-- download at MT.QZX.COM (counter.lua)

local c = 3 -- pulse and reset after C input pulses
local o = "c" -- output pulse when reset
local i = "d" -- input signal to count
local s = "b" -- on/off switch or pressure plate

if not mem.n then
	mem.n = 1
elseif event.iid == "lo" then
	port[o] = false
elseif event.type == "on" and pin[i] and pin[s] then
	mem.n = mem.n + 1
	if mem.n > c then
		mem.n = 1
		port[o] = true
		interrupt(1, "lo")
	end
end