bump sensor

Status
Not open for further replies.
C

crush24

New Member
i would like to ask on how to make a bump sensor using PIC16F84A for my automated vacuum cleaner project..thanks
 
use a pressure transduser if you want to measure the force of the impact
if it is only an detection that have to steer the transportation motors a different direction then end switches would do the job already (no PIC needed)

Robert-Jan
 
rjvh said:
use a pressure transduser if you want to measure the force of the impact
if it is only an detection that have to steer the transportation motors a different direction then end switches would do the job already (no PIC needed)

Robert-Jan
Click to expand...

but i have to use a PIC as a requirements...
 
crush24 said:
but i have to use a PIC as a requirements...
Click to expand...

A PIC isn't a sensor, but you can write code for a PIC which will allow it to take input from sensors and react accordingly.

Do you know how to program a PIC yet? At least a simple program to make an LED flash? If not (and even if you have some basic understanding of the PIC) then I suggest Nigel's tutorials at http://www.winpicprog.co.uk would be a good place to start learning how to use a PIC.

While you're working through that, you need to work out what all the specifications for the robot will be. How much will it weigh, what will the power supply be, what kind of drive mechanism will you use, how many sensors will it need, how much can it cost, etc.

That last one is pretty important. If you have several thousand dollars to spend you will probably make different decisions than if you only have a couple of hundred.


Torben
 


ok thanks..how about in dust sensor??what sensor is applicable for my project?
 
Do you have to actually build this, or just come up with a conceptual design/schematics?
If the former does the school give you a budget, or is this out of pocket. I only ask so suggestions are not made beyond your budget
 
Last edited:
Mikebits said:
Do you have to actually build this, or just come up with a conceptual design/schematics?
If the former does the school give you a budget, or is this out of pocket. I only ask so suggestions are not made beyond your budget
Click to expand...

nope..out of my own pocket..and hav to build it..miniature is optional..
 
crush24 said:
nope..out of my own pocket..and hav to build it..miniature is optional..
Click to expand...

Good to know, so scratch my previous suggestion. Hmm, bump detection...

I do not know what the exact name is, but there use to be these old jar sensors that they used in old car alarms.
I will try to remember, or maybe someone else knows what I am talking about.

I will have to try and vacuum out some of the dust in my head...
 
Hm. My son has a toy which has a simple "bump" sensor built into it.

It's essentially a switch, but instead of regular contacts is uses a spring and a tube, which are both conductive metal. The spring is attached to one side of the switch, and the tube to the other. The tube is mounted vertically on the circuit board and the spring is mounted inside the tube, so that normally the spring does not come into contact with the tube. When the whole thing is jarred, then the spring bends enough to touch the tube wall, which closes the "switch" briefly, but long enough to be sensed.

Then the damn toy starts singing.

I wonder if the spring from a ballpoint pen and a small-gauge aluminium standoff would work for something like this.


Torben
 
I think the term I was looking for was shock sensor. Digi-key has some at a cost of .78 cents
PKGS-00MF-R-ND PKGS-00MF-R SENSOR SHOCK Murata Electronics
 
hi crush,

Look at this device, I keep planning to get a few for testing.

**broken link removed**
 
Mikebits said:
Very cool idea, but how do you connect an interface to them? I mean leads for connections.
Click to expand...

hi,
Page 862 of the Maplin catalog gives Intefacing details.

Basically its fixed between to electrodes, can be glued or a pressure fit.

For Ref: QTC cable is also available.
 
Considering the budget, this would seem ideal. I guess he would just surround the bumper with this stuff. Is that your thinking?
 
Status
Not open for further replies.

Similar threads

G
  • Question
Replace Hall sensor with switch in Tuya door/window sensor
Replies
9
Views
2K
rjenkinsgb
U
  • Question
What type of sensor is this?
Replies
2
Views
1K
JimB
J
  • Question
Waterflow detection using Hall Effect sensor
Replies
12
Views
2K
Nigel Goodwin
B
  • Question
Game Laser Sensor
2
Replies
21
Views
4K
Tony Stewart
J
  • Question
Adult Walker proximity sensor
Replies
7
Views
2K
JC777
J
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…