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arduino-cli/libraries/Adafruit_seesaw_Library/examples/digital/blink/blink.ino

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+/*
+ * This example shows how to blink a pin on a seesaw.
+ * Attach the positive (longer lead) of the LED to pin 15 on the seesaw, and
+ * the negative lead of the LED to ground through a 1k ohm resistor.
+ */
+
+#include "Adafruit_seesaw.h"
+
+Adafruit_seesaw ss;
+
+void setup() {
+  Serial.begin(115200);
+  
+  if(!ss.begin()){
+    Serial.println("ERROR!");
+    while(1);
+  }
+  else Serial.println("seesaw started");
+
+  ss.pinMode(15, OUTPUT);
+}
+
+void loop() {
+  ss.digitalWrite(15, HIGH);   // turn the LED on (HIGH is the voltage level)
+  delay(1000);                       // wait for a second
+  ss.digitalWrite(15, LOW);    // turn the LED off by making the voltage LOW
+  delay(1000);  
+}