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Search: Posts Made By: chrischrischris
Forum: General Electronics Chat 09-15-2013, 12:38 PM
Replies: 5
Views: 583
Posted By chrischrischris
Ok, that's makes more sense. However it doesn't...

Ok, that's makes more sense. However it doesn't equate then to frames (flicker) per second. 4 digits - 125 times per second - therefore each digit is on 1/4 of the time.

I've found that they...
Forum: General Electronics Chat 09-14-2013, 11:12 PM
Replies: 5
Views: 583
Posted By chrischrischris
Sorry, still not 100% sure... So the delay...

Sorry, still not 100% sure...

So the delay time for each you have as 2ms.
If 5 digits, then 1 loop = 5 x 2 =10ms.
I would assume this repeats continuously, so in 1 second it loops 1000/10 = 100...
Forum: General Electronics Chat 09-14-2013, 04:49 PM
Replies: 5
Views: 583
Posted By chrischrischris
Multiplexing via 7 seg display via Arduino board

Can someone please clear up a query I have on multiplexing. I've just spent a stack of time trying to learn to program an arduino to study the effect of:

When multiplexing 2 seven segment digits,...
Forum: General Electronics Chat 09-07-2013, 10:40 AM
Replies: 413
Views: 33,017
Posted By chrischrischris
PROJECT COMPLETED...:):):) On behalf of...

PROJECT COMPLETED...:):):)

On behalf of myself and Monbulk Rangers Soccer club in Victoria, Australia, I'd like to give a great big thank you to everyone on this forum (and others) that helped me...
Forum: Embedded Systems and Microcontrollers 09-05-2013, 02:28 PM
Replies: 84
Views: 6,654
Posted By chrischrischris
I suppose I'm using my Arduino at the moment for...

I suppose I'm using my Arduino at the moment for some limited functions, so I can really say much here now. The only thing I can say however, is I'm having heaps of fun. I've written my first code...
Forum: Embedded Systems and Microcontrollers 09-04-2013, 12:22 AM
Replies: 84
Views: 6,654
Posted By chrischrischris
Absolutely agree. There are those who will study...

Absolutely agree. There are those who will study chips in detail and therefore come up with newer better chips. But I wonder whether more is achieved by working together (with people of all...
Forum: Embedded Systems and Microcontrollers 09-03-2013, 11:01 PM
Replies: 84
Views: 6,654
Posted By chrischrischris
I had a maths teacher back in high school, who...

I had a maths teacher back in high school, who always said to us, "when you do something, do it the quickest, easiest way you know how". I agree with that principle.

I am relatively new to...
Forum: Embedded Systems and Microcontrollers 09-02-2013, 09:17 PM
Replies: 84
Views: 6,654
Posted By chrischrischris
The LEDs will be used in digit displays outdoors...

The LEDs will be used in digit displays outdoors and via PWM code and an LDR so that their brightness will adjust to suit daylight / night. I'd just like to be able to achieve typical 20mA...
Forum: Embedded Systems and Microcontrollers 09-02-2013, 09:59 AM
Replies: 84
Views: 6,654
Posted By chrischrischris
Hey, I've had a try at programming the Arduino...

Hey, I've had a try at programming the Arduino Uno (compatible) using online reference codes, reference material and code with the software - lot of fun!

I've since created the typical "blinking...
Forum: General Electronics Chat 08-18-2013, 10:04 AM
Replies: 413
Views: 33,017
Posted By chrischrischris
Pin 12 sets the home score up 1 unit. To do...

Pin 12 sets the home score up 1 unit. To do this, the remote turns on the relay to ground this pin (hence the reason for the pull-up resistor in the normal state). The ideal would be no capacitor,...
Forum: Embedded Systems and Microcontrollers 08-17-2013, 10:29 PM
Replies: 84
Views: 6,654
Posted By chrischrischris
I'd be happy to, however I'm not sure how to...

I'd be happy to, however I'm not sure how to create a blog in here. Also, what I ended up doing is start to watch a series of youtube videos by Jeremy Blog - their...
Forum: General Electronics Chat 08-17-2013, 01:01 PM
Replies: 413
Views: 33,017
Posted By chrischrischris
I'd try the suggestion, but not sure exactly...

I'd try the suggestion, but not sure exactly where to wire it in. When you've got time, could you give me a little more detail.

As for the 1V, yes, it's really odd. Does it look to you as if it...
Forum: General Electronics Chat 08-17-2013, 12:41 PM
Replies: 413
Views: 33,017
Posted By chrischrischris
Bill, for the score increment count, via a...

Bill, for the score increment count, via a transmitter/receiver, a relay sends a ground signal to pin 12 of the 4093. To "slow" this down so it doesn't false trigger, I've added a 3.3uF electolytic...
Forum: General Electronics Chat 08-16-2013, 11:29 PM
Replies: 413
Views: 33,017
Posted By chrischrischris
I'm trying to check it again this morning and...

I'm trying to check it again this morning and found the following:

1. If I put a pen cap on the end of the LDR to make it dark neither the 2N2907 or 2N2222 heat up (when the leds are dim) - good...
Forum: Feedback and Suggestions 08-14-2013, 01:16 PM
Replies: 19
Views: 1,345
Posted By chrischrischris
Hey, interesting topic and growing rapidly. I...

Hey, interesting topic and growing rapidly. I recently gave a talk at an AutoDesk conference in LA on affordable 3D printing for prototyping. It was based on a "UP Plus" 3D printer. It cost us...
Forum: General Electronics Chat 08-13-2013, 11:59 AM
Replies: 413
Views: 33,017
Posted By chrischrischris
Q2 is the 2N2907 and is the one near the base of...

Q2 is the 2N2907 and is the one near the base of the circuit. The one above it is Q1 which is the 2N2222.
Photos:
58407 58408 58409

Not sure if this is correct in trying to work out PNP and...
Forum: Embedded Systems and Microcontrollers 08-12-2013, 12:59 PM
Replies: 84
Views: 6,654
Posted By chrischrischris
I ended up getting the Arduino equivalent. I've...

I ended up getting the Arduino equivalent. I've since programmed a flashing LED, a stable switch (eliminating "bounce"), a dimming led, a PWM circuit based on mapping the resistance from an LDR -...
Forum: General Electronics Chat 08-12-2013, 12:53 PM
Replies: 413
Views: 33,017
Posted By chrischrischris
I did what you suggested and it started, but then...

I did what you suggested and it started, but then thought I should check the board more closely. There was a bit of solder on the back which was tying 2 pins. It fixed that problem.
Forum: General Electronics Chat 07-29-2013, 03:28 AM
Replies: 413
Views: 33,017
Posted By chrischrischris
I drew the circuit first and labelled it with...

I drew the circuit first and labelled it with things such as Resistor or 470Ω. When I then drew the PCB, I started to part number these. I later updated the circuit diagram to match the PCB, but...
Forum: General Electronics Chat 07-28-2013, 09:06 PM
Replies: 413
Views: 33,017
Posted By chrischrischris
Yes, I agree. On the weekend I spent a few hours...

Yes, I agree. On the weekend I spent a few hours checking the circuit layout against the PCB layout. I did have all the diodes mis-labelled between them, but that is all I could see wrong. There...
Forum: General Electronics Chat 07-28-2013, 07:49 AM
Replies: 413
Views: 33,017
Posted By chrischrischris
I don't have a schematic. It is a standard power...

I don't have a schematic. It is a standard power supply - refer link:

http://www.ebay.com.au/itm/360503427010?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
Forum: General Electronics Chat 07-28-2013, 03:10 AM
Replies: 413
Views: 33,017
Posted By chrischrischris
Thanks Relayer. Yes the IN5401 was an after...

Thanks Relayer. Yes the IN5401 was an after thought. In a clock circuit I found on the web (Doctronics), I read that there should be an in-line diode I think from memory in case of reverse polarity...
Forum: Embedded Systems and Microcontrollers 07-28-2013, 02:56 AM
Replies: 84
Views: 6,654
Posted By chrischrischris
Good point. It would only be a problem I suppose...

Good point. It would only be a problem I suppose if I somehow overcooked the chip and it somehow shorted the Vcc pin (assuming there is one).
Forum: Embedded Systems and Microcontrollers 07-28-2013, 02:09 AM
Replies: 84
Views: 6,654
Posted By chrischrischris
Thumbs up Mr potato, your absolutely right. I was debating...

Mr potato, your absolutely right. I was debating with myself the Uno vs Mega as I could see the Uno had a replacable chip whereas the Mega didn't. Yes, I could blow it up and then were will I be. ...
Forum: General Electronics Chat 07-28-2013, 01:58 AM
Replies: 413
Views: 33,017
Posted By chrischrischris
Hey Relayer, we spotted with the Jaycar purchase!...

Hey Relayer, we spotted with the Jaycar purchase! Yes I think I got them in a packet of 10 because I have 4 left in my parts box, which means I used 2 on one board and 2 on the spare board. I just...
Showing results 1 to 25 of 264

 
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