LCDclock

LCD Clock for HD44780 16x2 display over I²C by PCF8574 bus expander with 1-wire Thermal Sensor extension for DS1820

Developement information

Source author: Gábor Deé (dtech),
License: GNU General Public License v2.0,
Dependent packages: kmod-i2c-gpio-custom, kmod-w1-gpio-custom, kmod-w1-slave-therm.

LCDclock on a modified Wistron RDAA-81 with OpenWrt

HD44780 LCD panel and PCF8574 schematics on I²C bus

Console parameters

SysV init script configuration (/etc/config/lcdclock)

Enable (1) or disable (0) LCDclock service:

	option 'enabled' '1'

Set I²C bus and device address of PCF8574:

	option 'device' '/dev/i2c-0'
	option 'address' '0x3f'

Enable (1) or disable (0) LCD blacklight:

	option 'blacklight' '1'

Set DS1820 sensor address on 1-wire bus:

	option 'sensorid' '22-1234567c1111'

Enable (1) or disable (0) auto sensor re-read if it's failed:

	option 'autoretry' '1'

Enable (1) or disable (0) start without DS1820 sensor:

	option 'nosensor' '0'

LCD normal (1) or reverse (0) mode wiring (swap EN and RS pins):

	option 'reverse' '0'

Changelog:

v1.2.1-r74 - 2016-04-26

• Mod: required and optional parameters reorganized
• Mod: add reverse order display wiring support
• Mod: enable force start without thermal sensor

v1.2.0-r71 - 2016-02-08

• Mod: 2-lines support added and dropped 1-line display (it supports 16x2 only!)
• Mod: remove obsolated parameters and config options (like: '-w'/'wide')
• Mod: change temperature read interval to 30 seconds
• Mod: from this version the program doesn't work without DS1820 sensor

v1.1.7-r54 - 2013-03-18

• Fix: LCD panel initialization fixed (wait after clear)

v1.1.6-r53 - 2013-02-26

• New: 16x1 LCD panel support added ('-w' parameter)

v1.1.5-r51 - 2012-12-05

• New: sensor auto re-read parameter added
• Mod: leap second calculation reimplemented for sensor read loop
• Fix: LCD panel initialization function fixed

v1.1.4-r47 - 2012-11-23

• New: add sensor error reports on LCD panel
• Fix: removed temperature re-check loop (error report)
• Fix: exit function removed if the sensor will be inaccessible
• Mod: the first temperature read set to :00 second (delay +20 secs)

v1.1.3-r45 - 2012-10-25

• Fix: memory allocation issue while DS1820 sensor reading

v1.1.2-r43 - 2012-10-09

• New: add support for DS1820 thermal sensor over 1-wire (optional)

v1.0-r27 - 2012-09-03

• Fix: custom I2C kernel module dependency added
• New: blacklight control parameter added
• New: init.d and uci configuration file added

v1.0-r24 - 2012-09-01

• New: Initial release

Copyright (C) 2016 dtech(.hu), http://openwrt.dtech.hu/projects/LCDclock/.