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PWM/README.md

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+# 🟧 Multi-Digital Pins
+
+### What are Multi-Digital Pins?
+
+Some modules use **more than one digital pin** to work properly. These pins allow the module to send or receive multiple signals at the same time—for example, controlling multiple LEDs, handling different colors, or measuring distance with precise timing.
+
+---
+
+### Included Modules:
+
+#### 🔌 Inputs:
+- [Ultrasonic Sensor](#module-01-ultrasonic-sensor)
+
+#### 💡 Outputs:
+- [RGB LED](#module-02-rgb-led)
+- [Traffic Light](#module-03-traffic-light)
+
+---
+
+### Module 01: Ultrasonic Sensor
+
+![](../Images/42.png)
+
+#### Block:
+
+![](../Images/45.png)
+
+This sensor reads **distance** from the physical world using ultrasonic sound waves. It uses **two pins**: one to trigger the signal and one to receive the echo.
+
+---
+
+### Module 02: RGB LED
+
+![](../Images/43.png)
+
+#### Block 1:
+
+![](../Images/46.png)
+
+This block controls the **red**, **green**, and **blue** channels using **ON/OFF** values.
+
+#### Block 2:
+
+![](../Images/48.png)
+
+This block controls the brightness of **red**, **green**, and **blue** individually, using values from **0 to 255** to mix custom colors.
+
+---
+
+### Module 03: Traffic Light
+
+![](../Images/44.png)
+
+#### Block 1:
+
+![](../Images/47.png)
+
+This block turns the **red**, **yellow**, and **green** lights **ON or OFF**.
+
+#### Block 2:
+
+![](../Images/49.png)
+
+This block allows you to adjust the **brightness** of the red, yellow, and green lights using values from **0 to 255**.
+
+---