Javelin Stamp and a Magnetic Sensor

Comments

• Frankdeslimste Posts: 2

  2008-09-18 13:28 edited 2008-09-18 13:28

  Oh and is there a class that helps me control the magnet (just like PWM does with a servo)?
• Peter Verkaik Posts: 3,956

  2008-09-18 13:39 edited 2008-09-18 13:39

  Since the sensor outputs an analogue voltage between 0V and 5V
  you can use the ADC class
  
  ADC mySensor = new ADC(inPin,outPin);
  
  The ADC returns values 0-255 representing 0-5V.
  Just adapt the formula given in the sensor's manual.
  
  See the javelin manual how to setup the ADC pins.
  
  regards peter
• Spiders Posts: 4

  2011-02-21 15:35 edited 2011-02-21 15:35

  How would I connect a magnetic sensor with digital output to the javelin breadboard?
• jmspaggi Posts: 629

  2011-02-22 04:32 edited 2011-02-22 04:32

  Hi Spiders,
  
  You need to provide more details.
  
  Which sensor?
  
  Have you tried the ADC class proposed by Peter below?
  
  JM
• Spiders Posts: 4

  2011-02-25 07:29 edited 2011-02-25 07:29

  http://www.newark.com/honeywell-s-c/2ss52m/magnetic-sensor/dp/48F2833
  
  This is the sensor in question, it's a three pin hall-effect sensor. I used the ADC configuration on my javelin and the values returned were independent of any magnetic field I tried putting near the sensor. Then I realized that the sensor I have has a digital output, so I figured I should be able to just connect the sensor to the breadboard to get it to work, but I tried that and it just continuously returned the same value (320 i think).
  
  I have just recently purchased the javelin so I'm still very new to it, as well as the specifics of bread boarding and circuitry so sorry if this is a stupid problem.... (I program in Java and I've taken college physics dealing with electricity; that's the main source of my knowledge).
• jmspaggi Posts: 629

  2011-03-04 13:32 edited 2011-03-04 13:32

  Hi Spiders,
  
  I looked at the documentation, but there is not much to see in it. There is no protocol definition, etc. Do you have any other doc which define the signals, the way to talk to the component, and so on?
  
  JM
• Spiders Posts: 4

  2011-04-18 07:29 edited 2011-04-18 07:29

  Unfortunately I do not....I contacted Honeywell for more documentation, and i scoured all of their articles. They have not gotten back to me after about a month, and I couldn't find anything but marketing gibberish in their articles......
  
  Are there any tests I can run using the javelin to get any helpful information?
  
  Or are there any configurations which I can try? Shouldn't it be fairly simple since the output from the sensor is digital?
• Spiders Posts: 4

  2011-04-18 07:33 edited 2011-04-18 07:33

  Would this configuration adapted to the javelin work?
  
  http://www.sciencebuddies.org/science-fair-projects/project_ideas/Elec_p030.shtml
  
  if so how would the multimeter translate into pin configurations?
• jmspaggi Posts: 629

  2011-04-19 05:21 edited 2011-04-19 05:21

  Hi,
  
  I think it will work.
  
  If you output can vary between 0 and 5, simply connect it to a javelin PIN.
  
  When the output will be lower than 2.5V you will read a 0 on the Javelin side.
  When the output will be higher than 2.5V you will read 1 on the Jvalin side.
  
  I'm not 100% sure it's 2.5V the switch value, but you can find that in the Javelin documentation.
  
  If you want more than an 0 / 1 value, then this is more complicated.
  
  JM