Re: Dash lights
I suppose Xbox trace repair puts you in the ball park somewhere.......
Ahhhhhh, but you do have "things", or going to have things on your motor eh?
You've been following along I assume?
1) You put a "switch" on for oil pressure? I gave you a link
2) You put a "switch" on for water temp? I gave you that link
3) Figured out you have the perfect alt to turn a light on when the alt. is dis-charging.
4) I'm giving you a circuit to turn a switch(relay) on when your fuel is low
Seems to me you have all the makings to not only now turn on individual lights for four distinct issues but........If you can turn a light on, couldn't, if you choose too, turn a horn on too? Hmmmmm, com'on now, think like an engineer.
Sooooo, after your lights are all tested and working like you want, And if you WANTED a horn to alert you of any or all of the four monitored systems failing/out of range, wouldn't you just need to "OR"(hint) each of those lights' signals? And then the output of this "OR'ing"(hint) thingie would just go turn on a Horn or buzzer or even call and alert the President to make Ice? Something to ponder I suppose.
Anyway........The Schematic
Referring to the plot below and schematic above ....
The voltage on the fuel gauges' "S" terminal (green trace...rough seas obviously) is the voltage representative of the gas [via a float and sender(potentiometer wired as rheostat)] in your tank and of course is displayed by the needle on your fuel gauge and varies from around 2.3 volts (full of gas) to 5.2 volts (empty of gas). **Standard sender 33-240Ω, AMC, Stewart Warner and most all marine apps**
You will need to adjust R1 to achieve the threshold voltage (Blue trace), such that when the green line goes above the blue line minus delay(see below) will set where the relay turns on(red trace), lighting up your light. When the green line goes below the now set blue line minus delay(see below) is where the relay turns off(red trace), turning off your light.
I have it here at 4.5 volts (maybe 1/8 of a tank) in the simulation below just for show and tell.
As seen in the plot....I put a "sloshing" delay to dampen things a tad, so you have about 15 sec's before the relay turns on when the gas goes below (voltage above) the threshold and about 10 sec's before it turns off when the gas goes above(voltage below) the threshold.
Radio Shack part numbers to follow later.......I have a date with some Chicken parts and BBQ'er
Relay : Catalog #275-241 $4.49
M1 : Catalog #55052763 $0.78
U3 : Catalog #276-1778 $3.14
U1 : Catalog #55053130 $4.46
R1 : Catalog #271-343 $2.99
C1 : Catalog #55047742 $4.39
C2 : Catalog #272-1436 $1.99
C3 : Catalog #272-1028 $1.49
Rx's : Catalog #271-003 $10.99
Vector Brd : Catalog #: 276-148 $2.00
Total : $36.72 + Labor
271-003 is the family pack of misc. resistors which will include what you need, buying them in bulk should save you $10.00 or $15.00.
I still suggest you buy what the dude has already made up I suggested up in post #16.......will save you a major headache unless you've done this before............steep'ish learning curve here.
But, if you make it, plz post it here or to a new thread for the board members that may be interested.
GL and may the force be with you.
