Electrical guru's.......how would I do this?
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B*a*n*n*e*d
Joined: Sep 2000
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From: Philadelphia, PA, USA
Electrical guru's.......how would I do this?
Ok, I want to make a light to go on whenever I'm in boost (its just good to know). Anyway, I have two sensors I can tap into, the pressure sensor for my GReddy boost gauge (1.5V at atmosphere) or the pressure sensor for my MF2 (2.4V at atmosphere). Now I have two questions:
1) How would I wire something up to turn the light on only when the voltage is where I want it (either 1.5V or 2.4V depending on which sensor I use)? I was thinking about a relay, but how would I do it? With a resistor?
2) Which of these two sensor should I tap into. I dont want to disrupt the signal or anything becuase they are both very important signals, especially the MF2 (I guess that kinda answers my question
).
Thanks.
[Modified by 00SilverLS, 10:05 PM 1/2/2002]
1) How would I wire something up to turn the light on only when the voltage is where I want it (either 1.5V or 2.4V depending on which sensor I use)? I was thinking about a relay, but how would I do it? With a resistor?
2) Which of these two sensor should I tap into. I dont want to disrupt the signal or anything becuase they are both very important signals, especially the MF2 (I guess that kinda answers my question
).Thanks.
[Modified by 00SilverLS, 10:05 PM 1/2/2002]
New User
Joined: Jun 2001
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From: NYC/Binghamton, NY
Re: Electrical guru's.......how would I do this? (00SilverLS)
You'll need a TTL level transistor, assuming that you'll be connecting LED's to use as the light. You don't really need a resistor unless the voltage supplied is above specs.
If you want to get "complicated" you can use a 2 input OR gate and hook up both sensors to it.
If you want to get "complicated" you can use a 2 input OR gate and hook up both sensors to it.
Joined: Dec 2001
Posts: 11
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From: Elgin, IL, u.s.
Re: Electrical guru's.......how would I do this? (00SilverLS)
To make it simple....I would think that you may be able to buy two voltage meters that vary from 0v-5v dc.
Which is a digital volt meter. They only read up to 5 volts. Maybe they might have some at radio shack, but I recommened to look in electrical magazines I'm sure that they might have more to choose from. Also, may have different functions, like turn on a light at a certain voltage and also see what the voltage is set at.
It might take some time to find some but i am sure that it will not hurt any of your signals and be an easy install (positive wire to sensor and negative wire to ground)
Which is a digital volt meter. They only read up to 5 volts. Maybe they might have some at radio shack, but I recommened to look in electrical magazines I'm sure that they might have more to choose from. Also, may have different functions, like turn on a light at a certain voltage and also see what the voltage is set at.
It might take some time to find some but i am sure that it will not hurt any of your signals and be an easy install (positive wire to sensor and negative wire to ground)
Honda-Tech Member
Joined: Jan 2000
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From: FL, USA
Re: Electrical guru's.......how would I do this? (00SilverLS)
2 diodes in series would get you a 1.4v drop. Each diode is worth approx. 0.7 volt drop. Without more data that's the closest I can get you to the 1.5volts. Since the MF2 is critical I would suggest that you leave it alone and use the sensor for the Greddy boost gauge.
Just tap the sensor wire that goes to the Greddy guage
pressure sensor wire -+---> diode--> diode ---> relay-->LED.
Since most LED's need at least 5V you'll need to use a relay to supply the correct voltage for it to light up.
[Modified by 95LSS, 8:02 PM 1/4/2002]
[Modified by 95LSS, 8:03 PM 1/4/2002]
Just tap the sensor wire that goes to the Greddy guage
pressure sensor wire -+---> diode--> diode ---> relay-->LED.
Since most LED's need at least 5V you'll need to use a relay to supply the correct voltage for it to light up.
[Modified by 95LSS, 8:02 PM 1/4/2002]
[Modified by 95LSS, 8:03 PM 1/4/2002]
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