🧠 Concept Overview 🌊 How Ultrasonic Distance Measurement Works The ultrasonic sensor sends a 10 µs pulse via the TRIG pin. The ECHO pin goes HIGH while the signal travels to the object and back. The duration (in microseconds) that ECHO stays HIGH is proportional to the distance. Speed of sound ≈ 343 m/s or 0.0343 cm/µs. Since the sound wave travels to the object and back, the formula is: Distance (cm) = (Time (µs) […]
🔐 Build a Simple Digital Door Lock Using 8051 and BuddyKit Hi buddies! 👋 In this class, we’re building a simple digital door lock system using the Buddy51 Mini development board. This project uses a 4×4 matrix keypad to enter a password and a relay connected to a digital pin to control the lock. The status of the door (Locked or Opened) is displayed on a 16×2 LCD screen. 📌 What You’ll Learn How to […]
Hi buddies! In our previous session, we saw how to create a counter using an LCD and a single key. In this class, we’ll learn about the working principle of a 4×4 Matrix Keypad. 🎛 What is a 4×4 Matrix Keypad? A 4×4 matrix keypad contains 16 keys arranged in 4 rows and 4 columns. These keypads are commonly used in password entry systems, calculators, and DIY electronics. 🔍 How It Works Each key press […]
Hi buddies!! In our previous class, we built a 7-segment display counter using an 8051 microcontroller. In this tutorial, let’s see how to display the same counter output on an LCD display. 📺 How Does an LCD Work? An LCD consists of three major parts: Backlight – A small LED that provides light behind the display. Liquid Crystals – These crystals align when voltage is applied, allowing them to either block or twist light. Polarizer […]
Hi buddies! In this tutorial, let’s learn how to create a simple 0–9 counter using a 7-segment display and an 8051 microcontroller. If you’re just getting started with embedded systems, this is a perfect project to understand digital output and counters! 🧠 What is a 7-Segment Display? A 7-segment display contains 7 individual LEDs arranged to form numbers from 0 to 9. These LEDs are named from a to g, and there’s sometimes an additional […]
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