Add the schematic description and remove the diagram.

Author: David Palma

ex00/README.md

@@ -1,6 +1,16 @@
 # Exercise 0
 
-This exercise consists in the simplest thing to do with an Arduino to see the physical output: blinking the on-board LED.
+This exercise consists of performing the simplest task with an Arduino to observe physical output: blinking the on-board LED.
+
+## Schematic Description
+
+This exercise does not require an external schematic as it utilises the built-in LED present on the Arduino board.
+
+### Built-in LED Description
+
+| **Component**    | **Pin/Connection** | **Arduino Pin** | **Description**                                                                 |
+|-------------------|--------------------|-----------------|---------------------------------------------------------------------------------|
+| **Built-in LED**  | LED_BUILTIN        | 13 (or equivalent) | The built-in LED blinks ON and OFF according to the delay values in the code.  |
 
 ## Code
 
@@ -21,3 +31,21 @@ void loop()
     delay(1000);                     // wait for a second
 }
 ```
+
+## Exercise Steps
+
+1. **Understand the On-Board LED**:
+   - The Arduino comes with a built-in LED, which is typically connected to the `LED_BUILTIN` pin. For most boards, this corresponds to pin 13.
+   - This exercise uses the built-in LED to create a simple blinking effect.
+
+2. **Upload the Arduino Code**:
+   - Copy the provided code for blinking the on-board LED.
+   - Open the Arduino IDE, paste the code, and upload it to the Arduino.
+
+3. **Observe LED Behaviour**:
+   - The on-board LED will turn ON for one second and OFF for one second in a continuous loop.
+   - Modify the `delay()` values in the code if you wish to change the blinking speed.
+
+4. **Experiment with Timing**:
+   - Adjust the `delay()` durations to make the LED blink faster or slower.
+   - Try adding additional logic, such as double blinking, to enhance the exercise.

ex01/README.md

@@ -2,11 +2,21 @@
 
 This exercise is the same as the previous one with the only difference that a led connected to pin 13 is used instead of using the built-in led.
 
-## Schematic
+## Schematic Description
 
-<p align="center">
-    <img src="./ex01_schem.png" height="503px" alt="Schematic"></img>
-</p>
+### Components and Connections
+
+| **Component** | **Pin/Connection** | **Arduino Pin** | **Description**                                                                 |
+|---------------|--------------------|-----------------|---------------------------------------------------------------------------------|
+| **LED**       | Anode              | 13              | Turns ON and OFF as programmed in the code to create a blinking effect.         |
+|               | Cathode            | GND (via Resistor) | Connects to ground through a 220Ω resistor to ensure safe current flow.         |
+
+### Schematic Description Table
+
+| **Connection**          | **Pin**      | **Purpose**                                                                                   |
+|--------------------------|--------------|---------------------------------------------------------------------------------------------|
+| LED to Arduino           | 13           | Controls the ON/OFF state of the LED based on the programme logic.                           |
+| LED to Ground (via Resistor) | GND          | Ensures safe operation of the LED by limiting current with a resistor.                       |
 
 ## Code
 
@@ -30,3 +40,22 @@ void loop()
     delay(1000);                 // wait for a second
 }
 ```
+
+## Exercise Steps
+
+1. **Connect the External LED**:
+   - Connect the anode of an LED to digital pin 13 on the Arduino.
+   - Use appropriate resistors (e.g., 220Ω) in series with the LED to limit current.
+   - Connect the cathode of the LED to the GND rail.
+
+2. **Upload the Arduino Code**:
+   - Copy the provided code for blinking the LED.
+   - Open the Arduino IDE, paste the code, and upload it to the Arduino.
+
+3. **Observe LED Behaviour**:
+   - The external LED connected to pin 13 will turn ON for one second and OFF for one second in a continuous loop.
+   - Modify the `delay()` values in the code if you wish to change the blinking speed.
+
+4. **Experiment and Modify**:
+   - Try connecting the LED to a different pin and update the `led_pin` value in the code accordingly.
+   - Experiment with different delay durations to observe variations in blinking speed.

ex01/ex01_schem.png

@@ -2,11 +2,21 @@
 
 This exercise makes use of array to turn ON and OFF multiple LEDs in sequence.
 
-## Schematic
+## Schematic Description
 
-<p align="center">
-    <img src="./ex02_schem.png" height="600px" alt="Schematic"></img>
-</p>
+### Components and Connections
+
+| **Component** | **Pin/Connection**   | **Arduino Pin** | **Description**                                                                               |
+|---------------|----------------------|-----------------|-------------------------------------------------------------------------------------------|
+| **LEDs (5x)** | Anode                | 9, 10, 11, 12, 13 | Indicates sequence by turning ON and OFF in an order defined by the programme logic.       |
+|               | Cathode              | GND (via Resistor) | Connects to ground through a 220Ω resistor to limit current.                               |
+
+### Schematic Description Table
+
+| **Connection**          | **Pin**      | **Purpose**                                                                                   |
+|--------------------------|--------------|---------------------------------------------------------------------------------------------|
+| LEDs to Arduino          | 9, 10, 11, 12, 13 | Controls the ON/OFF state of LEDs in a sequence as programmed in the code.                   |
+| LEDs to Ground (via Resistors) | GND          | Ensures safe operation of LEDs by limiting current with resistors.                           |
 
 ## Code
 
@@ -49,3 +59,21 @@ void loop()
     }
 }
 ```
+
+## Exercise Steps
+
+1. **Connect the LEDs**:
+   - Connect five LEDs to digital pins 9, 10, 11, 12, and 13 on the Arduino.
+   - Use appropriate resistors (e.g., 220Ω) in series with the LEDs to limit current.
+   - Connect the cathode of each LED to the GND rail.
+
+2. **Upload the Arduino Code**:
+   - Copy the provided code for sequential LED blinking.
+   - Open the Arduino IDE, paste the code, and upload it to the Arduino.
+
+3. **Observe LED Behaviour**:
+   - LEDs will turn ON and OFF in sequence from first to last and then from last to first.
+   - Adjust the `between_HL` constant in the code if needed to modify the delay between LED toggling.
+
+4. **Experiment and Modify**:
+   - Experiment with adding more LEDs or changing the sequence logic in the code.