This page describes the electronic hand-held instrument invented by mr. Voja Antonic. It's based on Microchip's PIC16F84 (running at 10 MHz) and a standard 2x20 character LCD-module.
The instrument is intended to be a digital laboratory tool for hardware and software debugging. The four functions are:
|Serial code receiver||The serial
code receiver receives 42 bytes and displays them in both
HEX and ASCII. The baud rate is selectale in 8 steps from
1200 to 115200. The data "word-length" is 7 or
8 bits with or without a parity bit. Signal polarity can
be chosen to fit either a TTL signal or an RS-232 signal.
|Logic state analyzer||This is a
one-channel logic state analyzer. It fetches 300 single
bit samples in a selectable rate from 25ms to 1ÁS (40 Hz
to 1 MHz in 16 steps). The sampling is trigged at at a
selectable edge (high-to-low or low-to-high). The digital
waveforms are displayed in a pseudographic mode on the
|Frequency counter||The frequency
counter displays the frequency with up to 8 digits on the
LCD. The refresh rate is 500ms. There are four ranges,
from 5 MHz to 40 MHz, which affect the count resolution
(from 4 to 32).
|Logic probe||The low and high logic levels are displayed by LEDs which are OFF if the probe tip is floating. A transition (high-to-low or low-to-high) is indicated by turning on the "pulse" -LED for 80ms.|
There is also a battery manager menu to control the charge / discharge of the built-in rechargable battery which consists of four AAA cells (= LR03 or R03).
The user interface is with LED and LCD output and command input by two keys. Signal input can be either TTL levels or RS-232 levels.
Technology Inc. has also
published this project as an application note called
"Engineer's Assistant Using a PIC16F84A", AN689. This is the original project description on which these web-pages are based. You should read this document to get all the details.
Good luck with your assistant !
Erik Grindheim, 06.04.2000