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1111  Using Arduino / Networking, Protocols, and Devices / Re: Mini Pro + RFM12 + JeeLabs -> How to configure SPI/ on: July 27, 2013, 07:18:36 am
Never used JeeLab so not sure if you need to configure to suit a pro mini but this schematic shows the SCK, MISO & MOSI to be on different pins to the connections you show.
1112  Using Arduino / Sensors / Re: Impact testing using Arduino Uno on: July 24, 2013, 06:31:34 am
it would vary from a mass of a typical forklift going 10 m/s to a trolly going around the same speed (10 m/s)
That's big masses and speeds, not sure how you would go about that. Was you going to make stand alone arduino data loggers to strap to the impactor and target.
1113  Community / Exhibition / Gallery / Re: Automatic Street Lightning on: July 23, 2013, 06:21:43 am
Hi Riva,

Thanks for the suggestion. I have never worked with atTiny would try it out. Price wise there wasn't much difference thats why I didn't started with that.
It depends where and in what quantities you need but them but Mouser price the tiny less than half that of the mega328. Add to this the reduced PCB size needed for the tiny and you could save even more money & time. Using internal clock will also reduce costs as your 2x capacitors and 1x crystal better off.

I didn't knew you can work with the internal clock only. Are there any disadn. of using internal clock versus crystal impl. ?
The internal clock may not be as accurate as a crystal but for timings of a few seconds/minutes it may not drift to much.
Can we use its internal clock like a RTC ? I think removing external crystal will really simplify the circuit/soldering stuff.
How long a duration are you trying to measure? I would not even use a crystal controlled arduino as an RTC to measure more than a few minutes as clock speed will vary with temperature. Also loss of power will mean clock needs setting again.
1114  Using Arduino / Installation & Troubleshooting / Re: Arduino IDE verify speed much better in Ubuntu than Win7 on: July 23, 2013, 06:05:13 am
I'm using Microsoft Security Essentials  and Rapport. I've turned off MSE real time protection, but it makes no difference. I've enabled verbose output in compilation and noticed that all files are created in Temp/. Is this a standard default setting? All object files are being created every time??
I remember reading in another thread that Rapport was the culprit.
1115  Using Arduino / Project Guidance / Re: Measuring Force and Displacement with arduino on: July 23, 2013, 05:17:03 am
Cheap and accurate would be as AWOL suggests, maybe something like this It will interface to an external display so you would need to determine the connection/protocol to interface to your arduino but this article may help.
1116  Using Arduino / Sensors / Re: Impact testing using Arduino Uno on: July 23, 2013, 04:02:31 am
What is the mass/speed of the impactor?
1117  Using Arduino / Project Guidance / Re: Measuring Force and Displacement with arduino on: July 23, 2013, 03:59:22 am
This would depend on how large/powerful the springs are and the distance of travel but you could maybe use a simple stepper motor or motor/encoder combination and control/count the number of turns on a threaded bar. It would need something like a micro-switch to act as a home/reference indicator so you know where your starting from.
1118  Using Arduino / Programming Questions / Re: Trouble with reading a sensor and DS1307 RTC chip on: July 22, 2013, 06:35:31 am
This library has a getFormatted & getFormatted2K command that returns the date & time formatted into a single char array.
1119  Using Arduino / Project Guidance / Re: panning timelapse head - 2 axis on: July 22, 2013, 01:36:27 am
I need to know if the motor will be able to hold the weight of the camera tilting on the spec sheet it gives the holding torque at 39.2Nm but that doesn't really mean much to me so I'll just try it.. once I've got everything running I'll set about fabricating the head  smiley
If you can balance the camera so it's centre of gravity is inline with the rotation axis then the weight problem pretty much goes away. We use cameras weighing 5Kg or more being panned/tilted by a small 12V DC motors about half the size of a 330ml cola can.

EDIT: I found an image of the above device, as you can see I have highlighted the 12V pan & tilt motors. They are geared with just 2 cogs (motor shaft to camera platform shaft) and can pan/tilt a camera weighing upto 22.6kg
1120  Using Arduino / Microcontrollers / Re: How fast does an UNO starts after getting power? on: July 19, 2013, 02:31:12 am
I just finished a little ATtiny85 RF door opener project and my power switch is a momentary push button. Pressing the button powers the tiny and sends the RF signal to open the door. It takes less than 2 seconds to boot up, transmit the signal several times and the door start to open.
1121  Using Arduino / Programming Questions / Re: separate the numbers on: July 18, 2013, 12:06:04 pm
Assuming the number is decimal (base 10)
b = a / 10;
c = a % 10;
1122  Using Arduino / Displays / Re: 2.4" LCD working on UNO, not on Sparkfun Mega Pro on: July 18, 2013, 12:00:04 pm
Did you use the same test program and does it say it works with the Mega processor? The shield pinouts may be the same as an UNO but the way they are connected to the microprocessor will most likely be different. If the libraries are hard coded to use arduino ports and pins it wont necessarily work for a mega without modification.
1123  Using Arduino / Sensors / Re: Fluctuating analog output on: July 18, 2013, 02:08:44 am
How about a rolling average?
reading = (reading + analogRead(Ax)) /2;
1124  Using Arduino / Project Guidance / Re: Best 2/3G GSM (even USB) modem? So I can fake IMEI ,etc? on: July 18, 2013, 01:53:09 am
As Ufoguy says your not likely to get much help here because of the legal issues and also (from my standpoint) the moral issues. 
1125  Using Arduino / Project Guidance / Re: How to revert to a standard ID number? on: July 17, 2013, 05:40:17 am
Could you have a serial number for the board as well as the ID. If the ID is forgotten then sending serial number plus some other magic numbers will reset device back to default ID.
Another idea would be a universal broadcast message that makes any node hearing it respond with it's ID. Not sure how you then work out what node is what if you have many in range.
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