bison
Newbie level 6
pull up resistor relay
Hi and thanks for looking into the attached diagram.
On the left side (green) is a digital downcounter board. The output is open collector, normally high and goes (and stays) low when the counter reaches zero.
On the right side (yellow) is a relay driver board.
The relay must be activated while the counter runs and disactivated when the counter reaches zero.
- Did I choose the right input (rising flank)?
- What is the best value for the pullup resistor Rp? I thought around 1K/.5W, but I'd like to ask you how to find the right value, not by trying but by looking into the diagram.
Hi and thanks for looking into the attached diagram.
On the left side (green) is a digital downcounter board. The output is open collector, normally high and goes (and stays) low when the counter reaches zero.
On the right side (yellow) is a relay driver board.
The relay must be activated while the counter runs and disactivated when the counter reaches zero.
- Did I choose the right input (rising flank)?
- What is the best value for the pullup resistor Rp? I thought around 1K/.5W, but I'd like to ask you how to find the right value, not by trying but by looking into the diagram.