BASIC Stamp Comparison Chart

BASIC Stamp microcontroller modules are like tiny single-board computers.  Many projects that require an embedded system with some level of intelligence can use a BASIC Stamp module as the controller. Each BASIC Stamp module contains a PBASIC Interpreter chip, internal memory (RAM and EEPROM), a 5-volt regulator, a number of general-purpose I/O pins (TTL-level, 0-5 volts), and a set of built-in commands for math and I/O pin operations. 

See the Pin Descriptions and Connection Schematics pages for more information.

Name	BS1	BS2	BS2e	BS2sx	BS2p24	BS2p40	BS2pe	BS2px
Features	Affordable yet capable, the original BASIC Stamp is perfect for smaller projects or tight spaces.	Ideal for beginners yet quite powerful, with a vast resource base and sample code. Core of the Stamps in Class program.	Perfect for those who have experience with the BASIC Stamp 2 and would like more variable and program space.	Supports the BS2 command set with more variable and program space, and 2.5 times the execution speed.	Special commands support I/O polling, character LCDs, and i2C and 1-Wire protocols.	All of the features of the BS2p, plus an additional bank of 16 I/O pins.	BS2p command set paired with lower power consumption and more memory for battery-powered data logging applications.	The fastest BASIC Stamp microcontroller supports the BS2p command set as well as special I/O configuration features.
Environment**	-40 to +85 ºC (-40 to +185 F)	-40 to +85 ºC (-40 to +185 F)	-40 to +85 ºC (-40 to +185 F)	-40 to +85 ºC (-40 to +185 F)	-40 to +85 ºC (-40 to +185 F)	0 to +70 ºC (32 to +158 ºF)	0 to +70 ºC (32 to +158 ºF)	0 to +70 ºC (32 to +158 ºF)
PBASIC Interpreter chip	Microchip PIC'56	Microchip PIC'57	Ubicom SX28	Ubicom SX28	Ubicom SX48	Ubicom SX48	Ubicom SX48	Ubicom SX48
Processor Speed	4 MHz	20 MHz	20 MHz	50 MHz	20 MHz Turbo	20 MHz Turbo	8 MHz Turbo	32 MHz Turbo
Program Execution Speed	~2,000 instructions/sec.	~4,000 instructions/sec.	~4,000 instructions/sec.	~10,000 instructions/sec.	~12,000 instructions/sec.	~12,000 instructions/sec.	~6000 instructions/sec.	~19,000 instructions/sec.
RAM Size	16 Bytes (2 I/O, 14 Variable)	32 Bytes (6 I/O, 26 Variable)	32 Bytes (6 I/O, 26 Variable)	32 Bytes (6 I/O, 26 Variable)	38 Bytes (12 I/O, 26 Variable)	38 Bytes (12 I/O, 26 Variable)	38 Bytes (12 I/O, 26 Variable)	38 Bytes (12 I/O, 26 Variable)
Scratchpad RAM	N/A	N/A	64 Bytes	64 Bytes	128 Bytes	128 Bytes	128 Bytes	128 Bytes
EEPROM (Program) Size	256 Bytes, ~80 instructions	2K Bytes, ~500 instructions	8 x 2K Bytes, ~4,000 inst	8 x 2K Bytes, ~4,000 instructions	8 x 2K Bytes, ~4,000 instructions	8 x 2K Bytes, ~4,000 instructions	16 x 2K Bytes (16 K for source)	8 x 2K Bytes, ~4,000 instructions
Number of I/O Pins	8	16 + 2 Dedicated Serial	16 + 2 Dedicated Serial	16 + 2 Dedicated Serial	16 + 2 Dedicated Serial	32 + 2 Dedicated Serial	16 + 2 Dedicated Serial	16 + 2 Dedicated Serial
Regulated Voltage Requirements	5 - 15 VDC	5 - 15 VDC	5 - 12 VDC	5 - 12 VDC	5 - 12 VDC	5 - 12 VDC	5 - 12 VDC	5 - 12 VDC
Current Draw@ 5 volts	1 mA Run, 25 µA Sleep	3 mA Run, 50 µA Sleep	25 mA Run, 200 µA Sleep	60 mA Run,  500 µA Sleep	40 mA Run, 350 µA Sleep	40 mA Run, 350 µA Sleep	15 mA Run, 150 µA Sleep	55 mA Run, 450 µA Sleep
Source/Sink Current per I/O	20 mA / 25 mA	20 mA / 25 mA	30 mA / 30 mA	30 mA / 30 mA	30 mA / 30 mA	30 mA / 30 mA	30 mA / 30 mA	30 mA / 30 mA
Source/Sink Current per unit	40 mA / 50 mA	40 mA / 50 mA per 8 I/O pins	60 mA / 60 mA per 8 I/O pins	60 mA / 60 mA per 8 I/O pins	60 mA / 60 mA per 8 I/O pins	60 mA /60 mA per 8 I/O pins	60 mA / 60 mA per 8 I/O pins	60 mA / 60 mA per 8 I/O pins
PBASIC Commands*	32	42	45	45	61	61	61	63
PC Interface	Serial (w/BS1 Serial Adapter)	Serial (9600 baud)	Serial (9600 baud)	Serial (9600 baud)	Serial (9600 baud)	Serial (9600 baud)	Serial (9600 baud)	Serial (19200 baud)
Windows Text Editor Version	Stampw.exe (v2.1 and up)	Stampw.exe (v1.04 and up)	Stampw.exe (v1.096 and up)	Stampw.exe (v1.091 and up)	Stampw.exe (v1.1 and up)	Stampw.exe (v1.1 and up)	Stampw.exe (v1.33 and up)	Stampw.exe (v2.2 and up)

*PBASIC command count totals include PBASIC 2.5 on all BS2 models.

**Environment ratings may change with future hardware revisions; please Contact Parallax for more information.