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marketngedwisor

How to become Data Scientist in 2019? | edWisor - 0 views

blog.edwisor.com/...ecome-a-data-scientist-in-2019

scientist job demands data course role

shared by marketngedwisor on 03 Aug 19 - No Cached
  • marketngedwisor on 03 Aug 19
     
    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.
York Jong

ROBOT SENSOR INTERPRETATION - 0 views

www.societyofrobots.com/sensors_interpret.shtml

robot sensor

shared by York Jong on 14 Jun 07 - Cached
  • how to interpret sensor data into a mathematical form readable by computers
  • There are only 3 steps you need to follow: Gather Sensor Data (data logging) Graph Sensor Data Generate Line Equation
  • Some sensors (such as sonar and Sharp IR) do not work properly at very close range
  • ...1 more annotation...
  • The way to get rid of noise is get a bunch of readings, then only keep the average. Make sure you test for noise in the actual environment your robot will be in
  • York Jong on 14 Jun 07
     
    Most roboticists understand faily well how sensors work. They understand that most sensors give continuous readings over a particular range. Most usually understand the physics behind them as well, such as speed of sound for sonar or sun interference for IR. Yet most do not understand how to interpret sensor data into a mathematical form readable by computers.
Astro Biology

Know More about First Light At MARS - 0 views

www.astrobio.net/...first-light-mars

mars mission maven space station nasa news

shared by Astro Biology on 14 Oct 14 - No Cached
  • Astro Biology on 14 Oct 14
     
    Do you know how long does Mars mission take to start & sending back data once it's arrived at the red planet? Read more about Mars atmosphere, wavelength, MAVEN etc. only at Astrobiology Magazines.
  • Astro Biology on 14 Oct 14
     
    Do you know how long does Mars mission take to start & sending back data once it's arrived at the red planet? Read more about Mars atmosphere, wavelength, MAVEN etc. only at Astrobiology Magazines.
York Jong

MetaCricket: A designer's kit for making computational devices - 0 views

www.research.ibm.com/...martin.html

5star cricket martin robot

shared by York Jong on 16 Jun 07 - Cached
  • 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
  • ...13 more annotations...
  • 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 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.
  • 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 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.
  • 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
York Jong

Nervous Neurons - Process and Transitions - 0 views

www.geocities.com/...NewNvCircuits.htm

4star beam circuit nv robot theory

shared by York Jong on 28 May 07 - Cached
  • The Nv neuron circuit may look familiar as it is found in most CMOS data handbooks as an example of a simple edge detector or one-shot or mono-stable circuit application.
York Jong

PHOTORESISTOR ALGORITHMS - 0 views

www.societyofrobots.com/rogramming_photoresistor.shtml

algorithm photoresistor photovore robot sensor

shared by York Jong on 14 Jun 07 - Cached
  • 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
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  • 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
  • York Jong on 14 Jun 07
     
    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.
York Jong

BEAM Pieces -- Integrated circuits - 0 views

library.solarbotics.net/...parts_elect_ic.html

5star beam collection electronics ic motor robot solar survey

shared by York Jong on 27 May 07 - Cached
  • 1381s are CMOS voltage-controlled triggers -- these "gate" a source until the voltage is above some "trip" limit, at which point it is allowed onto a third pin
  • We use them as 3- or 5-volt triggers
  • This chip is often considered the heart of Nv net technology
  • ...22 more annotations...
  • The '240 is often called "the bicore chip," because we can take advantage of the 240's inverters to turn a single 74*240 into a bicore
  • The '240 also has tri-state outputs, so an enable line can be used to turn its outputs on and off simply (good for adding reversing capability to a 'bot).
  • any *cores built with a 74*04 will require additional logic "downstream" to amplify the current to levels sufficient to drive a moto
  • Schmitt triggers can't easily be used in suspended bicore implementations
  • use its buffers as little current amplifiers
  • it is usable for either grounded or suspended bicore designs (but better for suspended)
  • 74HC/HCTxx non-buffers (74HC14 or 74HC04) draw about half of the current consumption, and have about half the drive current compared to HC / HCT buffer chips (74HC240 or 74HC245). Non-buffer chips are thus better for oscillators, say Nv and Nu applications; they are not suited for use in driving motors.
  • 74AC is best suited for motor driver applications with all inputs driven rail to rail.
  • The '245 is an octal buffer chip, and so has 8 channels of buffering power available for our misuse. This chip was designed for data transmission uses, but we'll misuse it as a motor driver chip
  • The '244 provides us with 8 (thus the "octal") buffers, enableable in banks of 4. This is a very useful chip for amplifying small currents
  • it can drive up to 4 motors in 2 directions each, or you can "buddy up" inputs and outputs to drive fewer motors at higher current
  • it can drive up to 4 motors in 2 directions each, or you can "buddy up" inputs and outputs to drive fewer motors at higher current
  • If you can't find 1381s locally, you might have better luck finding its European cousin, the TC-54 -- for details on it
  • Note that if you need more than about 200 mA per motor, you'll need to use an H-bridge, or some similar motor driver
  • The ideal BEAM circuit would use a low (2V-3V) voltage core and sensors combined with level shifting high (5-6V) volt motor drivers to maximize efficiency.
  • 74ACxxx used in typical BEAM applications uses 4x more supply current than does 74HC/HCTxxx.
  • York Jong on 27 May 07
     
    The following material is intended to cover usage and part selection details of ICs you're most likely to see in BEAM robots.
York Jong

1381* - BEAM Wiki - 0 views

www.beam-wiki.org/...index.php

beam electronics solar

shared by York Jong on 26 May 07 - Cached
  • 1381s are CMOS voltage-controlled triggers -- these "gate" a source until the voltage is above some "trip" limit, at which point it is allowed onto a third pin.
  • If you can't find 1381s locally, you might have better luck finding its European cousin, the TC-54 -- for details on it, see its data sheet.
York Jong

Trossen Robotics Offers Pleo Preorder - 0 views

pleobot.com/...-robotics-offers-pleo-preorder

calebchung pleo robot toy

shared by York Jong on 12 Aug 07 - Cached
  • Pleo Technical Specs: Ugobe LifeOS 32 bit Atmel ARM 7 microprocessor - The main processor for Pleo 16 bit sub processor - The processor dedicated to the camera system (4) 8 bit processors that provide the low-level motor control for the servos (35) Sensors including a camera custom designed to fit into Pleo’s very compact body. (4) foot-switches to detect footfalls and being picked up - assists with spatial orientation. (12) capacitive touch sensors (4) legs, (4) feet, back, shoulder, head, chin (2) microphones for directional sound detection (14) “Force” sensors, one per servo, to recognize abuse through force feedback joints. Orientation/tilt sensor IR transceiver for bidirectional data communication with other Pleos. IR interrupter for detection of objects in Pleo’s mouth (14) motors. Standard low voltage DC motors (150) gears and clutches Rechargeable NiMH battery pack USB port with mini USB connector SD/MMC memory card slot
York Jong

CAROLL: a Cheap Autonomous Robot for On-Line Learning - 0 views

www2.lifl.fr/...caroll.html

learning pic q-learning robot

shared by York Jong on 29 May 07 - Cached
  • The algorithm used here is a simple Q-learning algorithm
  • York Jong on 29 May 07
     
    This document describes the conception, building and programmation of a non-expensive autonomous wheeled robot, using as few electronic parts and special skills as possible. It makes use of a cheap but strong micro-controller, with enough program and data
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