Cheap and Simple Learning Board using AT89S51

Build your own a cheap simple Microcontroller learning board S-52. The board is based on ATMEL’s new ISP chip AT89S51, AT89S52, or AT89S53. This board can be used by beginners for learning Assembly and C language programming. Single sided PCB file included.


I have designed this leaning board to be used as a tool for learning MCS-51 Microcontrollers.
The AT89Sxx learning board features,

  • Designed for new ISP chips, 89S51, 89S52, and 89S53, 40-pin DIP,
  • In System Programmable (ISP) through the 6-pin header and a jumper, (no need external programmer),
  • TxD and RxD serial port for communicating with serial devices,
  • 32 bit GPIO,
  • Onboard rectifier and +5V DC voltage regulator,
  • Single Sided PCB design.

Learning Board
The board design is kept as simple as possible so that even a total newbie with microcontroller can easily make his owns learning board. The schematic shown below depicts the complete hardware of the AT89Sxx learning board. Port 0,1,2,3 are available for interfacing external devices. P3.0 and P3.1 are being used for UART.
Bill of Materials
R1                          330 1/4W +/-5%
R2                          10K 1/4W +/-5%
C1                         1000uF/16V electrolytic capacitor
C2                         100uF/16V electrolytic capacitor
C3                         100nF multilayer or ceramic
C4                         10uF/16V electrolytic
C5,C6                    33pF ceramic
D1                         1N4001 / 1N4002 silicon rectifier diode
D2                         Led
U1                         Lm7805, voltage regulator
U1                         AT89Sxx
DB25 parallel port, 25pins connector
For more detail: Cheap and Simple Learning Board using AT89S51

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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