wip

2 files changed, 20 insertions, 6 deletions

diff --git a/assignments/blink-a-led/blink-a-led.md b/assignments/blink-a-led/blink-a-led.md
index a08bc4e..72bbb9c 100644
--- a/assignments/blink-a-led/blink-a-led.md
+++ b/assignments/blink-a-led/blink-a-led.md
@@ -6,10 +6,19 @@ Check that your local environment is working properly.
 
 ## Configure the Arduino IDE
 
-Under *Tools* -> *Board* make sure that "NodeMCU 1.0 (ESP-12E Module)"
-is available and selected.
+1. Make sure the "ESP8266" core is installed. If it is not installed
+   follow the installation instructions:
 
-Create a new sketch with *File* -> *New* and compile it with *ctrl-R*.
+   [https://github.com/esp8266/Arduino#installing-with-boards-manager](https://github.com/esp8266/Arduino#installing-with-boards-manager)
+
+1. Under *Tools* -> *Board* make sure that "NodeMCU 1.0 (ESP-12E
+   Module)" is available and selected.
+
+1. Select the correct serial port: *Tools -> Port*.
+
+1. Select the highest upload speed: *Tools -> Upload Speed*.
+
+1. Create a new sketch with *File* -> *New* and compile it with *ctrl-R*.
 
 ## Step 1
 
@@ -24,7 +33,7 @@ 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()`.
+Implement `setup()` and `loop()`: In `setup()` configure the LED pin and blink the LED in `loop()`.
 
 Use these functions:
 
@@ -32,9 +41,14 @@ Use these functions:
 Serial.begin(115200);
 Serial.println(string);
 
+// Pin is D1/D2/D..
+// mode is INPUT or OUTPUT
 pinMode(pin, mode);
-digitalWrite(pin, state); // HIGH or LOW
-delay();
+
+// HIGH or LOW
+digitalWrite(pin, state);
+
+delay(ms);
 ~~~
 
 ## Tips
diff --git a/assignments/blink-a-led/blink-a-led.pdf b/assignments/blink-a-led/blink-a-led.pdf
index da370c4..655f964 100644
--- a/assignments/blink-a-led/blink-a-led.pdf
+++ b/assignments/blink-a-led/blink-a-led.pdf