0
 OfflineFull Member
Karma: 0
Posts: 153
Arduino rocks
|
 |
« on: March 22, 2011, 08:22:09 am » |
I'm considering working on a robot that follows you. I'm not really sure what technology to use for it to know your location. Also, this will be a submersible robot, so please take that into account. Any ideas?
|
|
|
|
|
Logged
|
|
|
|
|
Global Moderator
UK
Offline
Brattain Member
Karma: 138
Posts: 19067
I don't think you connected the grounds, Dave.
|
|
« Reply #1 on: March 22, 2011, 08:24:01 am » |
A length of string.
Waterproof string.
|
|
|
|
|
Logged
|
Pete, it's a fool looks for logic in the chambers of the human heart.
|
|
|
|
0
Offline
Full Member
Karma: 0
Posts: 153
Arduino rocks
|
|
« Reply #2 on: March 22, 2011, 08:25:59 am » |
A length of string.
Waterproof string.
Ok, that's just funny! Really though, wireless (or string-less). |
|
|
|
|
Logged
|
|
|
|
|
Global Moderator
UK
Offline
Brattain Member
Karma: 138
Posts: 19067
I don't think you connected the grounds, Dave.
|
|
« Reply #3 on: March 22, 2011, 08:27:56 am » |
It wasn't meant to be funny, it was meant to be a practical solution to a problem that you have no idea how difficult it is to solve, even in two dimensions in air.
|
|
|
|
|
Logged
|
Pete, it's a fool looks for logic in the chambers of the human heart.
|
|
|
|
Ontario
Offline
God Member
Karma: 15
Posts: 717
|
|
« Reply #4 on: March 22, 2011, 11:43:34 am » |
On the cheap, you could rig-up an ultrasonic sender with a 555 timer and a scrounged piezo element. If you google around for bat detectors you will find suitable ultrasonic detector circuits, including guidance about choosing cheap electret microphones. Mount the microphone on top of a servo, behind a directional horn. The rest is up to your imagination.
|
|
|
|
|
Logged
|
|
|
|
|
Global Moderator
UK
Offline
Brattain Member
Karma: 138
Posts: 19067
I don't think you connected the grounds, Dave.
|
|
« Reply #5 on: March 22, 2011, 12:07:13 pm » |
Mount the microphone on top of a servo, behind a directional horn. ..taking particular care to ensure all is watertight. |
|
|
|
|
Logged
|
Pete, it's a fool looks for logic in the chambers of the human heart.
|
|
|
|
Ontario
Offline
God Member
Karma: 15
Posts: 717
|
|
« Reply #6 on: March 22, 2011, 02:58:11 pm » |
ensure all is watertight.
Well, of course. It has to work under water doesn't it? To be fair I totally missed the "underwater" part of the original specification. I always wonder why nobody wants "submerged in 300C 8 molar sulphuric acid at 10 bar" or "to operate in a vacuum whilst under 2,000 Gs acceleration and bombarded by 80 keV protons at 2 C/m2." No one seems to have *really* challenging homework any more. |
|
|
|
|
Logged
|
|
|
|
|
SG
Offline
Sr. Member
Karma: 3
Posts: 269
Arduino rocks
|
|
« Reply #7 on: March 22, 2011, 05:20:36 pm » |
|
|
|
|
|
Logged
|
|
|
|
|
Global Moderator
UK
Offline
Brattain Member
Karma: 138
Posts: 19067
I don't think you connected the grounds, Dave.
|
|
« Reply #8 on: March 22, 2011, 05:23:26 pm » |
From BillHo's link: If I were to do it, I would do middle mass detection on the color red, and wear a bright red shirt And the first colour to disappear under water is..? |
|
|
|
|
Logged
|
Pete, it's a fool looks for logic in the chambers of the human heart.
|
|
|
|
0
Offline
Full Member
Karma: 0
Posts: 153
Arduino rocks
|
|
« Reply #9 on: March 23, 2011, 08:44:09 am » |
Curse GPS and its inability to penetrate water!
Sorry guys, I had no idea it was this difficult. How do rescue beacons work?
|
|
|
|
|
Logged
|
|
|
|
|
Global Moderator
UK
Offline
Brattain Member
Karma: 138
Posts: 19067
I don't think you connected the grounds, Dave.
|
|
« Reply #10 on: March 23, 2011, 09:28:56 am » |
How do rescue beacons work Well mine's got a nice bright xenon strobe. Waterproof, like me, to 50 metres or more. |
|
|
|
« Last Edit: March 23, 2011, 09:35:04 am by AWOL »
|
Logged
|
Pete, it's a fool looks for logic in the chambers of the human heart.
|
|
|
|
|
