Keypads are a very commonly used input device in microcontroller-based systems. In a keypad, multiple switches are arranged in rows and columns so that they could be interfaced to a microcontroller with a minimum number of I/O pins. For example, a 12-key keypad is arranged in a 4×3 format, which allows to interface the 12 […]
2-Wire Keypad Interface Using a 555 Timer using PIC16F628A Read More »
Matrix keypads are very useful when designing certain systems which needs user input. These keypads are constructed by arranging push button switches in rows and columns as shown in Fig.1. Scanning keypad to detect pressed keys involves several steps and there are several methods to achieve this. The method presented here is capable of detecting
Matrix Keypad interfacing with PIC microcontroller. Read More »
Spooky Led Lamp This is a hollowed out light bulb filled with fluorescent liquid and two UV leds plus one red led immersed in the liquid. When turned on the light bulb flickers for a while then starts to pulsate randomly with the UV leds giving a spooky but rather nice look. The bulb is
Spooky Led Lamp using PIC12F675 microcontroller Read More »
This project is one another thermometer application that uses the TCN75A digital sensor from Microchip. The sensor provides digital temp conversion in the range -40°C – 125°C (-40°F – 257°F) and has maximum resolution 0.0625°C. However, the LCD that I used (2.5 digits model LCD-S2X1C50TR manufactured by Lumex) only works reliably in the temperature range
Driving LCD directly from PIC Read More »
Over the last few months I have prototyped and built a water tank level sensor for my 9000L rain water tank. The design is based entirely on Silicon Chip’s PIC-Based Water-Tank Level Meter, but instead of programming PICs, I prototyped using an arduino, and built the final version using PICAXE microcontrollers. The sensor consists of
Wireless PICAXE-based water tank level sensor Read More »
The goal of the electrical design was to streamline an automatic shift control while keeping manual user input in a fast, user-friendly way, incorporating Advanced Electrical Subsystem Control. The electrical design was driven by the complexity required by the mechanical system. The system takes in rider input in the form of a throttle position sensor,
Electrical Subsystem Read More »
The new PIC18F2550 Project Board was designed as the development platform for student projects. The board features MCU: PIC18F2550 with external xtal, ADC: one channel 0-2.5V sigma-delta converter, Linear Technology LTC2400/LTC2420, 6-channal 10-bit ADC 0-5V, Display: Two connectors for text LCD or GLCD, USB: onchip USB port with type B connector, Power supply: onboard low
pic18f2550 Microcontroller Project Board Read More »
The Original Build Back in 2009 I build my first copy of a “worlds most useless machine” from a video I found on wimp.com, it is no longer posted, which was a copy of the real original by Claude Shannon called the ultimate machine. The original box was built quickly over the course of one
Worlds Most Useless Machine Rebuild Read More »
An extremely simple and low-cost Sine/Square wave generator, known as the “Custom Function Generator,” is developed based on the Analog Devices AD9835 Direct Digital Synthesis (DDS) Generator chip.. The frequency can be set for any frequency from 1Hz to 10MHz in 1Hz resolution steps! All this with three push buttons and a novel “sliding window”
Another DIY function generator using PIC16F628 Read More »
Intro: How to use a 74HC595 Shift Register with a AVR ATtiny13 If you have been playing with microcontrollers and electronics then you have likely seen LED dot matrix displays and other projects that use shift registers like 7-segment displays and more. This instructable goes over a quick intro to the 74HC595 8-Bit Serail to
How to use a 74HC595 Shift Register with a AVR ATtiny13 Read More »
