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1  Using Arduino / Networking, Protocols, and Devices / How to check if TX/RX is working? on: May 20, 2012, 06:06:19 pm
Hi! I have bought 2 boards, arduino duemilanove and pro mini, and 433Mhz RF transmitter and receiver kit (example: http://www.ebay.com/itm/433Mhz-RF-transmitter-and-receiver-kit-Arduino-ARM-MCU-/160689109514#ht_1604wt_952)

Following VirtualWire tutorials, I've uploaded simple test code. Transmitter sends data, receiver gets it. But for some reason, receiver gets nothing smiley-cry( How can I troubleshoot it?

1. I made sure, that transmitter is connected to Board 1 pin 7, and sends data using pin 7. I made sure, that it is grounded and powered from 5V properly. Actual receiver is very simple, so I can't really tell, is it working or not.

2. I made sude, receiver is connected to Board 2 pin 7, and recevies data via pin 7. It is powered and grounded properly as well. But serial monitor outputs only "setup ready", and no incoming data at all...

What can I do from this point? I have no clue, what if they are faulty, or what if I did something wrongly.

Regards,
Konstantin.
2  Using Arduino / Project Guidance / Re: Battery timer switcher on: December 09, 2011, 05:44:19 pm
Thanks a lot for the answer! N-channel logic level MOSFET will do the trick, will google everythign about it now.

Best regards,
K.
3  Using Arduino / Project Guidance / Battery timer switcher on: December 07, 2011, 05:05:52 pm
Hi! I have a simple project I want to make, but I have limited knowledge in electronics component variety, so I hope to get a little bit of advice.

Scenario:
I have arduino and hobby king transmitter connected together. On button being pressed, transmitter sents signal to receiver. Receiver will establish connection between battery/heating wire, keep it connected for 4 seconds, and disconnect them back.

Ok, I've got arduino and transmitter working together. Now as for battery-receiver-heating wire part: what is the best way to make it reliable? Ideally, I want to use only 1 battery source for receiver and heating wire to keep place usage at minimum. Receiver needs 4.2V, heating wire around 9V, so I'll probably end up using 12V battery and 2 voltage regulators.

What is the best way to make system reliable?

I can imagine this draft:
1. When receiver gets signal, its activates (?) something.
2. That something(?) connect battery and heating wire together.
3. Adruino wait 4 seconds.
4. Signal again, now that (?) something disconnect battery and heating wire.

So, my question is, what that (?) something might be? And...
Is it possible to use only 1 battery? Like, at some point, it will have to power receiver and heating wire through some voltage regulators together - is that reliable? Or I have to stick to 2 separate batteries here?

Thanks!
4  Using Arduino / Networking, Protocols, and Devices / Re: Standard Transmitter and reciever on: February 01, 2011, 01:43:49 pm
Hi! I'm looking into this matter myself, newbie as well.
Here what I have found so far:
http://www.rcgroups.com/forums/showthread.php?t=967207&page=216
5  Using Arduino / Project Guidance / Re: Help to choice a right board on: February 01, 2011, 10:31:52 am
Thanks! XBee sounds like a good solution. I want to make laser-tag game at my city, but instead of infrared, I want to use higher frequencies, in order to hide sensors behind people clothes.

Infrared beams could be focused with lenses, but here I can use directional antennas only. I guess all I can push from 2.4GHZ is a 30 degree beam (yagi antenna around 15cm).

Maybe it IS possible to screen beam somehow, to make it much more narrower, but I couldn't find anything about that. Well, I guess I should buy two arduino mini boards and 2.4GHZ Xbee, and starting experimenting once I have them. Little by little, something will come up =)
6  Using Arduino / Project Guidance / Re: Help to choice a right board on: January 31, 2011, 08:36:43 pm
Thanks for the replies. Actually, you are right, using 2 Bluetooths would be too much. I've learned LOTS of stuff in the last 2 days, and I actually start getting the idea. So I'll have 1 bluetooth constantly operating, which also will save power. Thanks for pointing to the LCD! I've learned lots about them as well now.

Now, as for another one signal transmitter... Here I've got one question:

At some point, I need to press a button and sent short signal from transmitter to the sensor in front of me. Sensor might be hidden behind a obstacle, that is why I can't use infrared here.

Also, my beam has to be as narrow as possible. ( < 10 degree)

So, I'm planning to use very high frequency + directional antenna to achieve this. As low frequencies will make antenna unreasonably large.

I don't care about 100m or 200m, I need to operate only within 0-10m range.

So, what is most highest frequency I can use? 5Ghz? As far as I learned, there are restrictions by law. What is the optimal solution for me would be? Once again, briefly: I need to sent as narrow as possible beam within 0-10m range.

7  Using Arduino / Sensors / Re: Narrow/Screen bluetooth on: January 30, 2011, 04:22:43 pm
Hi! I'm thinking to read bluetooth signal, but I need to sent and focus it as a beam, directionally. Is it conceptually possible to:
1. Focus bluetooth signal into a beam or

2. Screen transmitter in a way, than only little hole is left. Will that signal from the little hole fly only in one direction - forward, and will that lessen signal strength a lot on the receiver somewhere in the front?

Oh, I think I've found my answer finally. Direction antenna will do the trick.
http://www.pentest.co.uk/documents/bt_dongle_mod/bt_dongle_mod.html
just need to modify the dongle...
8  Using Arduino / Project Guidance / Re: Help to choice a right board on: January 30, 2011, 03:34:02 pm
Thank you, ArduinoBoardMini seems fine. I guess it has enough pins to fulfill my needs? LCD takes 6 pins, and 2 bluetooth devices takes 2 pins, right? So:

Digital I/O Pins   14 (of which 6 provide PWM output)
Analog Input Pins   8 (of which 4 are broken out onto pins)

should be fine, I guess?

Now I'll just double-check what kind of pins I really need here in the tutorials, as I still do not know difference between I/O and analog pins.
9  Using Arduino / Sensors / Narrow/Screen bluetooth on: January 30, 2011, 03:30:24 pm
Hi! I'm thinking to read bluetooth signal, but I need to sent and focus it as a beam, directionally. Is it conceptually possible to:
1. Focus bluetooth signal into a beam or

2. Screen transmitter in a way, than only little hole is left. Will that signal from the little hole fly only in one direction - forward, and will that lessen signal strength a lot on the receiver somewhere in the front?
10  Using Arduino / Project Guidance / Help to choice a right board on: January 30, 2011, 02:24:03 pm
Hi! I'm new to electronics, but I'll study all basics in a few days, as Arduino makes it quite simple. I have a project on my mind, and while
I study, I want to order a board, which will suit me the best. Can someone advise me the cheapest solution, which will match with those requirements?

1. Small size
2. Need to transmit bluetooth signal
3. Need to receive bluetooth signal (should be seperate part, connected so seperate pin)
4. Needs to have LCD screen

Surely, I'll buy bluetooth transmitter, receiver and LCD screen separately. Though, I still do not know about bluetooth transmitters, I hope they can be bought around at the stores.

Thanks!
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