Author Topic: Need Help with Transmition Signals  (Read 2429 times)

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Offline LukethTopic starter

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Need Help with Transmition Signals
« on: February 05, 2009, 01:14:55 AM »
Hey guys i really need help... i'm making a robot for school and i want an infarred camera (night vision) and a long distance mic... I need to know what kind of signals that would be good to send up to 2km to a laptop or wireless controller. Does anyone have anyideas for a low bujet Camera, Mic and Signals to transfer the Image and sound... I have thought about UHF for the sound but have no idea for the visual, It neeeds to be sent to a small laptop
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Offline MaltiK

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Re: Need Help with Transmition Signals
« Reply #1 on: February 05, 2009, 06:32:37 PM »
Image to sound converision is very ambitious.

If you buy individual electronics/input devices (camera, mic, etc.) that have very long range, your budget would be filled almost instantly. A better bet would be to use an MCU connected to your camera, mic, etc. with the USART connected to a Xbee Pro 60mW with Wire Antenna (http://www.trossenrobotics.com/store/p/5827-Xbee-Pro-60mW-with-Wire-Antenna.aspx) 1 mile ~ 1.7km. And another Xbee unit connected to a laptop via USB Explorer, reading those values, and sending back TTL signals to the UART of the MCU.

Very, very ambitious
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Offline Soeren

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Re: Need Help with Transmition Signals
« Reply #2 on: February 06, 2009, 11:19:44 AM »
Hi,

The X-Bee with the 1 mile range is 10 kbps max. so won't get anywhere close to sending video.
Besides, this sounds like a project with a "naughty" purpose, so it's probably for the better that this is impossible on a low budget.
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Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline MaltiK

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Re: Need Help with Transmition Signals
« Reply #3 on: February 06, 2009, 01:55:42 PM »
Quote from: Soeren on February 06, 2009, 11:19:44 AM
Hi,

The X-Bee with the 1 mile range is 10 kbps max. so won't get anywhere close to sending video.
Besides, this sounds like a project with a "naughty" purpose, so it's probably for the better that this is impossible on a low budget.


Could you decrease the resolution and fps significantly and have it work?
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Offline chelmi

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Re: Need Help with Transmition Signals
« Reply #4 on: February 06, 2009, 02:50:32 PM »
Quote from: MaltiK on February 06, 2009, 01:55:42 PM
Quote from: Soeren on February 06, 2009, 11:19:44 AM
Hi,

The X-Bee with the 1 mile range is 10 kbps max. so won't get anywhere close to sending video.
Besides, this sounds like a project with a "naughty" purpose, so it's probably for the better that this is impossible on a low budget.


Could you decrease the resolution and fps significantly and have it work?

Just a back of the envelope calculation:
video resolution of 320*200 at 5 fps, 8 bits per pixel (greyscale)
320 * 200* 8 * 5 = 320000 bps = 312 kbps
The only solution would be to compress the video, with mpeg1 for instance. But this is completely imposible to do that in real time with an MCU.
And still you have to process sound...

Chelmi.
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