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1  Development / Other Hardware Development / Re: Arduino compatible board for energy monitoring on: August 11, 2012, 02:02:10 pm
Wrong values of course smiley-grin

I just copy pasted the closest resistor that had the same size.
2  Development / Other Hardware Development / Re: Arduino compatible board for energy monitoring on: August 11, 2012, 08:29:23 am
Thanks for your quick and helpful comments Crossroads smiley

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I don't see any decoupling caps(100nF) on the power pins for the various devices.

I didn't know about this practice, could you please tell me more about it? or suggest reading? and I just put it on the Vin pin of a device? or between VCC and GND?

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I see a diode on the FTDI power interface - if someone plugs in a 5V USB/Serial adapter, that will put 4.3V on the VCC line, could be a problem with the rest of the board appearing to run at 3.3v based on the power header.  Most 3.3V devices only want 3.6 to 3.8V Absolute max.

You are right, those 4.3V go to the Regulator Vin. Was that wrong?

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Standard anymore is a diode across the reset pullup resistor to dissipate any spikes to the Vcc pin and  not put the uC into high voltage reset state.
I've posted the Atmel Application Note on that a few times.

I'll do that.

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Your ICSP header is in a non-standard location. Could be a problem for some shields.

You're right, but I'm afraid I can't put it where it should, at least in this design.

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Rx & Tx need to be swapped on the FTDI header.

I'm a little confused here: I thought the FTDI's RX goes to arduino TX and vice versa. Is it wrong?

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What is the Aref solder jumper for?

I was not sure if I must set my AnalogReference to external and connect it to VCC so I offered myself that possibility later.

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Are there top & bottom layer ground planes? Hard to tell from the drawing.

Bottom plane is, but not the top. Do you advise to create a GND polygon on the top too?

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Move the signal names away from IC3, can't read what they are.

Will do, sorry smiley-grin

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Overall, I'd  say Good start.

Thank you sir smiley-wink
3  Development / Other Hardware Development / Arduino compatible board for energy monitoring on: August 05, 2012, 04:08:46 pm
Hey everyone,
This project is based on the Open Energy Monitor designs (http://openenergymonitor.org/). It is an ATMega with Uno bootloader, an RFM12B radio module, a space for a WIZ820IO (Wiznet W5200 ethernet chip) + jacks for four clamps current sensors and one AC AC voltage adapter.
Power supply is on the board (same AC AC voltage sensor)

This is my first PCB with a microcontroller on board so I am a little nervous to send it to be fabbed (especially that it's all SMD).

Would be great if you could have a look at my schematics and board files and give me some feedback.
Thanks
4  Using Arduino / General Electronics / Re: What's wrong with my Multimeter? on: June 16, 2012, 11:10:44 pm
Now I understand how so many members make thousands of forums posts smiley-grin
5  Using Arduino / General Electronics / Re: What's wrong with my Multimeter? on: June 16, 2012, 10:48:37 pm
I got this all... it's not my first or only meter...
I am looking for someone's advice here. Maybe you got this before and a few resistors could give it a new life...
6  Using Arduino / General Electronics / Re: What's wrong with my Multimeter? on: June 16, 2012, 09:55:54 pm
First thing I did. Didn't help though
7  Using Arduino / General Electronics / Re: What's wrong with my Multimeter? on: June 16, 2012, 09:32:57 pm
Do you suggest to open the multimeter and test these resistors? Are they not protected by the fuse?
Do you think it's repairable?
8  Using Arduino / General Electronics / What's wrong with my Multimeter? on: June 16, 2012, 09:09:45 pm
Hello,
I have this Multimeter (http://www.amazon.com/gp/product/B000JFK6XC/) and it was working perfectly until last week.
Now it can not measure resistance and test diodes. It still can measure AC and DC currents properly, and capacitance as well.
I put fresh batteries in it. It changes nothing.

Any ideas why this is happening and if I can fix it?

Thanks
9  Using Arduino / Programming Questions / Re: Serial.read crazy results on: May 13, 2012, 01:28:07 pm
Really nice of you to take the time to write this, but it outputs exactly the same result. each byte on a similar line.

I have the feeling that this function is the answer, but I can't implement it:

http://arduino.cc/en/Reference/StreamReadBytes
10  Using Arduino / Programming Questions / Re: Serial.read crazy results on: May 13, 2012, 12:25:18 pm
how?
11  Using Arduino / Programming Questions / Re: Serial.read crazy results on: May 13, 2012, 11:18:31 am
Works great! with: 'No line ending'

but now it reads only one digit. So if I type 10, I get :

I received: 1
I received: 0

what should I change?

PS: Thanks dxw00d smiley
12  Using Arduino / Programming Questions / Re: Serial.read crazy results on: May 13, 2012, 10:59:11 am
Yes
13  Using Arduino / Programming Questions / Re: Serial.read crazy results on: May 13, 2012, 10:46:49 am
thanks for your answer dxw00d, but man I'ma Newb smiley-grin

what you wrote is like chinese to me. could you please explain further? I'd be grateful to you

Thanks
14  Using Arduino / Programming Questions / Re: Serial.read crazy results on: May 13, 2012, 10:40:47 am
and how can I fix this?
15  Using Arduino / Programming Questions / Re: Serial.read crazy results on: May 13, 2012, 10:35:27 am
I get that one, but it doesn't explain the systematic second line = 10.
It is the ASCII symbol for a new line and I don't know how to get rid of it.

Any ideas?
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