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SI51 16 Channel Programmable Switch Input Controller - $109

SI51 Enclosure - $30

picture of SI51


The Industrologic SI51 is an Atmel AT89C4051 microcontroller based board designed to read sixteen switches or other contact closures. In addition to these contact closure inputs, it includes four digital logic level I/O signals, an RS-232 serial port, an on-board software readable push-button switch, and a software controllable LED.

The SI51 includes, pre-programmed into the microcontroller, a special version of Industrologic's simple programming language, Tiny Machine Basic, written for the hardware on the SI51. By using this language the user can quickly and easily program the SI51 to perform a number of tasks, including controlling the digital I/O lines or sending character strings to a host computer in response to contact closures. The microcontroller chip can also be re-programmed using any number of software development tools available for similar Atmel microcontrollers.

  • Based on the Atmel AT89C4051 microcontroller operating at 11.0592 MHZ
  • 16 switch/contact closure inputs with LED indicators to show on/off status
  • 4 digital logic levels signals usable as inputs or outputs including one interrupt signal
  • Convenient screw terminal block connections for all switch/contact closure and digital I/O connections
  • Serial RS-232 port with true RS-232 interface and DB9F connector matching PC compatibles
  • General purpose software readable pushbutton switch and software controllable LED
  • 512 byte EEPROM for storage of small programs or configuration information
  • On-board +5 volt power supply including screw terminal connection for external circuitry
  • Pin-type power connector for easy connection to wall block power supplies
  • Tiny Machine Basic programming language for the SI51 programmed into the microcontroller
  • EEPROM based AT89C4051 can be reprogrammed using common Intel 8051/Atmel AT89Cxx51 software development tools and device programmer

The SI51 package is shipped complete with all items necessary to immediately begin application development:

  • The SI51 circuit board
  • A serial port cable for connection to a PC compatible computer
  • A wall-block power supply
  • Host computer software and programming examples
  • Hardware and software reference manuals



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