Digital I-O Board in Serial Mode – Byte back to individual Bit

T-town

I've been messing around with my Parallax Digital I-O board model 27113 http://www.parallax.com/product/27113 using the serial interface. I am using the Parallax sample code they provided. Can someone give me an example of how to take the "optos" byte sent from the inputs (in the sample code) and convert that into 8 individual bits that represent each input? Ditto for the "index" byte to the outputs. I’ve been able to read a single input and force an output but only using the octal number (If optos = 1 then….2, 4, 8….). I’m thinking there has to be an easy way to convert the 255 combinations back to 8 bits I can use in code. Keeping the explanation simple would be appreciated. I’m pretty new to this. Thanks as always. Joe

Sapphire

You could use the .BIT modifier to get the individual bits of the two bytes:

optos.BIT0 ' this is the first bit
optos.BIT1 ' this is the second bit
optos.BIT7 ' this is the last bit

Same goes for index.

IF optos.BIT2 = 1 THEN     ' do something if bit 2 is on

index.BIT4 = 0   ' set output bit 4 off
index.BIT7 = 1   ' set output bit 7 on

T-town

Perfect, thank you. I declared variables for each of the input and outputs using the .bit. Working great; thanks for the nudge in the right direction!