I would like to build a modular synthesiser component (im thinking a step sequencer)Get in line
outputs a square wave that is in the range +/- 5.0V I would like to be able to detect when I get the rising edge to drive a clock.
Just put the signal through a diode and connect it to a digital input (and, of course, connect the two system grounds together). When the output is +5V the digital input will read high, when it is 0V or -5V it will read low. You may want to also connect a 10k resistor from the digital input to ground to have it turn off faster.
The Gadget Shield
: accelerometer, RGB LED, IR transmit/receive, speaker, microphone, light sensor, potentiometer, pushbuttons