I have 5x pushbuttons and any one can be pushed at any time I want to capture "button pushed" with a cheap datalogger like OM-EL-USB-3 0-30vdc single channel. It will record only every minute so I need a circuit to capture the button push. I was thinking of 5 x 555 1.5 minute monostables with a differant voltage devider on each output and this connected to the logger via diodes. Any better ideas please?