Content for 20x4 LCD

20x4 LCD

This is a basic 20 character by 4 line display. Utilizes the extremely common HD44780 parallel interface chipset (datasheet). Interface code is freely available. You will need ~11 general I/O pins to interface to this LCD screen. Includes LED backlight.

High Precision Digital AC Energy Meter Circuit Voltage-Current-Power-KWh

“Disclaimer: Some parts of this circuit carry dangerous Mains voltage. Be careful with your experiments. If you are a beginner, ask some experienced users to guide you. Dealing with the 220V-AC mains voltage and measuring the AC loads’ true …

Arduino Combination Safe

“Rotate the potentiometers in the correct sequence to access system! Ever watched the movie ‘Army of Thieves’ on Netflix? This project was inspired by how the character in the movie open the vaults, and how intricate the combination locks on …

3-Axis Magnetometer

“Measure the magnitude and direction of Earth’s magnetic field with the HMC5883L 3-axis magnetometer. Introduction In this project, we’ll be interfacing the HMC5883L 3-axis magnetometer to an Arduino Uno. This device can measure the magnitude and direction of …

Advanced Water Management (AWM) in 10 Steps

“If 100 people lived on Earth, 74 had drinking water available when needed and free of contamination. (source: who). With this instructable, slightly more. The equipment presented here permanently monitors and controls the water supply for a community of 7 …

Arduino Wireless Weather Station Using NRF24L01, DHT11-DHT22

“Build a wireless weather station using two NRF24L01 modules that will Display both Indoor and Outdoor Temperature & Humidity. Step 1: What You Will Need: 2X Arduino UNO (or any other Arduino) LCD I2C Display 20X4 2x nrf24l01 module 2X DHT11 …

Recycle Plastic Into 3D Printer Filament at Home

“3D printing is very exciting technology as it reaches the home scale but using brand new filament was not acceptable to me as it would just increases the plastic waste amount on the planet. I started to look for a …

Bad Apple on 32K EEPROM

“This post covers how we interface a 32K EEPROM, a clock and an address register to a 20 x 4 LCD character display module and use it to play a video. We “decompress” the video by expanding our 8-bit data …

AIM65 lookalike computer from scratch

“AIM65 is a legendary single board computer from the 70s. I build on from scratch using Arduino standard components. The idea The Rockwell AIM 65 was one of the early 6502 based computers of the 70s. It had a 20 …

Arduino Race Timer, Lap Counter, and Controller

“Race controller for slot car or drone racing with dedicated racer gates. Cheap, portable, accurate, and easy to build. This is an Arduino based project that implements an inexpensive, reliable, race game controller that can be used for timed racing …

Mushroom Cultivation Automation: From Foraging To Fruiting

“Mushrooms are a unique and often mysterious organism. They’re not quite plants and not quite animals. As a fungus, mushrooms represent a distinct evolutionary lineage. Fungi grow as a single-cell yeast form (used in beer, wine, and bread making …