Lookup Tables

[BH_epuk]

Have you considered the MCP9700 temp sensor from Microchip.
About to use one on a project myself, Cheap £0.22 @10off in farnell and hopefuly a lot less coding than a Thermistor.

[shawn]

Thanks guys for posting.
That helped me understand the lookup table.
Would it be faster and take up less code if I placed the table inside of an eeprom. Also to get the resolution I want over the temp. range I want, I think I am going to switch to a mcp 3202 12bit ad chip.

Another question for ya all. If I am reading a temp of 70.8 is it possible to store that in a 1 byte memory location. How I handle this now is to put the 70 in the high byte of a word variable and I put the .8 in the low byte.This works very well but doubles the memory requirments.

Thanks to You all
Nick

[mackrackit]

A correction to my not so good example

'Lets say 
TXI = 0
GOSUB D_INDEX
' Now TXIU will hold the value 2500

" If Index is zero, Var is set to the first Value."

Would it be faster and take up less code if I placed the table inside of an eeprom.

Faster-- No, it takes time to read the EEPROM. Less code-- Probably yes.

If I am reading a temp of 70.8 is it possible to store that in a 1 byte memory location.

Not that I can think of.

[Darrel Taylor]

Storing 1024 WORD values in LOOKUP2 statements would take over 8K words of program space.

But using the technique described here ... http://www.picbasic.co.uk/forum/show...php?t=3891#LAB
You can do it with just over 1K.

Faster, smaller, no external parts.