Retired Product

This product has been retired from our catalog and is no longer for sale. This page is made available for those looking for datasheets and the simply curious.

Creative Commons images are CC BY 2.0

Description: Replacement: None. There i s no direct replacement for this board. This page is for reference only.

The BASIC Stamp is a classic! Originally introduced in 1995, this juggernaut has seen quite a long run. The BASIC Stamp BS2 is a microcontroller developed by Parallax, Inc. which is easily programmed using an easy-to-learn language called PBASIC. It is called a “Stamp” simply because it is close to the size of an average postage stamp. You can use the BASIC Stamp 2 to control and monitor timers, keypads, motors, sensors, switches, relays, lights, and more.

All vital components (processor, clock source, memory, power regulator) are provided on the BS2’s tiny PCB; just connect power and go! The BS2 uses a PIC16F57 as the main processing unit and all other vital components (oscillator, memory, voltage regulator) are included; the board even has an RS-232 to TTL converter, so you can connect it directly to your PC. See related items below for serial cable and breakout board.

The BS2-IC is widely used in educational, hobby, and industrial applications and is recommended for first-time BASIC Stamp users because of plentiful resources (documentation, source code, and customer projects) that are available online and in print. We also carry a number of other educational kits based around the BS2, check them out in the related products below.


  • Power Supply Requirements: 5.5-15VDC (Vin) or 5VDC (Vdd)
  • Communication: Serial (9600 baud for programming)
  • Processor Speed: 20 MHz
  • Program Execution Speed: ~4,000 PBASIC instructions/sec.
  • RAM Size: 32 Bytes (6 I/0, 26 Variable)
  • EEPROM (Program) Size: 2 KBytes; ~500 PBASIC instructions
  • Number of I/O Pins: 16 + 2 dedicated serial
  • Current Draw @ 5 VDC: 3mA Run, 50 μA Sleep
  • Source/Sink Current per I/O: 20 mA / 25 mA
  • Source/Sink Current per unit: 40 mA / 50 mA per 8 I/O pins
  • PBASIC Commands: 42
  • Package: 24-pin DIP
  • Industrial-Rated since Rev J


  • 1.20 x 0.63 x 0.15 in (30.0 x 16.0 x 3.81 mm)


Recommended Products

Customer Comments

  • The BS2 is a great place to start with microcontrollers. In 1995 I used three of them to build a car alarm with voice and radar. One handled communication with a DTMF decoder chip and processed the inputs from the 2 button remote and radar sensor. The DTMF was an input from a ham radio for super long distance control. The second BS2 handled the remote start operation and management. The third communicated with an ISD chipcorder and controlled the audio amplifier. It had 16 recorded messages. The audio was also linked to the ham radio so it would respond to tell you that the car was cranked.
    Yes these are basic, but you would be suprised at what you can do!

  • Stamp 2 makes an ideal introduction to microcontrollers. The language is easy to master for someone who’s new to programming.
    The main downside of this microcontroller is the lack of analog inputs. Analog measurements are performed though an RCT circuit (resistance capacitance time), which affects code execution time.
    The up side is that the chip has everything on it, including a serial transceiver and a power regulator.

  • altough i would have prefered seeing Propellers its nice to see that paralax has entered sparkfun.
    the stamp aint really my kind of microcontroller.
    i find 40 euro for a small pcb with a mcu and some small components very expensive.
    especially since the picaxes entered the fray.

    • Hi,
      Agreed, it is a bit more than other options out there. Unfortunately this is not a Sparkfun board, so we have much less control over the final cost. This board may serve some tinkerers, better than it serves you. Hopefully you’ll be able to find other options.

Customer Reviews

No reviews yet.