The above demo unit perspex box has been discontinued.

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Overview

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 after power-up.
• Easy text displaying via scratchpad.
• Direct LCD register and data memory access to enable full control of the LCD.
• 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 events).
• 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 resistor).
• 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 parameter setup.

• 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.

Acquirement Options

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 products. 

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