Hello,
I'm wanting to design an adapter box for the fuel level sensor in my racecar. I've stripped the factory wiring and dash and am installing all new Motec gear. I need to convert the fuel level signal to 0-5V to suit the analog inputs of the ECU. I was planning on building a small voltage divider circuit and installing this in to a small enclosure, then potting the enclosure with 2 flying leads with DTM connectors.
The fuel level sender is a float arm attached to a variable resistor. The resistance at full is 4 ohms, and the resistor at empty is 120 ohms. Therefore, I have worked out that I need a fixed resistor of 170 ohms to achieve a pretty close to 0-5V, if I use a regulated 12V supply.
Here's where I need some help. How would I incorporate a regulator to the circuit to ensure the voltage is fixed at 12V when the vehicle is charging, and how do I add filtering to the box in the event of sloshing moving the arm around - I want it to be slow acting, just as the factory fuel level gauge is.
Any help much appreciated!
I'm wanting to design an adapter box for the fuel level sensor in my racecar. I've stripped the factory wiring and dash and am installing all new Motec gear. I need to convert the fuel level signal to 0-5V to suit the analog inputs of the ECU. I was planning on building a small voltage divider circuit and installing this in to a small enclosure, then potting the enclosure with 2 flying leads with DTM connectors.
The fuel level sender is a float arm attached to a variable resistor. The resistance at full is 4 ohms, and the resistor at empty is 120 ohms. Therefore, I have worked out that I need a fixed resistor of 170 ohms to achieve a pretty close to 0-5V, if I use a regulated 12V supply.
Here's where I need some help. How would I incorporate a regulator to the circuit to ensure the voltage is fixed at 12V when the vehicle is charging, and how do I add filtering to the box in the event of sloshing moving the arm around - I want it to be slow acting, just as the factory fuel level gauge is.
Any help much appreciated!