signal void AnaloguePlus (void)
{
ain0 = ain0 +0.1;
twatch(20);
}

signal void AnalogueMinus (void)
{
ain0 = ain0 -0.1;
twatch(20);
}

KILL BUTTON *
DEFINE BUTTON "VOLTS +","AnaloguePlus()"
DEFINE BUTTON "VOLTS -","AnalogueMinus()"