Tire pressure and Fuel tank level measurement

Hi guys . im making a project that will measure the tire and fuel status . i dont want to buy kits . i want to make it on my own . im having a problem on what sensor to use on both of them . do you have any suggestion ? Im using a motorycycle .

The question you could ask is HOW?

What are different ways to measure (estimate) the pressure of my tires? - pressure sensor? obvious :) - microphone? Sound might differ? - distance sensor? if the pressure is too low the bottom of my car is closer to the road. - vibration sensor? ...

What are different ways to measure (estimate) the level of my fuel? - distance sensor? - floating thing? - volume in/out sensors? - weight sensor? - conductivity ? no, too dangerous

Also important is how accurate you want the measurements and how precise, how often measure?

Does your car have tire pressure sensors or do you intend to add sensors to your tires? They seem to use RF transmission to tell the car the pressure. I don't know how to receive such information though.

liudr: Does your car have tire pressure sensors or do you intend to add sensors to your tires? They seem to use RF transmission to tell the car the pressure. I don't know how to receive such information though.

I'm almost certain the protocols are going to be proprietary for each manufacturer.

I remember seeing big rig truck drivers at rest stops, thumping their tires with a stick. The tire would probably resonate at different frequencies depending on pressure. The sensor in their case was an ear.

liudr: Does your car have tire pressure sensors or do you intend to add sensors to your tires? They seem to use RF transmission to tell the car the pressure. I don't know how to receive such information though.

im placing the sensors on a motorcycle . my motorcycle does not have a tire pressure sensor.

Then how do you plan to sense tire pressure? Fuel tank maybe easier, tap into your fuel gauge.

im planning to use gauge pressure sensor . but i cant seem to find the right gauge pressure sensor . for the fuel tank . is it possible to tap it to the fuel gauge ? how ? im just a student .

Depending on the age of the motorcycle, the fuel gauge is likely to be just a voltage. Find the gauge on the instrument cluster and measure the voltage on each pin when the tank is full and empty. Write it down.

Then you will find one pin that has a different voltage when it's full and empty. A voltage divider will be required to step this down to the Arduino's maximum 5V range but then it's easy to put that in to an analog input.

Freescale make some neat pressure sensors. Have a look at their MPXV range. There might be something useful there. Powering the sensor is going to be the problem. Those Freescale sensors will work with a battery but not with an RFID tag.

the mpxv series can only measure -2 to 2kpa i think its not enough to measure the tire pressure .. spd100g can measure 0-90 psi .. is ok to use spd100g ? thank you for the help sir