 | | HB's analog inputs
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does anyone know if the handy board's analog inputs can accept analog current output(4-20mA) from a photo-electric distance sensor? (e.g. the sensor might return 4mA if the object is 1 ft away and 15mA if it's 3 ft away) or can it only accept (...) (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | problems with main()
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I posted earlier in the week about having a problem with the SRAM. I have determined that there is not a problem with the SRAM on the handyboard. The problem is that "main()" is not executing on reset like it is supposed to. The program that I am (...) (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Re: HB's analog inputs
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(...) Edmund, Typically the solution is to pass the 4-20 mA through a 250 ohm resistor and measure the voltage across that resistor. As long as your A/D input impedance is high, it can be ignored. A resistor is essentially a current to voltage (...) (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Steppr motor pulse problem
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Hi, I've encounter some problem on using the stepper motor with my self-built driver. I am not using the driver in the HB. I have to build out a driver. The driver chip I use is L298 and logic gate chip is L297 or 374( this chip also use in HB) . (...) (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Digital Outputs
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I have discovered that I can use PA6 as a digital output and am wondering if the same applies to PA3 if I do not require a piezo buzzer? Thank You Joe Martin joema@mpx.com.au (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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Mekatronics also sell the GPU58 series detectors -----Original Message----- From: Rick Moll <rickmoll@mvp.net> To: Victor Ruiz <ruizvic@mx1.ibm.com> Cc: handyboard@media.mit.edu <handyboard@media.mit.edu>; Rick Moll <rickmoll@mvp.net> Date: Tuesday, (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: interfacing V2X compass
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(...) I ended up doing the same thing. I appreciate hearing that someone else had thesame problem, and used the same solution. It sure is frustrating that you can't trust the documentation that came with the compass; if you need to reset the thing (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: interfacing V2X compass
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Rick, I had the same problem. Also the compass would occassionally lock up and require a reset. I tied the reset pin to a digital out and added a routine to take all the necessary pins high and then cycle the reset pin. I reset on initialization and (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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(...) The most common metal can IR detectors are made by Sharp. The older ones I have are marked GP1U5X2 (with pins coming out the back of the can), but the newer ones I have are part number GP1U58Y (and have pins coming out of the bottom of the (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | HB 4 sale
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I have an assembled Handyboard and MIT's 6.270 board for sale. Both boards work great. 125 ea or 200 for both. Reply to this email (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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