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91  Using Arduino / LEDs and Multiplexing / Re: 8x8 Matrix LED problem on: May 16, 2012, 06:38:58 pm
watch me
92  Using Arduino / LEDs and Multiplexing / Re: transistor-driven LEDs circuit in a 5*5*5 LED cube on: May 16, 2012, 06:37:14 pm
Mike here is a nice video I found using that chip to source
I would try what pancake said. Drive one pin on the source hi and the uln2803 the  hi and see if you could manually turn them on. I really done see a issue with how you built the circuit. I don't have any source drivers to built it. I've used the uln2803 for all sorts of things.
Let us know what you find. I'm thinking about making a cube they are amazing to watch!
Good Luck
Don
93  Using Arduino / Installation & Troubleshooting / Re: relay card problem on: May 16, 2012, 06:13:44 pm
watch this video I was looking at some of his other videos and thought it would help you understand the 74hc595 latching and driving the outputs. If you watch the first part you will see why didn't build this board with the 164 shift register. The relays would chatter as data is shifted into the register. I hope that helps you good luck. Where did you purchase this board at?


Don
94  Using Arduino / Project Guidance / Re: Controlling home sprinkler system on: May 16, 2012, 06:02:25 pm
It's a triac google both part numbers and compare the voltage and current limits etc. You want to use this 6 pin chip to drive a larger current capable triac. http://static.electro-tech-online.com/imgcache/1167-electronique_triac_001e.gif you will not need Q1 since a Arduinio can drive a simple led.
Don
95  Using Arduino / Motors, Mechanics, and Power / computing mph for a weatherstation with opto (anemeter) on: May 12, 2012, 08:54:52 pm
Hi
I'm looking on some information on how compute miles per hour from a round disc that has 32 shaded area or slots using a photo transistor and led. I'm planning on using external interrupt on the Arduino to detect a shaded area on the disc.
Say I count how many pulses that have been count in 1 second.
Don
96  Using Arduino / Installation & Troubleshooting / Re: relay card problem on: May 12, 2012, 08:39:20 pm
on the relay board pin 4 goes to the 74hct95 pins 12 and 13. I think that after you send the shiftout command then you pulse pin 4 high then low. It has to be low to get the data to appear on the output to drive the relays. In your source I see a variable given but you don't use it in loop. You use data which I didn't see you define it. I'm kinda new to Arduino but have been using AVR Assembler for years.

http://www.nxp.com/documents/data_sheet/74HC_HCT595.pdf 

Here is some info from Nick he is using a 74hc595 with spi. but it has data on that chip.
You have to latch it into the and then enable the output to drive your relays.
Don
97  Using Arduino / Interfacing w/ Software on the Computer / Re: Problem by controlling application with Arduino! on: May 12, 2012, 07:55:01 pm
What your asking makes no sense after reading your post 3 times can you clarify the task you are trying to preform?
98  Using Arduino / Project Guidance / Re: Vehicle remote ignition - Some questions. on: May 12, 2012, 07:41:22 pm
most remote starter systems cheat and monitor voltage from the battery. When its 14.0 the car started alternator charging well at least here in the states.
99  Using Arduino / LEDs and Multiplexing / Re: transistor-driven LEDs circuit in a 5*5*5 LED cube on: May 12, 2012, 06:31:21 pm
Mike
What chip are the cathodes connected to ULN2803A? what is the forward voltage and current rating of your Leds?

Check this out http://4.bp.blogspot.com/-lTPdhKCwPUM/TcYu7VOOwBI/AAAAAAAAAHc/hoKKTGFarNM/s1600/atmega-matrix-display-circuit.GIF
Don
100  Using Arduino / Project Guidance / Re: Controlling home sprinkler system on: May 06, 2012, 04:27:47 pm
Since you are using 24volt AC a Traic would be needed and not a transistor. Traics are used to switch AC devices. Watch this video it has a circuit. I like the MOC3041 because it fully isolates the micro controller from the load. http://youtu.be/5tt4zAkpDPw
Don
101  Using Arduino / Programming Questions / Re: Question about writing or reading more that one pin at at time. on: January 16, 2012, 03:59:36 pm
Thanks AWOL
I saw "Shannon" but didn't read it all Shannon Member.
There is sure some give a take will Arduino where it is very easy to perform serial communitions. PWM, delays, etc. I have a JTAGICE mkii for debugging the avr. What do you use to debug the Ardunio I have been using serial.print for now. I have a module in my old logic analyzer that works with spi and ic2, 3 wire. I'm making a library to send data from the Arduino to logic analyzer using spi.
Don 
102  Using Arduino / Programming Questions / Re: Question about writing or reading more that one pin at at time. on: January 16, 2012, 03:42:42 pm
Thanks for your replies Shannon
So would I use the digitalWrite function to write data on LCD pins D4,D5,D6,D7 one at a time then strobe "E" high then low?
Don

103  Using Arduino / Programming Questions / Re: Question about writing or reading more that one pin at at time. on: January 16, 2012, 03:30:32 pm
I should have added that I have a parallel controller with a HD44780 controller. You need 6 pins to control it 4 for data and 1 for register select 1 for enable. I have a bunch of them. I don't have any serial modules.
Don
104  Using Arduino / Programming Questions / Question about writing or reading more that one pin at at time. on: January 16, 2012, 03:05:37 pm
Hi
I was wondering how to connect and communicate to a LCD Display in 4 bit mode.
I understand how to use digitalWrite() to control pins E and RS on the lcd module but how do I access 4 pins at once. In AVR Assembler I would mask the data and write it to a port say PORTB.
I'm new to Arduino and trying to learn more about it.
Thanks
Don
105  Using Arduino / Installation & Troubleshooting / Re: Upload error message Uno V3 Newbie on: December 30, 2011, 11:53:26 pm
I did the work around and now able to program my new Uno board. So I'm very happy to have my new Arduino Uno board working. Now to learn more about Arduino. Great to be a part of this forum.
Don
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