Hi, I am trying to wire MQ-7 ( http://www.sgbotic.com/products/datasheets/sensors/MQ-7.pdf ) with Arduino but it doesn't seem to be working. MQ-7 requires a pulse of 1.4V for 60 seconds and 5V for 90 seconds. By calculation the pulsewidth should be 255 for 60 seconds and and 71.4 for 90 seconds. H…

MQ-7

zeus2kx January 20, 2012, 7:26pm 2

Hello,
Anyone to help me?

Thanks.