The above demo unit perspex box has been
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The 1-Wire LCD controller connects to a Dallas 1-Wire network and functions
as a slave device. This controller could be used to display information
on a LCD under control of a 1-Wire network master. The 1-Wire LCD controller
supports different standard text liquid crystal character displays (e.g.
2 Lines x 16 Characters LCD).
The 1-Wire LCD controller has the following built-in functionality:
Unique serial number.
Support for a wide range of LCDs, from 1 Line x 8 Characters up to 2 Line
x 40 Characters.
Built-in LCD initialize: to ensure that the LCD is ready to display text
Easy text displaying via scratchpad.
Direct LCD register and data memory access to enable full control of the
LCD power ON/OFF control.
LCD back-light ON/OFF control.
3 Open collector general-purpose input/output pins (GPIO) and 1 general-purpose
input only pin (GPI).
All inputs are sampled at 25mS intervals, any detected change will increment the
input's event counter (counts up and down going
Open collector outputs can sink 10mA of current (direct LED drive with
internal 470-Ohm resistor).
112 bytes of EEPROM (Non-volatile storage).
Below are a few typical applications for the functionality implemented
on the 1-Wire LCD controller:
General Purpose Inputs and Outputs:
Control of door solenoid / magnetic lock.
Control relays for gate motors.
Read a door or gate open / close sensor.
Directly drive LEDs (with series resistor).
Directly drive Opto-couplers (with series resistor) for TRIAC control and
other optically isolated requirements.
Directly read input states from switches and Opto-couplers (with pull-up
Count events from other devices such as door-mats, Infrared Beams, passive
Infrared devices, push buttons, limit switches, etc.
Connect to any other device that can be controlled with a 5V signal or
read input from a device with a 5V output.
Status information at an access door or gate such as why access is denied
or current access time and date.
Display device, HOT plug-able handheld or wall mounted, for temperature
or other sensor readings, system status / diagnostic information, system
User information regarding device location, function, system installation
and service date time.
Pre-defined user LCD screens templates.
These are only some of the possibilities of the 1-Wire LCD controller.
The 1-Wire LCD controller has the following options regarding
its use with or in other 1-Wire devices:
The client may:
1) Obtain the 1-Wire LCD Demo
boards (as seen below) and use them in custom end products.
2) Obtain the 1-Wire LCD controller
IC (a pre-programmed PIC16F628A) ready to be used in custom end
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