What’s this? The circuit here described is a simple 4×5 keypad that can be used in particular with the PIC 16F877 microcontroller, for which it has been designed considering a supply of 5V, 16F877 I/O pins leakage current, the voltage level recognized as a high or low state while in TTL or ST mode, etc.. …
Keypad 4×5 for microcontrollers v. 1.1 using PIC16F877 Read More »
Simple method for creating a custom button keypad that doesn’t require separate hardware.  Just your microcontroller buttons a few resistors. What we have here is 9 buttons and 6 signal lines (3 inputs, 3 outputs).  The basic setup is in a grid pattern where the three input lines come down as columns (PIN0, PIN1, and PIN2),  and …
An electronics enclosure with HMI ( I2C LCD and keypad) for projects with sensors and relays. Good for any MCU, Arduino, Beaglebone,AVR I have searched the net high and low to find a professional looking enclosure with an HMI (Human Machine Interface) that I could use in my project involving sensors and relays, but I …
Arduino, Beaglebone, MCU enclosure with HMI (LCD & keypad) Read More »
This post provides a simple method to interface any keypad (e-g 4×4 or 4×3 etc)Â with PIC12F675 microcontroller. The code for PIC12F675 is written in C language using MPLAB with HI-TECH C compiler. You can download this code from the ‘Downloads‘Â section at the bottom of this page. In this post, it is assumed that you know, …
Open electrical doors with your secret code only! Here are the technical specifications: Up to two keypads may be connected to drive both relay outputs. Professional, outdoor or other keypads may be used. Relay outputs are configurable: output voltage +6 to +24VDC (from power input) or simple switch emulation. The small LCD is optional, and …
Dual programmable keypad code lock using PIC18F452 Read More »
Digital electronics and Analog electronics doesn’t mix easily. A Microcontroller can’t get analog values unless an Analog-to-Digital converter is used, however, you may find a little complicated the use of an ADC and it need lots of Input/Output ports. Some Microcontrollers, like the small 8-pin Microchip PIC 12F675, do have an ADC integrated, but …
Read analog values without an ADC using PIC12F675 microcontroller Read More »
This post provides a simple method to interface any keypad (e-g 4×4 or 4×3 etc)Â with PIC16F84AÂ microcontroller. This code is written in C language using MPLAB with HI-TECH C compiler. You can download this code from the ‘Downloads‘Â section at the bottom of this page. In this post, it is assumed that you know, how to interface …
This PIC microcontroller tutorial provides a simple method to interface any keypad (e-g 4×4 or 4×3 etc)Â with PIC16F877 microcontroller. This code is written in C language using MPLAB with HI-TECH C compiler. You can download this code from the ‘Downloads‘Â section at the bottom of this page. In this post, it is assumed that you know, …
I2C keypad This instructable explains how to interface with a 4×4 keypad over an I2C bus. I started this project because I wanted some plug and play input and output modules for easy and fast prototyping of my electronics projects (mostly with PIC microcontrollers). Of course you can use leds and dip switches but they require lots …
AT89C51 Scrolling LED Circuit Operation: Keypad’t the values ​​entered the program through is continually monitored, “*” key is pressed unless the display of the first letter that section required all letters appear, but the desired letter or number after… Electronics Projects, AT89C51 Keypad Controlled Scrolling LED Dot Matrix Text “8051 example, avr project, keil example, microcontroller projects, AT89C51 …
AT89C51 KEYPAD CONTROLLED SCROLLING LED DOT MATRIX TEXT Read More »
