Current Sensing??
Colt
Posts: 24
Been a while since I've been on here, winter time, so it's time to start back with my favorite winter hobby..
I'm wondering what I can use for current sensing? I've searched the forum's, couldn't find anything. But I'm no internet "Ninja" either..
I've always been a nut about engines and electricity, so I like to combine them when I can.. For the past several yrs I've been playing with making homemade generators out of odd stuff, my favorite is a 4 stroke weedeater engine running a automotive alternator. I use it all the time, 4 yrs old, several hundred hrs of run time, I love it..
I've been wanting to build a start/stop generator, using a 4000W AC generator, as well as a automotive style alternator.. Just never really had a need for it, I've got AC generators, and DC generators, never needed both at the same time.. What I'm doing now is I'm going to take a 13HP electric start diesel engine ( if I go with a gas engine, I'll want to fuel inject it, which would put me over budget ), direct drive to a AC generator, and inbetween have a pulley that drives the alternator.. I want to use this for a enclosed race car trailer I'm getting ready to buy.. I want to run a bank of batteries that the lights run off of ( or other things ), and have the generator maintain batt voltage.. Voltage is easy, but I want the setup to start up at a certain voltage, but only shutoff when the amperage is down around 6 amp's ( give or take ), or start when amp draw is high.. What can I use to sense current? I have no experience in this, and I actually looked around last yr and never found what I was looking for..
I'm wondering what I can use for current sensing? I've searched the forum's, couldn't find anything. But I'm no internet "Ninja" either..
I've always been a nut about engines and electricity, so I like to combine them when I can.. For the past several yrs I've been playing with making homemade generators out of odd stuff, my favorite is a 4 stroke weedeater engine running a automotive alternator. I use it all the time, 4 yrs old, several hundred hrs of run time, I love it..
I've been wanting to build a start/stop generator, using a 4000W AC generator, as well as a automotive style alternator.. Just never really had a need for it, I've got AC generators, and DC generators, never needed both at the same time.. What I'm doing now is I'm going to take a 13HP electric start diesel engine ( if I go with a gas engine, I'll want to fuel inject it, which would put me over budget ), direct drive to a AC generator, and inbetween have a pulley that drives the alternator.. I want to use this for a enclosed race car trailer I'm getting ready to buy.. I want to run a bank of batteries that the lights run off of ( or other things ), and have the generator maintain batt voltage.. Voltage is easy, but I want the setup to start up at a certain voltage, but only shutoff when the amperage is down around 6 amp's ( give or take ), or start when amp draw is high.. What can I use to sense current? I have no experience in this, and I actually looked around last yr and never found what I was looking for..
Comments
http://forums.parallax.com/forums/default.aspx?f=25&m=305434&g=305466#m305466
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It's Only A Stupid Question If You Have Not Googled It First!!
Both of them output 2.5 VDC with no current draw. Current in = higher than 2.5V, current out = less than 2.5V.
You can also use a current sense resistor and an ADC.
Jonathan
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www.madlabs.info - Home of the Hydrogen Fuel Cell Robot
As posted above, a hall sensor can read the "gauss" on a wire or coil "better", It sees magnetic fields. The resister method is often refferd to as a "SHUNT". If one was to read the voltage across the "SHUNT" or resister, The current flow can be calculated.
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