iButton electronic locks
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Handy Cricket Hardware Description
This document presents an overview of the hardware design of the Handy Cricket.
The Handy Cricket is a compact electronic device designed for educational and recreational purposes, primarily aimed at children. The hardware design incorporates various components that work together to...
How to Design Battery Charger Applications that Require External Microcontrollers and Related System-Level Issues
Application note on designing linear and switch-mode (switching DC-DC converter current source) battery charger applications that require external microcontrollers and related system-level issues for notebook computers.
The application note provides guidance on the design of both linear and switching DC-DC converter...
Home Security System
This alarm circuit activates when switches S1 through S5 are engaged. This action illuminates LED1 and triggers transistor Q1 through integrated circuits IC1C and IC1D. Relay RY1 is configured for self-latching. Switch S10 is utilized for resetting the circuit. When...
MICROCONTROLLER BASED AUTOMATIC ROOM LIGHT CONTROLLER
This project involves an automatic room light controller with a bidirectional visitor counter using a microcontroller. It is designed to manage room lighting and accurately count the number of individuals present. When a person enters the room, the counter increments...
GSM Remote Control 2 IN and 2 OUT Part 2 Schematic
The control of the system is managed by a Microchip PIC18F46K20-I/PT microcontroller, which is programmed with firmware to oversee the activity of the GSM/GPRS module, monitor the logic conditions of two opto-isolated inputs, and send commands to two relays within...
Sensor Circuit Of Analog Line Follower Robot
The following circuit illustrates the sensor circuit of an analog line follower robot. Features include control by a microcontroller and a sensor circuit.
The sensor circuit for an analog line follower robot is designed to detect the presence of a line...
Interface a uC to PC RS232 with MAX232A
This document outlines the standard configuration for interfacing a microcontroller, such as the 8051, with a PC using RS232 through the MAX232A. The UART or serial port was absent in the 8049 and 8749 microcontrollers, which were predecessors to the...
Key Code Combination High Security Door Lock
This project involves an electronic lock that supports numerous combinations, which can be easily modified. It unlocks only with the correct sequence of four consecutive numbers. A significant feature of this electronic lock is that the four numbers must be...
Low Resource Microcontroller 3 Phase BLDC Motor Speed Controller
This article discusses a minimal resource microcontroller implementation for a three-phase Brushless DC (BLDC) motor, focusing on a closed-loop speed motor controller application based on a Microchip PIC12 device. It demonstrates how minimization techniques can reduce the number of I/O...