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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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12th Dec 2019, 9:52 am | #1 |
Heptode
Join Date: Sep 2004
Location: Preston, Lancashire, UK.
Posts: 632
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Rotary position sensor ideas?
Im thinking about putting together a small 12 volt rotator system, for my truck static mobile hill topping next year.
doing a search of worm gears has brought up a cheap source of 12V dc worm geared motor drives, which has much simplified the drive design, however I need a simple means of position indicating. I have in my collection a load of small reed relays, so could do a fixed board with a number of those on and a rotating disc with a small magnet on it, and a number of leds on the control box, but this would mean multicore wiring between the rotator and control box. I also have Bourns precision 10k 10 turn pots, so could feed the control unit with a DC position dependent voltage. this could then be used to drive a number of options for position indication, ranging from an LM3914 driving bar graph LEDS, to an a/d converter, display driver, and a 7 segment LED degree display, but it really doesnt need to be so complicated. Has anyone either done this or seen a tried and tested circuit, don't want to re-invent the wheel if possible. |
12th Dec 2019, 11:51 am | #2 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,903
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Re: rotary position sensor ideas
How about one of those little fluxgate magnetometer compass modules mounted on your mast.
Whichever way you park the truck, the readout gives you the bearing. David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
12th Dec 2019, 2:42 pm | #3 | |
Heptode
Join Date: Sep 2004
Location: Preston, Lancashire, UK.
Posts: 632
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Re: rotary position sensor ideas
Quote:
posting this here so I dont lose the link https://www.electro-tech-online.com/...ircuit.120242/ |
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12th Dec 2019, 2:58 pm | #4 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,010
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Re: Rotary position sensor ideas?
The commercial rotators by the likes of CDE, Hy-Gain etc generally just use a potentiometer, a DC supply and a meter.
Of course a traditional pot only has something like 300 degrees of rotation, so you would either need to gear it down, or use a 5- or 10-turn over a restricted part of its travel. A 270-degree meter (as used on industrial control-panels etc) suitably recalibrated would make a good angle-of-twist display. |
12th Dec 2019, 3:08 pm | #5 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,511
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Re: Rotary position sensor ideas?
Use a synchro transmitter and receiver.
Andy |
12th Dec 2019, 4:24 pm | #6 | |
Guest
Posts: n/a
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Re: Rotary position sensor ideas?
Quote:
Funnily enough I have just used said motor for my loop antenna. I used a 2:1 reduction gear to a pot and an old radio control servo board to "do the magic", works a treat over 100 feet of cable. I merrily send a pulse between 1 and 2ms and it goes to a position. Here it is before installation. |
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13th Dec 2019, 12:36 am | #7 |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,343
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Re: rotary position sensor ideas
No, you need extra electronics of some sort to read the data out of them.
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