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121  Using Arduino / Project Guidance / Re: GPRS shield power and RTC on: June 10, 2014, 11:37:30 am
As to the power requirements, the SIM900 data sheet says 2 amps for 577uS (every 4.615mS) when transmitting. Figure 5 on page 22.

However, it does need to transmit just to remain in contact with the network, not only to transmit a text / sms.

I've not had a play with the clock so can't help you on that score I'm afraid.

122  Using Arduino / Networking, Protocols, and Devices / Re: Is receiving SMS messages in the UK free? on: June 09, 2014, 08:29:53 am
Why bother trying to do that? If a text costs 20p to send (and mine only cost 12p), sending one every quarter your initial top up will still last just over six years!
123  Using Arduino / Programming Questions / Re: arduino uno + sim900 linkspirit on: June 08, 2014, 10:13:17 am
Replace the two lines of your code with the following:


You are using the wrong quotation marks.
124  Using Arduino / Programming Questions / Re: Could some with Interrupt coding knowledge look over my project help me?? on: June 06, 2014, 10:47:56 am
Yes, and see if that makes a difference?
125  Using Arduino / Programming Questions / Re: Could some with Interrupt coding knowledge look over my project help me?? on: June 06, 2014, 10:39:22 am
I don't see the word Volatile in your code  smiley-wink
126  Using Arduino / Programming Questions / Re: Motor not spinning on: June 06, 2014, 09:51:51 am
Looks to me it's the red and black going out to the right, since the red is on digital pin 6 via the yellow.

That was my concern!
127  Using Arduino / Programming Questions / Re: Motor not spinning on: June 06, 2014, 09:37:10 am
Where's the motor?
128  Using Arduino / General Electronics / Re: Project Battery Drains Quickly on: June 06, 2014, 02:22:16 am
If by 9 volt battery you mean one of the small rectangular PP3 ones then you have no chance. Not only don't they have a lot of power you are immediately burning some of it off with the voltage regulator. And then you are running a motor off it?

Rechargeable single cell (AA, B, C, D)  batteries are 1.2 volts, so four of them will give you 4.8 volts. You could also consider one of the 'buck' converters to step the voltage up or down to 5 volts. I've not used one so can't offer any advice on that front.
129  Using Arduino / Programming Questions / Re: LED Traffic Light button not working Effectively on: June 03, 2014, 06:06:52 pm
Traffic lights? Have you tried the search box in the top right corner of the screen?

My project involved a T junction, and the lights would only trigger on a vehicle approaching on the minor road. But that was way back, when I was a student.
130  Community / Bar Sport / Re: How do you say? on: June 03, 2014, 03:41:41 pm
Not exactly the same, but it always amazes me the number of topics where the OP wants to take an inexpensive (or cheap clone) microcontroller, add a few peripherals and then, by the magic of software (which they cannot write otherwise it wouldn't be on the forum), they can replicate a device which costs hundreds or thousands of pounds / dollars.

Video editing is my favourite, followed by facial recognition!

Some seasoned developers have done very clever things with the Arduino, but well beyond the reach for the novice developers!
131  Using Arduino / Installation & Troubleshooting / Re: Arduino (uno) only works after uploading sketch. After reconnecting stops! on: June 02, 2014, 09:45:27 am
I have an Uno R2 with a similar affliction. Upload sketch, works fine, disconnect, reconnect and it's the bootloader blink that starts running. I changed processors in an attempt to fix it. After posting on here one of our mods drew my attention to a post detailing a modification to the board necessary to correct this.

However, I don't know if the OP has an R2 or not!
132  Using Arduino / Programming Questions / Re: How to correct "expected unqualified-id before 'if' and else on: May 30, 2014, 04:42:15 am
Please post all of your code. The culprit is probably several lines before that point.
133  Products / Arduino GSM Shield / Re: Arduino GSM Shield Sending SMS Messages not Working on: May 29, 2014, 09:41:37 am
Try sending your message to the international style telephone number of the receiving device.
134  Using Arduino / Project Guidance / Re: Dog Toy Dispenser on: May 28, 2014, 04:33:28 pm
I was thinking in broad terms of something like a snack vending machine, use a helix?
135  Community / Products and Services / Re: Arduino GPS Shield on: May 28, 2014, 04:15:00 pm
Why don't you contact itead directly instead of hoping they'll see your post on here?

And if you get resolution, please follow up your post?
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