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Posts Tagged ‘hd44780’

Temperature alarm for boiling milk

Tuesday, November 29th, 2016

Domen Ipavec shares his temperature alarm for boiling milk in the project log forum: Anyone who has ever boiled milk on the stove knows, that it has a nasty habit of overflowing. That is why I created the temperature alarm for boiling milk to be used my mother. The temperature...

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Posted in project logs | No Comments »

CO2, temperature and humidity monitor

Tuesday, September 13th, 2016

An open source CO2 monitoring project from Roving Dynamics: The project described below uses a MH-Z16 or MH-Z19 CO2 sensor and a DHT-22 (or DHT-11 if less accuracy is required) to measure the Temperature and Humidity. It has a 4 line by 20 character LCD Display to show the current readings...

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Posted in PIC, sensors | No Comments »

An AVR Atmega library for multiple HD44780 based LCD connected through i2c

Thursday, August 4th, 2016

Davide Gironi has posted an I2C multiple HD44780 AVR Atmega library: This library implements a driver for HD44780 lcd connected through PCF8574 port expander. Data is transmitted using only 2 wire over i2c with the PCF8574. This library can drive up to 8 LCD concurrently. Lcd driver is based upon...

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Posted in AVR, library | No Comments »

Digitally controlled 2.1 channel analog audio power amplifier

Monday, October 13th, 2014

Dilshan Jayakody  writes: This article introduces high quality digitally controlled 2.1 channel analog audio power amplifier system. This project is mainly based on TDA7377 AF power amplifier and PIC18F452 8bit microcontroller. Basic features of this receiver are 2 × 6W + 20W audio output power, ±14dB bass and treble controls,...

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Posted in open source | No Comments »

What’s up with HD44780 LCD displays?

Monday, July 14th, 2014

Nerd Ralph writes: There's lots of projects and code online for using character LCD displays based on these controllers, particularly the ones with 2 rows of 16 characters (1602).  They're low power (~1mA @5V), and for only $2 each, they're the cheapest LCD modules I've found.  The controllers are over...

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Posted in LCD | 10 Comments »

K8LH 2-Pin 74HC595 LCD “8-bit” Backpack

Thursday, June 12th, 2014

McLaren writes, " here's another 74HC595 Backpack design with a 2-pin interface that uses LCD 8-Bit interface mode. Driver is pretty simple. It takes about 100-usecs to send each byte. Please check it out" Via the forum.

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Posted in LCD | No Comments »

COLDES1 (COLlaborative DESign) – LCD 2 TV Out

Thursday, July 25th, 2013

Mats writes: Most of the PAWs are rather simple but I'd like to to some more involved/advanced projects every now and then.  So I would like to propose a new series of projects - the COLDES - Collaborative Design. Where we are a few that uses our shared time and...

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Posted in project logs | No Comments »

PIC12F source shared for the one-wire HD44780 LCD controller

Friday, July 27th, 2012

As a follow up to the "One wire control of HD44780 LCDs" post, McLaren shared the Assembly source code for his project. Pick up the source in the forum. Assembly language source file and hex file (for 12F683) attached... Allow approximately 60 msecs after power-up for LCD initialization before sending...

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Posted in LCD, PIC | 5 Comments »

One wire control of HD44780 LCDs

Monday, July 23rd, 2012

Does the minimum 6 pins needed to control an LCD give your little microcontroller a sad? In the forum we're discussing low pin-count control methods for common HD44780 parallel displays. This one uses is a simple serial UART adapter similar to our USB and Serial LCD backpack: Here's a reasonably...

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Posted in DIY, LCD | No Comments »

ATTiny2313 controlling a HD44780 LCD via AVR-GCC

Saturday, July 21st, 2012

We came across Scott Harden's brief article describing how to control an HD44780 LCD using an Attiny2313. After a number of unsuccessful attempts with other code he found this LCD library written by Martin Thomas for use with AVR-GCC. With a few mods to the code Scott produced the above...

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Posted in AVR, code, LCD | 1 Comment »

Bus Pirate on EEVblog and 2×8 connector support on LCD adapter

Monday, July 16th, 2012

Dave over at EEVblog tested an HD44780 LCD, and he used the Bus Pirate and LCD adapter in his demo. In the video he works with an LCD that has a 2x8 header, but the LCD adapter only supports a 1x16 type. Here's a prototype LCD adapter board updated with...

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Posted in BP v3, Bus Pirate, LCD | 3 Comments »

Workshop Update for July 3rd, 2012

Tuesday, July 3rd, 2012

  We finalized part kit materials, and made a round of updates to Seeed sales pages, and the wiki. We also photographed some missing parts for the master part list wiki. Code for the secret project is close to first full function testing. Only one large function is left to...

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Posted in Workshop Update | 1 Comment »

Driving two character LCDs in parallel

Tuesday, March 27th, 2012

Abdullah explored the idea of driving two character LCDs in parallel. When he couldn't find any information about this online, he decided to try it out himself. Then I thought about it and I gave it a go. The result is positive! However, there is a gotcha; if you are...

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Posted in Development | 2 Comments »

0-99 minute timer

Thursday, December 1st, 2011

Raj decided to make a tutorial on how to implement a 0-99 minute timer on a PIC16F628A microcontroller. His design uses a HD44780 compatible 2x16 text LCD, to setup and display the count-down timer. One pin of the PIC should be used to drive a relay, but for testing purposes...

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Posted in how-to, project logs | No Comments »

NEW PROTOTYPE: USB & serial LCD backpack

Thursday, November 10th, 2011

Small character LCDs can show new mail stats, system performance, news feeds, and more. The USB and Serial LCD backpack connects HD44780-compatible character LCD screens to your USB (or serial) port. Almost every open source hardware shop sells some type of serial LCD backpack. Our goal is to build an...

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Posted in LCD, Prototypes | 11 Comments »

Another LCD backpack free PCB build

Monday, May 9th, 2011

Greg built the LCD backpack free PCB. By popular demand we initiated a small batch of this project, it should be available in a few weeks. If you build a free PCB we'll send you another one! Blog about it, post a picture on Flicker, whatever - we'll send you...

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Posted in builds, Free PCBs, LCD | No Comments »

NEW PROTOTYPE: USB Universal LCD backpack

Friday, December 3rd, 2010

The USB Universal LCD backpack controls LCDs with up to 16 interface pins at 3.3volts or 5.0volts. This includes common HD44780 character LCDs and larger graphical LCDs. Small backpack mounts behind most LCDs USB control for common 1x8, 1x16, 2x8, 2x16 ... up to 4x40 character displays and some graphic...

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Posted in LCD, Prototypes, USB | No Comments »

Preview: USB LCD backpack prototypes

Wednesday, October 13th, 2010

Soldered prototypes for the FT232-based USB LCD backpacks. Check out the design on the wiki, and follow development in the forum.

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Posted in Development, LCD | 3 Comments »

Free PCB Sunday: Bus Pirate LCD adapter

Sunday, September 19th, 2010

We go through a lot of prototype PCBs, and end up with lots of extras that we’ll never use. Every Sunday we give away a few PCBs from one of our past or future projects, or a related prototype. Our PCBs are made through Seeed Studio’s Fusion board service. This...

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Posted in Free PCBs | 33 Comments »

Prototype: Bus Pirate LCD adapter v2

Thursday, September 16th, 2010

The Bus Pirate LCD adapter v2 enables the mysterious LCD mode on your Bus Pirate. The Bus Pirate can't control an HD44780 LCD alone, it needs help from a few extra parts. Read the how-to and build your own adapter, or buy it assembled for $9. The v2 adapter is...

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Posted in Bus Pirate, Bus Pirate accessories, Prototypes | No Comments »

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