The Milky way steals the show from Sahara sands that make the Earth glow orange. Reid Wiseman a NASA astronaut has captured this pic from International Space Station.
The Milky way steals the show from Sahara sands that make the Earth glow orange. Reid Wiseman a NASA astronaut has captured this pic from International Space Station.
Do you know new study could provide visions about the abundance of water in fragments from a famous asteroid? This research mainly focused on a mineral called apatite. Want to know more about this asteroid?
Do you know new study could provide visions about the abundance of water in fragments from a famous asteroid? This research mainly focused on a mineral called apatite. Want to know more about this asteroid?
All Cricket devices have a built-in bidirectional infrared communications channel, which is used for Cricket-to-desktop communication (when downloading programs to a Cricket, or viewing sensor data) and Cricket-to-Cricket communication.
Cricket Logo is based on an iterative, interactive model of project development. It includes a “command center” window; instructions typed into this window are instantaneously compiled, downloaded to a Cricket, and executed, giving the system the flavor of an interpreted software environment such as LISP, BASIC, or FORTH.
The MetaCricket software system is based on a virtual machine, written in PIC assembly language and running on the Cricket, and a compiler for the virtual machine running on a desktop development computer
It is straightforward to implement an interpreter-like interface, where user commands are transparently compiled, downloaded, and executed.
The Cricket virtual machine is burned into the PIC microprocessor's internal ROM
The user's code resides in a serial EEPROM
Built-in infrared communications routines include a protocol for reading and writing to this external EEPROM, and for asking the virtual machine to begin execution of byte codes already loaded into the EEPROM.
Users write programs for the Cricket in Cricket Logo, a dialect of Logo specialized for the Cricket virtual machine. Essentially, there is a one-to-one mapping between statements in Cricket Logo and primitive functions built into the virtual machine. This makes the implementation of the compiler far simpler than typical compilers.
The compiler includes an interactive mode—a text window where user expressions are compiled, downloaded, and executed in one step when the user presses the return key. A portion of the Cricket's memory is set aside for these dynamic programs.
we have found that a debugger is not necessary because of the interactive and incremental style of project development that occurs when using the Cricket.
The infrared protocol includes the following capabilities:
Check that a Cricket is present and ready for other commands.
Write a byte to the Cricket's EEPROM.
Read a byte from the Cricket's memory.
Begin program execution from a particular memory address.
User-level primitive functions compile to one, two, or three bytes of object code for the Cricket virtual machine.
The Cricket virtual machine has two process threads: a foreground process and a background daemon. In most Cricket programs, the foreground thread handles all the work, but for some tasks, the background daemon is valuable. For example, the background daemon can be used to instigate a periodic activity, or take action when some event occurs.
There are hardware-specific primitives for interacting with on-board Cricket hardware. Motor commands set state (on or off), direction, and power levels for each of the two integrated motor drivers. Analog sensor primitives (sensora and sensorb) return a value (0 to 255) for each of the two voltage inputs. These inputs also may be interpreted as digital values using the switcha and switchb primitives. There is a pair of primitive functions for generating tones on the piezo beeper: beep and note, the latter taking pitch and duration arguments.
there is a background millisecond timer that is updated every four milliseconds
One foreground thread plus one background daemon
Daemon fires when provided Boolean expression makes false-to-true transition
pseudocode:
read left_photoresistor
read right_photoresistor
if left_photoresistor detects more light than right_photoresistor
then turn robot left
if right_photoresistor detects more light than left_photoresistor
then turn robot right
if right_photoresistor detects about the same as left_photoresistor
then robot goes straight
loop
Photovore Algorithm, Improved
This algorithm does the same as the original, but instead of case-based it
works under a more advanced Fuzzy Logic
control algorithm. Your robot will no longer just have the three modes of turn left,
turn right, and go forward. Instead will have commands like 'turn left by 10 degrees'
or 'turn right really fast', and with no additional lines of code!
pseudocode:
read left_photoresistor
read right_photoresistor
left_motor = (left_photoresistor - right_photoresistor) * arbitrary_constant
right_motor = (right_photoresistor - left_photoresistor) * arbitrary_constant
loop
Photovore, Split Brain Approach
This algorithm works without comparison of photoresistor values.
Instead, just command the right motor based on light from the right sensor, and the left
motor with only data from the left sensor.
You can also get interesting variations by reversing the sensors for a cross-brain algorithm.
pseudocode:
read left_photoresistor
read right_photoresistor
move left_wheel_speed = left_photoresistor * arbitrary_constant
move right_wheel_speed = right_photoresistor * arbitrary_constant
loop
The photovore is a robot that chases light, and is perhaps the simplest
of all sensor algorithms. If you are a beginner, this should be your first
algorithm.
Usually, the operating system takes all the values from the sensors, averages them, then finds the one that is the furthest away from that average
The Ant Farm is built next to a very large window that faces east. As a result, with the lab lights off, the brightest light source is always to the east. The robots can use this as a reference and then find all the other directions.
The Ants are a community of cubic-inch microrobots at the MIT Artificial Intelligence Lab. There are two main goals for this project. The first is to push the limits of microrobotics by integrating many sensors and actuators into a small package. The second is to form a structured robotic community from the interactions of many simple individuals. The inspiration behind this idea comes from nature -- the ant colony.
Welcome to the leaner, cleaner, BEAM From the Ground Up! This site is designed to be a useful collection of material for BEAM roboticists of all experience levels and abilities. The unifying focus here is on learning -- so this is the place to look for tu
Are you starting for your career as a data scientist? To become an expert in data science you need to begin from the ground up. And you need to get a step-by-step guide to becoming a data scientist and for learning a particular skill. Instead of jumping for a master program in computer science you need to focus mathematics, python,r-programming or statistics or develop a skill in data science. If you are looking out for such a learning institute then you could also take a walk for edwisor.com as it works for enrolled students in data science career program as well as in the hiring process and gets 4 Guaranteed interviews at top organizations.
One man turned the robot back in the direction from which it had just come, saying out loud to the Tweenbot, "You can’t go that way, it’s toward the road.”
The new discovery indicates that the intensity of Earth's magnetic field is decreasing 10 times faster, leading some geophysicists to predict a reversal within a few thousand years.
The new discovery indicates that the intensity of Earth's magnetic field is decreasing 10 times faster, leading some geophysicists to predict a reversal within a few thousand years.
Get latest NASA invention's pictures, discoveries, technologies, space exploration and other news only at Astrobiology Magazine. Join us on Pinterest to see current happenings in Universe.
Get latest NASA invention's pictures, discoveries, technologies, space exploration and other news only at Astrobiology Magazine. Join us on Pinterest to see current happenings in Universe.
We all are aware of the fact that billions of years ago, there was very little oxygen on Earth to breathe. Scientist of University of California at Riverside (UCR) have researched when in Earth's history oxygen may have abundant. Curious to know how origins of Earth survived?
We all are aware of the fact that billions of years ago, there was very little oxygen on Earth to breathe. Scientist of University of California at Riverside (UCR) have researched when in Earth's history oxygen may have abundant. Curious to know how origins of Earth survived?
Do you know Robotic missions to Mars have revealed clues about the planet's atmosphere and surface composition? NASA is investing to find and use natural resources beyond Earth. Want to know more about Robotic Mars Mission.
Do you know Robotic missions to Mars have revealed clues about the planet's atmosphere and surface composition? NASA is investing to find and use natural resources beyond Earth. Want to know more about Robotic Mars Mission.
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