Sunday, April 21, 2019

Atanua| 74ls85 4-BIT MAGNITUDE COMPARATOR

Today's blog is about the 74ls85 TTL. To build a circuit with this chip you will need two 4 pack dip switches and three led's. A datasheet is below. This TTL will compare the combined value for the 4-bit input of A inputs vs the B 4-bit inputs. The output will send a high to only one of the led's, AB depending on the condition. 




Comparison of words greater than 4-bit can be accomplished by cascading 'ls85 as described in the data sheet. The 74ls85 compares two separate 4-bit words, or numbers, coming from two different sources, such as counter, shift register, etc., including hard-wiring one number on the chip. One 4-bit word is placed on the inputs A0 thru A3, with the Least Significant Bit on A0. The other word is placed on inputs B0 thru B3 A 7 segment display can be implemented in the circuit by joining the inputs to a decoder that leads to the display. This will show numeric values.


Acrylic Laser Cut Cubes

Want to make a cube or boxed casing for a project? 




Making project encloses are not so difficult. I wanted to make a sample box before jumping into a customized case so this is the outcome. Let's see how it is made:

First having access to a laser cutter is essential. I was able to use a Full Spectrum laser cutter. The pattern I used was generated using MakerCase

MakerCase is a software specifically designed for easy laser cut casing.





Design specs in MakerCase
  • Units: Inches
  • Dimensions:1x1x1
  • Material Thickness: 1/8
  • Edge Joints: Finger
Next I generated the laser cut case plans. 


*Converting from one format to the other may be necessary.

A test cut was done on cardboard before I proceeded with the acrylic. 

Now that the test cut for this simple acrylic cube was a success you can expect to see more intricate designs and projects using acrylic and wood in the future.
Contact us for custom laser cut boxes via bits4bots@gmail.com

NI Multisim: Alphanumeric 15 segment display | Wired

Wire an alphanumeric 15 segment display. Display a message, characters, & more!

Download free Multisim files at www.bits4bots.shop/blog 

Create your message using 7 segment displays in your next project.




Alphanumeric characters comprise the combination of the twenty-six characters of the alphabet (from A to Z) and the numbers 0 to 9. Therefore, 1, 2, q, f, m, p and 10 are all examples of alphanumeric characters. Symbols like *, & and @ are also considered alphanumeric characters.

Arduino| Message on a single 16 segment display

Hi makers, here's a mini project that shows how to use 1 alpha numeric segment to display a message.



Create a single message on an Alphanumeric display.

Paper Circuits - Blaster Rocket

Author: Larsha Johnson Published: May 26th 2020 Experimental solderless LED kit for kids Designed for kids who want to start ...