Topic: GPIO pulse/tick counter
I would like to connect a flowmeter (http://www.swissflow.com/en/SF800/Flow_ … ifications) to my Infocast 3.5. Previously I have connected this meter to an interrupt line of an AVR to count pulses.
Frequency is fairly low at 100Hz to 2Khz
1) Is there a way to attach an interrupt to a GPIO pin to reliably catch rising or falling edges?
2) Is the 3.5 fast enough that I could just poll the GPIO for a pulse count at ~1Khz?
3) Is a GPIO even suitable for this purpose, or would I need some additional counter/accumulator IC in between the chumby and the flowmeter? If so, does anyone have any suggestions, perhaps one which supports i2c.