You should be using a transistor to drive the relay.
20  Using Arduino / Networking, Protocols, and Devices / Re: Sending SMS using sim 900 and Uno on: September 11, 2014, 03:06:01 am
First of all, are you using a SIM900 mounted on a shield? If so, can you provide a link?

Does it connect to the network? If you are using delay() it's common to allow about 20 seconds after the SoftwareSerial.begin to allow connection, handshaking, etc.

Once you have established that it does indeed connect, and if it still doesn't work, put a Serial.println() after each AT command to see if that gives you annyclues as to where the problem lies.
21  Using Arduino / Project Guidance / Re: Power Supply on Arduino Uno and GSM on: September 11, 2014, 02:20:40 am
Quote
Thanks for the reply, I know that the Arduino Uno got the voltage regulator built-in. Then any voltage between 7-12V will be regulated to 5V, is it correct?

That is correct.

Quote
Also, if I put in a squarewave to the analogue pin. Should I connect the wire on top of the GSM Shield? Because the shield is already on top of the Arduino.


Again, that is correct. The pins on the top shield connect to the ones on the bottom.

Quote
And I wonder if you can help me with the programming?

That's something we can help you with. Post your code, in code tags (use the '#' key). It might receive more attention if you start a new topic in the Programming section though.
22  Using Arduino / Networking, Protocols, and Devices / Re: unambiguously softstart SEEED GPRS shield on: September 10, 2014, 01:52:13 pm
Nope, it's a toggle.
23  Using Arduino / Sensors / Re: webcam instead of laser sensor on: September 10, 2014, 09:59:58 am
How big are the pictures and where are you going to store them during the comparison process? And then how long will the whole process take?

It's not impossible but is the sort of thing you would attempt as an exercise. The Arduino is a microcontroller, not microprocessor. Image manipulation is not it's forté!

Stick with the laser, much, much simpler!
24  Using Arduino / Project Guidance / Re: random generator on: September 10, 2014, 09:14:38 am
As soon as I see something like this I think 'array'!

Set up an array containing the output pin numbers, and then when you have selected your random number, turn that pin in the array element high?

You might also want to test your switch input has changed states, not simply is HIGH. Has it gone from LOW to HIGH, if so then process...
25  Using Arduino / Project Guidance / Re: Power Supply on Arduino Uno and GSM on: September 10, 2014, 07:58:54 am
As long as you are connecting the 9 volts to the Arduino through the barrel socket, and thence the voltage regulator, no harm will come to either component. The arduino is a 5 volt device too.
26  Using Arduino / Displays / Re: lcd clear statement newbie problem on: September 10, 2014, 02:55:07 am
Position cursor where you want to display voltage value. Print spaces to blank out the existing data. Reposition cursor in the same position and display voltage value. No need to clear display.

In future please use code tags - see the sticky on 'How to use this forum' at the top of the page.
27  Using Arduino / Networking, Protocols, and Devices / Re: Scan network using Ethernet Shield on: September 09, 2014, 08:43:19 am
If the project is worth doing, suck it up and buy the right hardware. If not, move on.

That should be at the top of the first page of the forum.
28  Using Arduino / Programming Questions / Re: Makey Makey, problem with source code on: September 08, 2014, 04:16:53 pm
Code:
makey_makey_1_4_1.ino:48:22: error: settings.h: No such file or directory

First line looks like the culprit?
29  Using Arduino / Programming Questions / Re: Makey Makey, problem with source code on: September 08, 2014, 03:28:25 pm
Now would you please edit your posts and put code tags (use the # button, twelfth icon across on the second row) around your code to get rid of the smileys and italics? This is what PaulS meant about not reading the information given in the post on how to use the forum.
30  Using Arduino / General Electronics / Re: Making PCA on: September 08, 2014, 06:06:00 am

Good question. I assumed nobody would want 1-10 small boards fully assembled. The setup cost would be ridiculous.


Me too, but the OP says 'made up' which did make me wonder.
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