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diff --git a/arduino/01-blink-a-led/Makefile b/arduino/01-blink-a-led/Makefile
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+DIR=01-blink-a-led
+A=blink-a-led
+
+include $(BASEDIR)/Makefile.assignment
diff --git a/arduino/01-blink-a-led/blink-a-led.md b/arduino/01-blink-a-led/blink-a-led.md
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+# Assignment: Blink a led
+
+
+## Goal
+
+Check that your local environment is working properly.
+
+## Step 1
+
+Create this schematic:
+
+![](schematic/assignment-1_schem.pdf)
+
+![](schematic/assignment-1_bb.pdf)
+
+The colors on the wires used does not matter. The resistors
+orientation is not important, but the LED's orientation is important.
+
+## Step 2
+
+Implement `setup()` and `loop()`. In `setup()` configure the LED pin and blink the LED in `loop()`.
+
+Use these functions:
+
+~~~ .c++
+
+Serial.begin(115200);
+Serial.println(string);
+
+pinMode(pin, mode);
+digitalWrite(pin, state); // HIGH or LOW
+delay();
+
+~~~
+
+## Tips
+
+* It is useful to print a startup message just to see when the
+  application has started.
diff --git a/arduino/01-blink-a-led/blink-a-led.pdf b/arduino/01-blink-a-led/blink-a-led.pdf
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+++ b/arduino/01-blink-a-led/blink-a-led.pdf
diff --git a/arduino/01-blink-a-led/schematic/assignment-1.fzz b/arduino/01-blink-a-led/schematic/assignment-1.fzz
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+++ b/arduino/01-blink-a-led/schematic/assignment-1.fzz
diff --git a/arduino/01-blink-a-led/schematic/assignment-1_bb.pdf b/arduino/01-blink-a-led/schematic/assignment-1_bb.pdf
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--- /dev/null
+++ b/arduino/01-blink-a-led/schematic/assignment-1_bb.pdf
diff --git a/arduino/01-blink-a-led/schematic/assignment-1_schem.pdf b/arduino/01-blink-a-led/schematic/assignment-1_schem.pdf
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+++ b/arduino/01-blink-a-led/schematic/assignment-1_schem.pdf
diff --git a/arduino/01-blink-a-led/solution/assignment-1/assignment-1.ino b/arduino/01-blink-a-led/solution/assignment-1/assignment-1.ino
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+++ b/arduino/01-blink-a-led/solution/assignment-1/assignment-1.ino
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+const int LED_PIN = D0;
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println();
+  Serial.println();
+  Serial.println("Hello world!");
+  pinMode(LED_PIN, OUTPUT);
+}
+
+void loop() {
+  digitalWrite(LED_PIN, HIGH);
+  Serial.println("HIGH");
+  delay(1000);
+
+  digitalWrite(LED_PIN, LOW);
+  Serial.println("LOW");
+  delay(1000);
+}
+