BIG TRAK / bigtrak is a programmable electric vehicle created by Milton Bradley in 1979, resembling a futuristic Sci-Fi tank / utility vehicle, possibly for use on the Moon or a Planetoid style environment. The original Big Trak was a six-wheeled (two-wheel drive) tank with a front-mounted blue “photon beam” headlamp, and a keypad on top. The toy could remember up to 16 commands, which it then executes in sequence. There is also an optional cargo trailer accessory, with the U.K. version being white to match its colour scheme; once hooked to the Bigtrak, this trailer could be programmed to dump its payload.
In 2010, BIG TRAK was relaunched in the form of a slightly modified replica (cosmetically very similar to the original U.K. bigtrak), produced under licence by Zeon Ltd. There is also a small dedicated Internet community who have reverse engineered the BIG TRAK and the Texas Instruments TMS1000 microcontroller inside it.
- 1 Versions
- 2 The original Milton Bradley U.S. and U.K. versions
- 3 The unofficial Elektronika Soviet clones, Lunokhod and and Planetokhod
- 4 The Zeon Ltd replica
- 5 The Dubreq desktop version, Bigtrak Jr
- 6 The bigtrak sound emulator for the Apple iOS
- 7 Power
- 8 Programming
- 9 Programming the Big Trak
- 10 Programmable keypad
- 11 Computer control
- 12 Unusual sequence in Serial Numbers
- 13 Big Trak in psychological research
- 14 Popular Culture
- 15 See also
- 16 References
- 17 External
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The original Milton Bradley U.S. and U.K. versions
The U.S. and U.K./European versions were noticeably different. The U.S. version was moulded in gray plastic and labelled “BIG TRAK”, while the U.K. version was white and labelled “bigtrak” with a different keypad.
The U.S. version had Revision C, D, and E motherboards. While the U.K./European had Revision L and so on motherboards.
The unofficial Elektronika Soviet clones, Lunokhod and and Planetokhod
In the Soviet Union, a clone was made under “Elektronika IM-11″ designation. The early production version was named Lunokhod after the Lunokhod programme. It featured an obstruction sensor disguised as a plastic front bumper, which would stop the program when the toy got stuck. However, there was no provision for an accessory, and its motion sensor was based on a cheaper reed switch instead of an opto-isolator. A later version, named “Planetokhod,” additionally featured a shootable rotor blade as an accessory, LED head and rear lamps, and the on/off switch was relocated to the rear side. A Soviet popular science journal Nauka i Zhizn published a detailed article on the IM-11.
The Zeon Ltd replica
In 2010, Zeon Ltd released a replica of the original toy. The colour and graphic scheme are based on the U.K. version and all stickers have been redrawn as a direct copy of the original artwork.
The Bigtrak XTR
In 2012, Zeon Ltd released the Bigtrak XTR. It is a more modern version of Bigtrak that is not a replica. Its form was based on the Bigtrak Jr, with its ‘cockpit’ was modified to become much more smaller and streamline. It can be controlled remotely using a computer, iOS, or Android device. The controls for the iOS / Android version of the remote control application allow for either tilting control or touch control
A foldable tray allows the keypad to be hidden and safely stored from any accidental touch. The tray also functions as a cargo area, that can detect on whether or not an object has been placed on top of it. The Bigtrak XTR has two accessory ports that can be attached with optional accessories, one on the top and one on the front; its accessories are: Camera (XTRcam), computer communication module (XTRCom) that also allows another accessory to be plugged to it, light (LightBar), Infrared emitter (IRGun), and projectiles (XTRMissile). Using the camera, it is also possible for it to track an object.
The Dubreq desktop version, Bigtrak Jr
Dubreq Ltd under license from Zeon Ltd has released a 190mm long desktop version of the Bigtrak toy called “Bigtrak Jr”. Like the original Bigtral from the 1970s, it has an active accessory port for accessories including a rocket launcher (as an active accessory) and a drinks can carrier (as a passive accessory).
The bigtrak sound emulator for the Apple iOS
The original Big Trak uses a 9 volt battery to power its microcontroller, while the 4 D cell battteries are used to power its electronic motors. Possibly to prevent any electrical noise from the motor, speaker, and lamp from resetting or interfering with the microcontroller. The re-release Zeon version uses only 3 D cell battteries to power both its microcontroller and electronic motors, while the Bigtrak Jr version only needs 3 AA batteries to power both its microcontroller and electronic motors.
The original optional cargo trailer uses a single D cell battery to power its electrical motor, both for driving and dumping operations. While the optional rocket launcher accessory for the Bigtrak Jr uses 3 AA batteries.
see -Programming the Big Trak-
Programming the Big Trak
Various commands can be given, such as: “go forward 5 lengths”, “pause”, “turn 15 minutes right (90 Degrees)”, “fire phaser”, and so on. There is also a “repeat” instruction allowing simple loop to be performed, but the language is not Turing complete, lacking branching instructions; its programming also resembles the Logo programming language.
The Big Trak also lacks any sort of sensor input other than the wheel sensors, though recent re-released versions do have the ability to accept optional external input.
There were no LED displays or ways to display program instructions, beyond actually running the program, which was done by pressing “GO”. Each command inputted will be added next to the previous command inputted, allowing the operator to build a list of commands up to 16 commands.
All programming to BigTrak was done through the keypad shown here:
- Forward/Backwards: Move forward or backwards in units of body length
- Left/Right: Turn left or right in units of roughly 1/60th of a full rotation
- HOLD: Pause in 1/10 of second time units (U.K. version; P: Pause)
- FIRE: Fire the light bulb “laser” (U.K.; Photon Symbol)
- CLR: Clear the program (U.K.; CM: Clear Memory)
- CLS: Clear Last Step (U.K.; CE: Clear Entry)
- RPT: Repeat a number of steps (primitive loop) (U.K.; x2: Repeat key)
- TEST: Run short test program
- CK: Check last instruction (U.K.; Tick symbol)
- Out: Dump optional trailer accessory
- In: Reserved for future expansion (U.K.; missing. Disabled or not implemented on most if not all BigTraks)
In and Out commands
The Bigtrak is capable of communicating with an optional accessory. It uses a 3.5mm electrical plug TRS phone jack for its communication. Older bigger Bigtrak can also use a Bigtrak Jr optional accessory with an adaptor. However the newer Bigtrak XTR uses a different type of communication port, therefore it is not compatible with any previous Bigtrak accessory.
The Out command is used in the 1970s/1980s Bigtrack to dump the cargo on its optional cargo trailer accessory. While in the modern 2010s Bigtrack, it is used to do things such as shooting missiles.
However, the hardware on the late 1970s and early 1980s Bigtraks does not seem to be capable of processing any In command.
Meanwhile in the 2000s and 2010s, many people have hacked the Bigtrak by allowing to be controlled with a modern microcontrollers such as the Arduino, or even a single board Personal Computer such as the Raspberry Pi. The Bigtrak XTR is capable of being fitted with a communication module to wirelessly communicate with a computer.
Unusual sequence in Serial Numbers
Each Bigtrak seems to have a Serial Number that varies from factory to factory and country to country. And also, the first digit of the Serial Number in most Bigtracks, it appears to stamped by hand to an existing Serial Number instead of being pre-printed.
Big Trak in psychological research
In the early 1980s, the psychology of science community led by the laboratory of David Klahr at Carnegie Mellon University adopted the Big Trak as a research vehicle for the study of Instructionless learning, Scientific discovery, View application, Cognitive development, and Dual Space Search
In the video game Carrier Command: Gaea Mission, its version of the Walrus has resemblances to the Big Trak. There it serves as a type of futuristic Sci-Fi tank / utility vehicle to the armies in both sides. The player controls the vehicle remotely through teleoperation from the Carrier’s bridge, without anyone onboard it.
The vehicle’s large top entry/exit port (to insert and remove the 9 volt battery for the Big Trak’s microcontroller) was modified to have a machine gun attached to the top of it. Along with that modification, the two front small ‘cockpit hatches’ were also removed. Storywise, the crew can enter and exit the vehicle through a port at the rear of the vehicle.
The top rear of the vehicle (where the keypad for the Big Trak resides) was also modified to become level with the entire top of the vehicle. In the game, it was used as a flat bed rear cargo area. It is capable of carrying one of the various optional modules available in the game, ranging from a hacking module to a repair module.
- “Big Trak 2010 – History”. Retrieved 14 December 2010.
- Big Trak Versions, Serial Numbers, and Research
- “Lunokhod for informatics study.” – Nauka i Zhizn,1988,№4 (Russian magazine)
-  New bigtrak by Zeon Ltd
-  Stuff.tv article
- A demonstration video of Bigtrak XTR
- “Bigtrak Jr”.
-  bigtrak iCalc iPhone app
- “This electrical isolation helps prevent electrical noise from the motor, speaker, and lamp from resetting or interfering with the microcontroller.” – Robot Room
- Big Trak IN and OUT Commands – Robot Room
- Ciarcia, Steve (February 1981). “A Computer-Controlled Tank”. BYTE. p. 44. Retrieved 18 October 2013.
- The first digit of all the 7 digits the Serial Number.
- D Klahr, 2000, Exploring Science: The Cognition and Development of Discovery Processes, Cambridge , MA:MIT Press
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