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libraries/Arduino_ESP32_OTA/examples/LOLIN_32_Blink/LOLIN_32_Blink.ino

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+/*
+ * Blink for LOLIN32 ESP32 board
+ *
+ * This sketch can be used to generate an example binary that can be uploaded to ESP32 via OTA.
+ * It needs to be used together with OTA.ino
+ *
+ * Steps to test OTA on ESP32:
+ *   1) Upload this sketch or any other sketch (this one will blink LOLIN32 blue LED).
+ *   2) In the IDE select: Sketch -> Export compiled Binary
+ *   3) Upload the exported binary to a server
+ *   4) Open the related OTA.ino sketch and eventually update the OTA_FILE_LOCATION
+ *   5) Upload the sketch OTA.ino to perform OTA
+ */
+
+void setup() {
+  // initialize digital pin 5 as an output.
+  pinMode(5, OUTPUT);
+}
+
+void loop() {
+  digitalWrite(5, HIGH);
+  delay(1000);
+  digitalWrite(5, LOW);
+  delay(1000);
+}