Hi.
I need to control 3 solenoid valves via USB port. Each valve needs about 200mA so I need some kind of buffer. I have found a board that acts as a buffer but it has a 4-6 mSec delay. **broken link removed** also has 4mSec delay.
I think I can do better if I use open collector transistors.
Can anybody point me to such board (I want to purchase it not to build it)?
Also, which is precision of USB signal that can be generated? I mean there are delays when the computer is busy?
I need to control 3 solenoid valves via USB port. Each valve needs about 200mA so I need some kind of buffer. I have found a board that acts as a buffer but it has a 4-6 mSec delay. **broken link removed** also has 4mSec delay.
I think I can do better if I use open collector transistors.
Can anybody point me to such board (I want to purchase it not to build it)?
Also, which is precision of USB signal that can be generated? I mean there are delays when the computer is busy?
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