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All circuit boards come assembled and tested, and feature:

     ATmega128-16 processor

     JTAG and ISP headers

     LCD header

     Keypad header

     linear regulator

     LM61 temperature sensor

     dual RS-232 driver

     piezo electric buzzer

     large prototype area

     digital pot for LCD contrast control

     PWM circuit for LCD Back light

 

See individual schematics for details.

 

We've tried to include the most commonly utilized components.  Of course, we couldn't  include everything so we left a lot of prototyping area.

 

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PDK-H PCB

 

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PDK-I PCB

 

Voltage regulator

 

DC jack

 

ATmega128

 

keypad

connector

 

LCD connector

 

RS232

driver

 

piezo

transducer

 

JTAG

header

 

ISP header

 

footprint for

9 Volt battery holder

 

footprint

for

cyrstals

 

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People have often asked why we included the temperature sensor.  Here are three uses:

1.  Monitor the internal temperature and shut down if it exceeds

the operating limit.

2.  Software based temperature compensation for analog circuits, LCD contrast or the Real Time Clock.

3.  Allows software to log the max/min temperatures your product is exposed to and validate warranty claims.