Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Disk rotation counter for Watt hour meter

Status
Not open for further replies.

amila133

Member level 4
Joined
Oct 13, 2009
Messages
73
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Location
Sri Lanka
Activity points
1,757
Hi there!
Can you give me an idea how to count the disk rotation of a kilowatt hour meter?
Need a photo sensor and a small PIC that can be mounted inside the meter case.
I need to have also a real time clock and program to store the "time of use" of electric energy.

Any idea? Thanks...
 

penoy_balut

Full Member level 2
Joined
Sep 8, 2007
Messages
148
Helped
26
Reputation
52
Reaction score
10
Trophy points
1,298
Activity points
1,943
Bore a hole on the disk and put photo sensor aligned to it.
 

amila133

Member level 4
Joined
Oct 13, 2009
Messages
73
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Location
Sri Lanka
Activity points
1,757
Thanks...
I will try.
If any one has different ideas pls tell me.
 

binojkumar

Full Member level 3
Joined
Jul 19, 2004
Messages
151
Helped
2
Reputation
4
Reaction score
1
Trophy points
1,298
Location
Bangalore
Activity points
983
amila133 said:
Thanks...
I will try.
If any one has different ideas pls tell me.

If it is an electronic meter we can count the pulse and the number of pulse divided by meter constant u will get the exact unit of consumption.
 

FANT

Advanced Member level 1
Joined
Feb 27, 2002
Messages
415
Helped
52
Reputation
104
Reaction score
37
Trophy points
1,308
Location
Italy
Activity points
3,647
If the wattmeter belongs the power company there is no way to make an hole, insert sensors etc inside the meter.
If the pocation is dark, try to detect the difference in reflection as the disk is turning ( here the disk is 90 % black and 10 % red ) , but be careful about the daylight.

Mandi
 

Slorn

Junior Member level 2
Joined
Oct 20, 2009
Messages
22
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,283
Location
Belgium
Activity points
1,412
penoy_balut said:
Bore a hole on the disk and put photo sensor aligned to it.
Don't do that! I think, the disk is a crucial element in the measuring setup. If you bore a hole in it you will probably destroy the accuracy of the measurement. I'm not an expert but that's what I remember from classes. Anyone else?

Slorn
--
Dwengo... gets you started with microcontrollers!
 

pranam77

Advanced Member level 5
Joined
Apr 22, 2008
Messages
2,786
Helped
552
Reputation
1,102
Reaction score
370
Trophy points
1,363
Location
INDIA
Activity points
16,411
amila133 said:
Hi there!
Can you give me an idea how to count the disk rotation of a kilowatt hour meter?
Need a photo sensor and a small PIC that can be mounted inside the meter case.
I need to have also a real time clock and program to store the "time of use" of electric energy. Any idea? Thanks...
Are you planning a new project of an energy meter as per your mentioned idea or you are trying to modify an existing meter?
 

amila133

Member level 4
Joined
Oct 13, 2009
Messages
73
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Location
Sri Lanka
Activity points
1,757
I want to do a modification for a existing system. It is not a electronic meter. Disk rotating watt hour meter. I want to sense the no of rotations?
 

pranam77

Advanced Member level 5
Joined
Apr 22, 2008
Messages
2,786
Helped
552
Reputation
1,102
Reaction score
370
Trophy points
1,363
Location
INDIA
Activity points
16,411
amila133 said:
I want to do a modification for a existing system. It is not a electronic meter. Disk rotating watt hour meter. I want to sense the no of rotations?
Then reply from "penoy_balut" best suits your requirement. Cheers
 

zorro

Advanced Member level 4
Joined
Sep 6, 2001
Messages
1,131
Helped
356
Reputation
710
Reaction score
298
Trophy points
1,363
Location
Argentina
Activity points
8,902
Slorn said:
penoy_balut said:
Bore a hole on the disk and put photo sensor aligned to it.
Don't do that! I think, the disk is a crucial element in the measuring setup. If you bore a hole in it you will probably destroy the accuracy of the measurement. I'm not an expert but that's what I remember from classes. Anyone else?
Slorn
Slorn is absolutely right.
You can use a reflective sensor.
Regards

Z
 

mvs sarma

Advanced Member level 3
Joined
Apr 23, 2006
Messages
789
Helped
121
Reputation
244
Reaction score
80
Trophy points
1,308
Location
Hyderabad, India.
Activity points
5,578
paint an annular ring at the edge of the disk, with a small reflecting sticker at one location
have a light beam that could reflect light to sensor, every time reflective strip reaches that location.
it should serve your need
 

pranam77

Advanced Member level 5
Joined
Apr 22, 2008
Messages
2,786
Helped
552
Reputation
1,102
Reaction score
370
Trophy points
1,363
Location
INDIA
Activity points
16,411
Please note that to use refletive technique, the Rotary Disk should be a Non reflective one where you can place a reflective tape or sticker. Or usually as we see the Disk will be alluminium and shining, and thus you may use reflective technique to detect opaque part by pasting a paper or a piece of an insulating tape. Cheers
 

penoy_balut

Full Member level 2
Joined
Sep 8, 2007
Messages
148
Helped
26
Reputation
52
Reaction score
10
Trophy points
1,298
Activity points
1,943
A one millimeter hole in the disk edge then installed with IR LED emitter and transmitter from a discarded mouse works for me.
Tampering of power meters is illegal so buy a sub-meter for experimentation.
 

mvs sarma

Advanced Member level 3
Joined
Apr 23, 2006
Messages
789
Helped
121
Reputation
244
Reaction score
80
Trophy points
1,308
Location
Hyderabad, India.
Activity points
5,578
pranam77 said:
Please note that to use refletive technique, the Rotary Disk should be a Non reflective one where you can place a reflective tape or sticker. Or usually as we see the Disk will be aluminum and shining, and thus you may use reflective technique to detect opaque part by pasting a paper or a piece of an insulating tape. Cheers
that is what exactly made me say pant a annular ring and then put reflective sticker, the paint would be black

drilling hole makes disk unbalance
 

amila133

Member level 4
Joined
Oct 13, 2009
Messages
73
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Location
Sri Lanka
Activity points
1,757
Hi there,

in order to count the disk rotation times tell me what is the most suitable?
1. Reflective sensor
2. IR led and transmitter pair

If I use IR pair I have problem because how should I mount IR led in the disk and How should I power it?

If you have pls give me Numbers of the above sensors.

Thanks
 

hameeds01

Advanced Member level 2
Joined
Aug 23, 2005
Messages
599
Helped
75
Reputation
156
Reaction score
40
Trophy points
1,308
Location
Islamabad Pakistan
Activity points
4,542
u can get a pair of IR LED & Receiver from an old Ball Mouse free of cost.
secondly u don't have to put the IR LED in the Disk.
just make a small cut on the disk such that the IR beam can pass through it
 

amila133

Member level 4
Joined
Oct 13, 2009
Messages
73
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Location
Sri Lanka
Activity points
1,757
Hi,
Making cuts and holes on the disk may course to measurement errors. Am I correct?
So if any idea pls give me.
Thanks
 

pranam77

Advanced Member level 5
Joined
Apr 22, 2008
Messages
2,786
Helped
552
Reputation
1,102
Reaction score
370
Trophy points
1,363
Location
INDIA
Activity points
16,411
amila133 said:
Hi there,
in order to count the disk rotation times tell me what is the most suitable?
1. Reflective sensor
2. IR led and transmitter pair
It all depends on your skill and knowledge in electronics and construction of the mechanism to fit the sensors. Any one of the mentioned above will work fine.

amila133 said:
If I use IR pair I have problem because how should I mount IR led in the disk and How should I power it?
Pratically there is no need to fit the disk with any led's. The IR led and the sensors are basically mounted across the disc so that the disc passes between the two. I couldnt get what ideas you have..but again, my last answer best suits here.

amila133 said:
If you have pls give me Numbers of the above sensors.
http://www.united77.com/datasheets/IR led.pdf
http://www.united77.com/datasheets/Photo diode.pdf

Cheers
 

    amila133

    points: 2
    Helpful Answer Positive Rating

amila133

Member level 4
Joined
Oct 13, 2009
Messages
73
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Location
Sri Lanka
Activity points
1,757
Hi,
Optic sensor in the mouse is suitable for this work?
How should I implement it in order to count no of rotations

cheers
 

hameeds01

Advanced Member level 2
Joined
Aug 23, 2005
Messages
599
Helped
75
Reputation
156
Reaction score
40
Trophy points
1,308
Location
Islamabad Pakistan
Activity points
4,542
yeah with ball mouse IR sensors u can do that.



other options are
1) hall effect sensor and magnet
2) reflector on disc with IR

better to use mouse sensors cheap ...

then count the number of pulses via external interrupt

don't forget to click on Helped me button
 
Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top