plz help me (define the character from adc reading)

[Guest]

hi

i have problem in writing the code

i need to write a code that read reading from 3 sensors (2 pressure sensors and 1 water sensor)

from these 3 sensors, the signals will receive by one transmitter before entering pic.

when entering pic, it will converted to digital form (using built-in adc converter) and comparing the with certain values for the next action

before this i write reading the value sequentially from the sensors.(I mean from sensor 1, then sensor 2, then sensor 3; by some delay) but to implement this i must put timer on the transmitting circuits to on and off the transmitter sequentially.but my supervisor reject this way.

he ask me to write a program that read all the sensor at the same time and after converting the signal to digital form, to differentiate the readings, i must able to differentiate it character by character. i need to separate the reading because different sensor has different minimum values.

i don't know to do this. can anybody help me.

this is what i done previously.

[jecottrell]

I assume your supervisor has a problem with the 'delay_ms(5000)' between each reading? And you only read AN0. Are you saying that you have all three sensors muxed into AN0?

While you can't get a simultaneous AD reading on three channels, you can get them fairly quickly. The datasheet will show you how to calculate the acquisition times... usually tens of microseconds each, or so.

More info about your hardware would help, more info about your code would help, and PIC part number and speed is also good to provide....

John

[Guest]

[jecottrell]

Sorry,

Can't help much without a clear and accurate description of what your hardware configuration is. Until you take the time to describe in detail what parts you are using, how they are connected, etc. No one is going to be able to help you.

John