init

LICENSE

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+This code is released under the DWTW license
+
+This program is free software; you can redistribute it and/or modify it under the terms of the Do What Thou Wilt License.
+
+Boundless Public License
+DO WHAT THOU WILT
+TO PUBLIC LICENSE
+
+Version 2.55
+
+Everyone is permitted to copy and distribute verbatim or modified copies of this license document, and changing it in full or in part is allowed without any restrictions.
+
+TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+0. Do what thou wilt shall be the whole of the Law.
+
+DWTWL – a license with a single requirement: DO WHAT THOU WILT
+
+The license provides more freedom than any other one (such as GPL or BSD) and does not require saving the license text on copying.
+
+DWTWL – an accomplished and eligible license for free text, code and any other symbols (including the software, documentation and artwork).
+
+The license does not contain a "no warranty" clause. DWTWL can be used in countries that do not legally acknowledge the transition to public domain.
+
+Summary:
+
+An author-creator gives their source code to the world for free, without becoming distracted by worldly thinking regarding how and why the others will use it.

README.md

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+Arduino nano, Motion sensor and Relay with transformerless power supply
+======
+
+![motionsensorrelay](https://dev.ussr.win/microcontrollers/motionsensorrelay/raw/branch/master/motionsensorrelay_bb.jpg)

motionsensorrelay.ino

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+const int lightDelay = 90000;
+const byte movePin = 3;
+const byte relayPin = 4;
+long lastmoveMillis = 0;
+
+void setup() {
+    pinMode(movePin, INPUT);
+    pinMode(relayPin, OUTPUT);
+    digitalWrite(relayPin, HIGH);
+}
+
+void loop(){
+  if (digitalRead(movePin) == 1) lastmoveMillis = millis();
+  delay(100);
+  if (lastmoveMillis > 0) activateRelay();
+}
+
+void activateRelay() {
+  if ((millis() - lastmoveMillis) < lightDelay) digitalWrite(relayPin, LOW);
+  if ((millis() - lastmoveMillis) > lightDelay) {
+    digitalWrite(relayPin, HIGH);
+    lastmoveMillis = 0;
+  }
+}