 | | 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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| | Analogue sonar design.
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Hi all, I'm trying to build a sonar circuit and connect it to my HandyBoard. I know Polaroid makes one, but I have no idea where to get it for little in Europe. I try to keep the interface as simple as possible, and I'll probably be using three (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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Hi Rick; I apreciated your response too much. Do you have the part number for the infrared detector? Victor G. Ruiz Aranda ruizvic@mx1.ibm.com T/L 877-7306. Ph Number 011-523-669-7306 GPL Guadalajara, Jal. Mexico. rickmoll@mvp.net on 08/25/98 (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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(...) You might want to consider just using the more commonly available metal can IR detectors. I think they are even available at Radio Shack, and I think DigiKey sells them as well. The pinouts are *not* the same, so you'll need to work out some (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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Hi to all, I would like to know if somebody knows where can I found the address of an electronic distributor that sell individual 'infrared detector' IS1U60 from SHARP, I was looking in many electronic sites and the minimun is 50 pcs. I only need 2 (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | No subject given
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Hay guys, Could some one tell me where can I buy a unassembled HB. Is it hard to assembled a HB? Thanks, -anton (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Infrared Detector
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Hi to all, I would like to know if somebody knows where can I found the address of an electronic distributor that sell individual 'infrared detector' IS1U60 from SHARP, I was looking in many electronic sites and the minimun is 50 pcs. I only need 2 (...) (26 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | polaroid
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LS. I read something about the sonarboard. Bill James did write to Jim about Jim finding a solution for some board. I am interested in any solution to make my polaroid board work. It doesn't even make a sound. It doesn't work at all.....?? I wonder (...) (26 years ago, 24-Aug-98, to lugnet.robotics.handyboard)
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| | Re: 32K static CMOS RAM bad?
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(...) It sounds like the SRAM is just fine. Is your battery charged up??? If so, you may want to check out the battery backup circuit for the SRAM. In the HB assembly instructions there is a test to verify that the SRAM has voltage to it even when (...) (26 years ago, 24-Aug-98, to lugnet.robotics.handyboard)
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| | Sonar board?
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Jim, Congrats on getting the board to ping and read. If you believe you circuit is good, I would be willing to buy a board and etch some at the RBNO tommorow. That is if you have it laid out. I would give you a board for your hard work. Tell me and (...) (26 years ago, 24-Aug-98, to lugnet.robotics.handyboard)
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| | 32K static CMOS RAM bad?
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I am having some problems with my handyboard and before going out and buying a new chip, I thought I might get some confirmation. The board works okay, but no longer stores the program. I can download the pcode and it stays when the board is powered (...) (26 years ago, 24-Aug-98, to lugnet.robotics.handyboard)
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