How it works: The PFC8574T I2C 8 Bit Adapter with the Vishay 20x4 LCD

Using the I2C 4 line LCD

https://www.rhydolabz.com/wiki/?p=16424
There is a section on the I2C LCD Backpack.
The PFC8574T I2C to 8 bit IO adapter backpack onto Vishay LCD-020N004L
PFD8574  ------------------->    20x4 LCD Header Strip  
(4)  D0                          4  Rs   H/L Register Select
(5)  D1                          5  R/W  H/L Read/write 
(6)  D2                          6  E    H/L Enable     
(7)  D3                                    --NC--       
(9)  D4                          11 DB4  data bus 0x10  
(10) D5                          12 DB5  data bus 0x20  
(11) D6                          13 DB6  data bus 0x40  
(12) D7                          14 DB7  data bus 0x80  
only the upper 4 bits are used to write a character into the LCD, the lower 3 bits are control bits.

PFC8574 DataSheet

https://www.nxp.com/docs/en/data-sheet/PCF8574_PCF8574A.pdf

https://www.ti.com/lit/ds/symlink/pcf8574.pdf?ts=1588173075877

http://raspberry-at-home.com/lcd-for-raspberry-pi-hd44780-via-pcf8574-i2c-openelec/

pi@raspberrypi:~ $ sudo i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
pi@raspberrypi:~ $

20x4 LCD Commands
https://mil.ufl.edu/3744/docs/lcdmanual/commands.html

Buy One
https://www.aliexpress.com/item/Character-LCD-Display-Module-20x4-LCD2004-IIC-I2C-TWI-2004-Display-PCF8574-for-Arduino-Uno-r3/32961369887.html?spm=a2g0s.9042311.0.0.52774c4dWuk3kg

Coming Soon - Our Own LCD Application written in Ansi C

https://github.com/biffmartin/lcd-i2c-pfc8574

Brought to You By

This Tech Tidbit was brought to you by your IoT Experts at Eleven Dimensions Computer Technologies. See the new 11D website at:

See Our Partner Websites:

Bare Wire Networks:     http://www.barewirenetworks.com
CTI Solutions:   http://www.cti-solutions.com

Many Thanks to Our Partner companies



Comments

Post a Comment

Popular posts from this blog

Microsoft Visio 2010 Premium Product Keys

Image
Visio KMS client key from Microsoft You can use these with AutoKMS tool such as Office Toolkit 2.4.9 (office 2010/2013) which will re-arm them once every 180 days. So you are always in the grace period.  At the bottom of this page are keys for Visio 2019.  If you are here to figure out how to get a free copy of Visio activated on your computer, without paying Microsoft for it, then God or Allah will judge you later for your sins. Your soul will be sent to the underworld to be tormented by Satan for these sins. Please pay for your software! Visio Standard 2010 767HD-QGMWX-8QTDB-9G3R2-KHFGJ Visio Professional 2010 7MCW8-VRQVK-G677T-PDJCM-Q8TCP Visio Premium 2010 D9DWC-HPYVV-JGF4P-BTWQB-WX8BJ Keys from our Russian friends. you can only install with these keys, you cannot activate. ========================================================================= Visio Premium 2010: ========================================================================= C383V-HPHM...
Read more

Mercedes Benz Diesel CDI EGR Emulator Circuit Diagrams

Image
Mercedes EGR Emulator Circuits for Electric Wahler EGR on Diesel Engine For any car fitted with a MAF you can't just block the  EGR valve  as the MAF detects the reduced airflow when the valve operates. If it fails to report this reduction the ECU throws a code, turns on the MIL light and engages Limp Home mode. The  EGR valve  is operated in varying degrees whenever the engine is in cruise mode. A circuit has to be designed that reduces the MAF output voltage whenever the  EGR valve  is called to actuate. Having seen a mod on another forum I decided to give it a go and installed it last night. The circuit is really simple. The  EGR valve  transducer is fed with constant 12v which is proportionately shunted to Gnd to create the potential to activate the transducer, to engage the EGR solenoid and allow hot gasses into the intage via the  EGR valve  in varying degrees. The MAF is in the cold air intake. the EGR gasses enter furt...
Read more

Configure Shoretel Voicemail Notifications to your email inbox using a free SMTP relay

Image
Configure Your Shoretel Voicemail Server to Send Voicemails As Wave Files to your inbox How Can SocketLabs Help You Setup a Free SMTP Relay Socketlabs is a free and paid service that can allow you to send 2000 free SMTP message relays every month from your verified domain. But first you need a real domain with it's own email accounts and a professional looking website on top of that, plus you need to look like a legitimate business with contact numbers and email addresses. It is not for spammers, hackers, phreakers, or junk mail junkies. Once you are ready, you create a free account at SocketLabs.com then allow the admins to verify your email and your web presence.  Once that's done, you get your credentials for their free SMTP relay that you can use in your IIS SMTP gateway to send free emails from your voicemail appliances, and your other IOT things that need to send email out, but cannot authenticate.  Many devices cannot authenticate to SMTP servers such as Shoretel...
Read more