Hi there,
I hope everyone is doing well. I'm doing a small project using RedLab
1208LS as IO. I have 8 digital outputs and 4 digital inputs. I have
attached pin configuration in attachment. I'm using A0-A7 for outputs
and B0-B3 for inputs.I have also programmed everything and it seems
working only issue I'm having is with inputs. Further my explanation
RedLab only works with 5V max. so if signal 2V-5V it will recognise as
HIGH, if signal 0.8V-0V it will recognise as LOW and anything in-between
.8V-2V will be ignored. My input signals are designed for 24V so I had
to bring it down to 5V. I'm using 2 resistors 10k & 39k to turn 24V to
5V but when I plug that 5V signal into B0 or B1 or B2 or B3 it won't
show any input as once I plug that 5V signal it eats the all voltage and
dropping it to 0. But when I use RedLab internal 5V supply as input in
B0-B3 is shows input. So I don't know why it doesn't show when I plug my
inputs that also has 5V (24V brought down to 5V using 10k & 39K ohm
resistors) it won't show any input. I have tried everything but it
doesn't seem to work and I stuck for weeks now. Anyone had similar
problem or can help me sort out my issue will be much appreciated. I'm
assuming low current could be the issue but don't get how it shows input
when I use internal 5V (Redlab has 5V internal supply from pin 30) as
input but wouldn't show when I plug in my input. I was thinking to
attach 1208LS data sheet but I thought it would be too much to read.
Please someone help me...Thanks in advance.