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16  Using Arduino / Displays / Re: Arduino Nano + 7 Segment Display on: October 25, 2012, 12:48:18 pm
Thanks for the help smiley

Would it be possible to use this buffer instead?

http://proto-pic.co.uk/darlington-driver-8-channel-uln2803-dip/
17  Using Arduino / Displays / Re: Arduino Nano + 7 Segment Display on: October 25, 2012, 12:25:25 pm
Yes, you will need 180 to 220 ohm current limit resistors, 1 for each segment.
You will need 100nF caps, one for each shift register's Vcc pin.
You will need a ULN2003 to buffer the common cathode signals - each cathode will have up to 160mA flowing thru it if all 8 segments are on.
The shift register, or arduino pin, will source current into the anode segments, the ULN2003 will sink current.

So thats about 13 resistors then? Is this the buffer I am looking for?

http://uk.rs-online.com/web/p/darlington-transistors/4368451/
18  Using Arduino / Displays / Re: Arduino Nano + 7 Segment Display on: October 25, 2012, 12:03:44 pm
The 74HC595 is the standard choice for that sort of application.

Thanks. When connecting both the display and shift register to the breadboard / arduino will I need any resistors or other components?
19  Using Arduino / Displays / Re: Arduino Nano + 7 Segment Display on: October 25, 2012, 11:42:13 am
The accelerometer I'd like to use is http://proto-pic.co.uk/triple-axis-accelerometer-breakout-mma7361/. I think it'll be I2C...

Does it matter which shift register I use?
20  Using Arduino / Displays / Re: Arduino Nano + 7 Segment Display on: October 25, 2012, 11:03:34 am
Thanks. I take it that they run off digital pins?

I also need to connect an accelerometer to the arduino nano, would I have enough pins left?



21  Using Arduino / Displays / Arduino Nano + 7 Segment Display on: October 25, 2012, 10:30:04 am
I would like to use a 4 digit 7 segment display for a project at university and we have been given an arduino nano.

Using the display in the link below would it be possible to connect this to the arduino nano and how many of the pins would it take up?

https://www.sparkfun.com/products/11408
22  Using Arduino / Project Guidance / Re: Digital Protractor on: October 25, 2012, 05:12:50 am
I don't know about best, but I've used Proto-Pic a few times.

http://proto-pic.co.uk/triple-axis-accelerometer-breakout-mma7361/

Thanks. Will that breakout board work with the arduino nano?
23  Using Arduino / Project Guidance / Re: Digital Protractor on: October 25, 2012, 05:03:57 am
Ok, thanks. The accelerometer wasn't on the list of sensors that they had available at the university, therefore we would have to purchase one.

What accelerometer's are generally used with the arduino boards? and do you have to purchase any additional components to be able to connect them?

How would the force gauge work?

Try this:

https://www.sparkfun.com/products/9652

There is nothing else you need. It needs to be powered by the Arduino 3.3V voltage pin. It used to be $30 I think.

Wheres the best place to get one of this from, if you live in the UK?
24  Using Arduino / Project Guidance / Re: Digital Protractor on: October 24, 2012, 11:16:41 am
Ok, thanks. The accelerometer wasn't on the list of sensors that they had available at the university, therefore we would have to purchase one.

What accelerometer's are generally used with the arduino boards? and do you have to purchase any additional components to be able to connect them?

How would the force gauge work?
25  Using Arduino / Project Guidance / Digital Protractor on: October 24, 2012, 11:06:47 am
I'm thinking about building a digital protractor (i.e. inclinometer) for my college project and wondered if it would be possible to achieve this without the use of a gyroscope or an accelerometer, therefore using only a tilt switch?



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