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Saturday, April 20, 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



Create a single message on an Alphanumeric display. Visit www.bits4bots.shop/blog for more details.

Design Services

Design Services


Do you have a circuit that you would like turned into a professional PCB? Perhaps a simple break-out board for a tough to solder part, or a small application specific MCU board like the popular Atmega328? 
Add your logo! Great for STEM programs and capstone projects.
We can turn your sketch into a schematic or 3D pcb file or tangible circuit for soldering.


Bits4Bots LLC offers PCB design services for simple 2 layered circuit board projects. We can supply final Gerber files, along with the source documents, bare boards, or populated boards. Small quantities, as low as 10 boards in red, blue, green, black, white, or *purple & pink (additional cost), are possible. 

Special price for dimensions: 5cm x 5cm and 10cm x 10cm  
Boards are manufactured internationally and may take 1-8 weeks for shipping/delivery. 

We also offer laser cutter designs in DXF format. Laser cutting is done in house USA and will take 1-2 weeks for shipping.

Please contact us via the bits4bots@gmail.com to describe your project, and request a quote.

We look forward to hearing from you.