A/D converter -- picaxe18X

[mccarthym]

After the following declaration
symbol adc= input2

the instruction
readadc adc,b1

appears not to convert but gives only a 0 or 255 return to b1.

If the the declaration is removed and the instruction is

readadc 2,b1 then conversion appears to occur as expected.

If a declaration is made for an input, does this then force it as a digital input and cannot be used as an analogue input?

 

[hippy]

The problem is that you are trying to do "READADC input2,b1" to determine which channel to read it uses the value specified from 'input2' which will be 0 or 1 depending on whether the digital input is set or not, and it will then read analogue channel 0 or 1 respectively.

What you want is "SYMBOL adc = 2" at the top.

Edited by - hippy on 1/20/2004 10:42:44 PM