barcode scanner emulator

Posted on Feb 6, 2014

Build primarily as proof of concept and because I found the challenge interresting, this little unit is able to send an ascii string terminated with a CR/LF via a RS232 connection. It`s emulating the transmission of a barcode and can be used with any kind of equipment that is expecting a barcode. I have been a little lazy on this project, as I hav

Click here to download the full size of the above Circuit.

e based it on the arduino serial V2 layout. This is also the reason I don`t have a neat schematic to show. But I have the reference schematic from the arduino board. And my handdrawn notes on the wiring and keypad. Please note that I have replaced the transistor version of the TTL to RS232 circuit with a MAX232 chip. This makes a more stable signal for the RS232 communication. Oh, and there is also a connection to pin1 on the SUB-D (not shown on the schematic) for supplying the BAR-X with a 5 volt from the RS232 port. (only available on specific equipment) And finally to make the whole thing work. Here is the sourcecode for the embedded program. Mind you it`s nothing fancy. I tried using some procedures to shorten the code. But it never worked So I took the sequential approach instead. /* * Barcode Emulator V0. 1 * * = * * A pre-defined ASCII code will be send * * using RS232 to a PC or other equipment * * connected via the serial connection. * * A Carriage Return(CR) and * * Line feed (LF) char will be appended. * * = * * Programmed by Rene Rasmussen 2011-09 * * This software released under the GPL * */ #include // define _delay_ms(). // for the delay to work correctly the compiler optimization must be set to -O2 #define UART_BAUD_RATE 9600L #define UART_BAUD_CALC(UART_BAUD_RATE, F_CPU) (F_CPU)/(UART_BAUD_RATE)*16L)-1) // wait ms Milliseconds void delay_ms(uint16_t ms) { uint16_t t; for(t=0; t<=ms; t+) _delay_ms(1); } void...

Visit page

Leave Comment

characters left:

Related Circuits

Lm3915 Audio Power Level Meter Circuit Design Electronic Project

Lm556 Datasheet Pinout Application Circuits Dual Timer

Logic ProbeCircuit Tradeofic

Mass Air Flow Maf SensorCircuit Circuit Schematic

Mixer Schematic

Model And Remote Control Schematics Electronics Circuits And

Model And Remote Control Schematics

Model Circuits Electronics Tutorial And Schematics Discover

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....

Create NOW your QR MENU for your Restaurant / Hotel / Bar / Caffe,

Comprehensive ordering/paying features. fully personalized to suit your Business.

Update Anytime! Easy and Simple!

Popular Circuits

Ethernet Controller with PIC18F452

This circuit is an ETHERNET controller I use the PIC18F452 and the mikroC C Compiler. I use also...

Low voltage detector

The values of Rl, R2, and D1 are selected for the voltage applied. Using a 12-volt battery, Rl =...

Vhf-Uhf Preamp Circuit

The MAR-x preamp shown will cover up to 1.5 or 2 GHz with the correct MAR-x IC. ATTN1 should be...

LED Drivers/LCD Bias

I have a circuit (see attached) provided by an LCD manufacturer that illustrates using the POL...

Low-voltage oscillator features increased spectral purity

A common problem in crystal sinusoidal oscillators is the excitation of unwanted modes of the...

programming propeller ic

Parallax, well known for its successful Basic Stamp IC, has recently introduced the Propeller: a...

Negative oxygen ion generator 1

This negative oxygen ion generator circuit is composed of power supply steady voltage circuit,...

UC3625 brushless DC motor open loop speed control

28 is 45V/8A brushless DC motor driving circuit diagram. It is an open voltage-controlled,...