Hi
I have a requirement to accurately measure how much fuel I've used in an endurance race car.
The data logger I have does not accept a frequency input, so I need to convert our flow meter from pulse to voltage so this can be
fed into the logger.
The flow meter has a power free reed switch that pulses @ 1 pulse per 0.005 litre.
The data logger has an input that I can use that is 2-12 volt dc.
The requirement is to have the ability to measure 100litres of fuel.
Therefore 20,000 pulses = 100l and for this to be converted to a voltage of between 2-12v so:
100 pulses = 0.5l = 2.05v
200 pulses = 1.0l = 2.1v
1,000 pulses = 5l = 2.5v
10,000 pulses = 50l = 7v
20,000 pulses = 100l = 12v
The other requirement to have is to be able to reset the pulses/voltage back to 0 pulses / 2v so when the car is refueled, I can hit a button
and start again from 0 litres.
I would also like the current voltage to be no-volatile so should the car be switched off/loose power for a period of time, the current flow is not reset.
Seen some ideas using an LM331 chip, but have no idea how to implement?
Any idea?
Thanks
I have a requirement to accurately measure how much fuel I've used in an endurance race car.
The data logger I have does not accept a frequency input, so I need to convert our flow meter from pulse to voltage so this can be
fed into the logger.
The flow meter has a power free reed switch that pulses @ 1 pulse per 0.005 litre.
The data logger has an input that I can use that is 2-12 volt dc.
The requirement is to have the ability to measure 100litres of fuel.
Therefore 20,000 pulses = 100l and for this to be converted to a voltage of between 2-12v so:
100 pulses = 0.5l = 2.05v
200 pulses = 1.0l = 2.1v
1,000 pulses = 5l = 2.5v
10,000 pulses = 50l = 7v
20,000 pulses = 100l = 12v
The other requirement to have is to be able to reset the pulses/voltage back to 0 pulses / 2v so when the car is refueled, I can hit a button
and start again from 0 litres.
I would also like the current voltage to be no-volatile so should the car be switched off/loose power for a period of time, the current flow is not reset.
Seen some ideas using an LM331 chip, but have no idea how to implement?
Any idea?
Thanks