Hi,
I need to build a fan that can blow a fixed amount of air through a pipe, but hitting that amount can be problematic.
wondering if anyone can give me a hand on designing a simple circuit that has:
electric fan (about 20mm pc fan, needs to pass upto 20 litres a second)
veriable speed control (so i can slow it down as it get close to the correct volume)
some way of monitring the flow (accurecy to 1 liter)
some calibration ability
I was thinking of a simple pwm circuit with a counter to count the pulses and use that to tell how much air has passed
any help will be appreciated
Kind regards
K Rayton
