➀ The project presents a laptop-based HMI system using Arduino and L293D motor driver to control DC motor speed (5-36V) and direction via a GUI developed in Processing;
➁ The system replaces traditional switches/potentiometers with serial communication, enabling commands for forward/reverse motion, stop, and PWM-based speed control (3-255);
➂ Requires minimal hardware: Arduino Uno, motor driver, external power supply, and a USB connection for GUI-motor interaction.
➀ The article provides a step-by-step guide to building a flight tracker using a Raspberry Pi and an SDR receiver, leveraging ADS-B signals from aircraft;
➀ It details configuring software like FlightRadar24 or OpenSky to decode flight data and display real-time tracking via web interfaces;
➂ The setup involves antenna optimization, signal filtering, and sharing flight data with global networks for enhanced coverage and accuracy.
➀ The Senior Pillbox is a low-cost electronic system designed to automate medication reminders for elderly or home-bound patients using 555 timers and a CD4017 counter;
➀ It provides both visual (daily LED indicators) and audio alerts, with adjustable intervals (24-hour cycles) and a 10-second alert duration, isolated via an optocoupler to reduce noise irritation;
③ The prototype demonstrates a simplified 10-second interval for testing, requiring minimal setup beyond weekly pill refilling and continuous power supply.
➀ The article introduces a compact FM radio designed to fit inside an earbud, using the RDA5807M IC for preset frequency tuning and volume control;
➀ The device can function as a basic single-channel FM radio or a long-range spy receiver when paired with a transmitter;
➂ The project involves programming the IC, assembling components (battery, speaker, and module) into an AirPods-style case, with future plans to integrate a microcontroller for advanced control.
➀ A DIY circuit using an LM358 op-amp and light-dependent resistor (LDR) automatically switches on lights at dusk and turns them off after 2–6 hours, reducing energy waste.
➁ The system employs a super capacitor for timing control, adjustable via potentiometers to set light sensitivity and shut-off duration, mimicking human presence for security.
➂ Includes PCB design guidelines, calibration steps, and operates independently without manual reset, ideal for unattended homes or outdoor lighting.
➀ A compact GSM-based spy device is introduced that can monitor conversations over long distances, even internationally.
➁ The device is designed to be easily concealed due to its small size and can transmit audio when a specific phone number is dialed.
➂ The project requires components such as an IndusBoard Coin, SIM800L GSM module, Li-Po battery, and microphone module, along with specific code to manage the device's functionality.
➀ An IR remote switch is a wireless device that uses infrared signals from a remote control to operate electrical appliances, commonly used in home automation.
➁ The system consists of an IR receiver module, a signal processing circuit, and a relay to control the connected load.
➂ A standard IR remote control can be used, and the circuit diagram and parts list are provided for building the IR remote switch.
➀ The article provides a step-by-step tutorial on building a function generator using the ICL8038 IC. This generator can produce square, sine, and triangular waveforms up to 100kHz.
➁ The core of the function generator consists of an oscillator that generates different waveforms, which are then shaped by wave-shaping circuits.
➂ The breadboard prototype demonstrates the functionality, with the sine waveform output captured on an oscilloscope.
