Want to make a MPG display using the Arduino. I will have a Distance Pulse input and a Fuel Pulse input both will be 5vdc. I am faced with the following conditions that I do not know how to do. Also I have other routine’s that need to be run at the same time. I will have three outputs to an LCD, current MPG, Trip MPG and an overall MPG. Need to read Distance & Fuel inputs in real time and store the readings as variables (cannot miss any pulses). Will need to store and read 4 or 5 variables that will NOT be reset or cleared when the Arduino is turned off. Whatever storage is suggested I want to be able send or read whole numbers and not have to break it down or read binary or Hex format. Thanks for the help.

MPG Arduino

Want to make a MPG display using the Arduino. I will have a
Distance Pulse input and a Fuel Pulse input both will be 5vdc. I am faced with
the following conditions that I do not know how to do. Also I have other routine’s
that need to be run at the same time. I will have three outputs to an LCD,
current MPG, Trip MPG and an overall MPG.

Need to read Distance & Fuel inputs in real
time and store the readings as variables (cannot miss any pulses).
Will need to store and read 4 or 5 variables that
will NOT be reset or cleared when the Arduino is turned off. Whatever storage
is suggested I want to be able send or read whole numbers and not have to break
it down or read binary or Hex format.

Thanks for the help.

0 kevjose over 12 years ago

For the first application I would've used Interrupt pins on Arduino (Arduino Playground - Interrupts)

As for storing data after the board is turned off. You could use EEPROMWrite (Arduino - EEPROMWrite) or you could attach an SD card to your setup to store values. I would suggest the former solution as you need to store only very small amounts of data.

This might be useful. Arduino Tutorial #13: Internal EEPROM - YouTube
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