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Quick example how to blink an LED using LUA programming language

blinky.lua

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+local GPIO = require('periphery').GPIO
+local clock = os.clock
+local gpio_4 = GPIO(4, "out")
+
+function sleep(n)
+	local t0 = clock()
+	while clock() - t0 <= n do end
+end
+
+--function wait(seconds)  -- This function doesnt give real seconds
+--    local start = os.time()
+--    repeat until os.time() > start + seconds
+--end
+
+while 1
+	do
+		gpio_4:write(0)
+		sleep(2)
+--		wait(2)
+
+		gpio_4:write(1)
+		sleep(0.2)
+--		wait(0.2)
+	end