Electronic Kits from Ozitronics

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August 12 , 2012

Surplus Stock
Atmel AT89C52-24PC - 40-Pin 24MHz 8kb 8-bit Microcontroller (photo) - $1.50 each, minimum order = 10 pieces
These microcontrollers are brand new, never used. They are left over from a cancelled manufacturing job.

K193. 12V Sealed Lead Acid (SLA) Battery Charger
A 'smart' Sealed Lead Acid (SLA) 12V Battery Charger with Current Limiting. The charger uses a two step process for charging SLA batteries - a current limited 'fast' mode followed by a constant voltage 'float' mode. An onboard LED indicates when the charger is in 'fast' mode. When the LED goes out the battery is charged and the charger has switched to 'float' mode.

The charging current is user settable using two parallel resistors. Maximum charging current is 1A.

K192. Serial LCD Controller
This serial display module provides easy operation of a standard character LCD display. The simple command structure allows text and bar graphs to be displayed on the LCD. Provision is made for up to 8 user-defined characters. The module also includes four digital outputs.

The LCD backlight and contrast may be adjusted under program control to compensate for differing lighting conditions and viewing angles.
NOTE: The supplied LCD does not have backlighting. User must supply a backlit LCD if this feature is required.

The module supports 2 interfaces:
• Serial RS232 interface
• Serial TTL interface

The module has the following features:
• Communicates over serial interface with software controlled speed
• 32 Byte buffer for messages received via communication interface
• Up to 8 custom characters can be defined
• Built in commands for drawing bar graphs
• LCD Backlighting controlled via software, has 254 brightness levels
• LCD Contrast controlled via software, has 254 contrast levels
• 4 digital outputs
• Save the basic settings in module internal EEPROM

A simple Windows control program is provided to enable manual setting of each of the features of the module. It allows the user to quickly test the module and get an idea of how each feature looks and works.

K191. 3 Channel RGB LED Controller

This kit is a versatile LED control module. It provides 3 high current channels to create light effects for presentations, parties, etc. The module includes preprogrammed light sequences and can be used as a standalone LED controller.A simple command set allows easy module control via a serial interface to your microcontroller or PC. Ideal for use with flexible LED light strips.

Windows software provides module control from a PC and and is used to create custom user-editable sequences. Use a USB-to-Serial converter or straight-through 9-way serial cable to connect the LED controller to a PC.

K190E. Enhanced 4 Channel Temperature Monitor & Controller chip

An upgrade controller chip for K190 with added commands to enable up to four (4) thermostat channels. There are also added commands to toggle each or all relays, dump the temperature of all sensors and the status of all relays at pre-determined time intervals and display any thermostat settings.

The thermostat channel is created by linking the same numbered sensor and relay together eg. sensor 1 and relay 1, etc. Each thermostat can be configured for heating or cooling mode with user-defined setpoint and dropout (hysteresis) temperatures. All thermostat settings are saved to non-volatile memory so data is retained between power outages. Once the thermostat settings have been programmed the kit can be disconnected from the PC and operated independently.

Simply remove the original microcontroller chip and replace with the K190E chip.

Sadly, Peter Crowcroft (DIY Electronics founder) passed away on June 13th 2005. He will be missed by all his family and friends.
Don (dontronics.com), Peter (kitsrus.com), Frank (ozitronics.com)

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