 | | Re: HB
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HI Check for a short between pin 11 of the 'hc374 and +5V. Pin 11 is supposed to be connected to pin 9 of the 'hc138. It is the select line for the 8 flip-flops in the 374. If you have a logic probe, check either of these pins. They should be (...) (28 years ago, 15-Jul-96, to lugnet.robotics.handyboard)
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| | HB
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(...) connections so i am at a loss for knowing which leads to test. (...) (28 years ago, 15-Jul-96, to lugnet.robotics.handyboard)
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| | tables
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Hi, Can anyone tell me how to store a big table of data that the handy board has collected into a file for permanent storage? Thanks, -Dirk (28 years ago, 13-Jul-96, to lugnet.robotics.handyboard)
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| | IC memory map
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(...) Right now, IC reserves 16k for shared code and data space. 8k is for the multitasking stacks and interaction download space, and 8k is for pcode. -- Randy (28 years ago, 12-Jul-96, to lugnet.robotics.handyboard)
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| | Re: Malloc
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8K might be all that IC allows for user global data. The memory map can be rearranged, but only at the compile-time of the IC application. Newton Labs should be able to give you a definitive answer about the memory organization of IC 3.1. -Fred In (...) (28 years ago, 12-Jul-96, to lugnet.robotics.handyboard)
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| | Malloc
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I'm trying to allocate three large arrays to store data in... Such as the following declared globally: char stoA(4000); char stoB(4000); char stoC(4000); and then some code...not very long, just to capture data and store it in these arrays from the (...) (28 years ago, 12-Jul-96, to lugnet.robotics.handyboard)
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| | Re: status of the expansion board
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Hi I think that Fred's idea for the expansion board is OK, but I'd also like to see a "bare-bones" expansion board for those hardware hackers amongst the HB community. What I mean is just a simple board with a few more analog input's, and two sets (...) (28 years ago, 12-Jul-96, to lugnet.robotics.handyboard)
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| | Re:
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(...) search on "h-bridge" they have a H-bridge that can handle 3A @ 55vdc. I don't know if it can be piggybacked with driver transisters or not but the wonderfull part is if you would like they will send you FREE samples (3ea at a shot, with up to (...) (28 years ago, 12-Jul-96, to lugnet.robotics.handyboard)
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| | (no subject)
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(...) No, it will use just one '374 enable. -Fred (28 years ago, 12-Jul-96, to lugnet.robotics.handyboard)
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| | Re: status of the expansion board
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(...) . . . (...) Where can we find out more about the LEGO sensors? Are they part of some specialized kits? Do they sell them individually? Is there an online catalog? (28 years ago, 11-Jul-96, to lugnet.robotics.handyboard)
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Could someone give me info on where I might find high-current (10-15 Amp) H-Bridges? I am willing to build or buy as necessary. My TIP120/125 bridge is working great, but the motors are drawing a bit more than these transistors should be handling. (...) (28 years ago, 11-Jul-96, to lugnet.robotics.handyboard)
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| | unsubscribe
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---...--- unsubscribe arp4@lehigh.edu (28 years ago, 11-Jul-96, to lugnet.robotics.handyboard)
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| | Re: status of the expansion board
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I'm curious as to how the Polaroid sonar and servo circuits will work. Will they simply steal timer lines from the HB's digital headers, or do you have something more complex worked out? For example, will the sonar's ECHO signal still go to a (...) (28 years ago, 11-Jul-96, to lugnet.robotics.handyboard)
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| | status of the expansion board
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Hi all, Many people are asking about the Expansion Board. It has been on the "back burner" because my publisher is demanding text, not technology. But I do plan to release another rev this summer. My ideas about what should go on it have evolved, (...) (28 years ago, 11-Jul-96, to lugnet.robotics.handyboard)
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| | Re: Newbie Questions (Sensors)
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(...) using the LEGO light and angle sensor is non-trival; custom HW and SW drivers are required. See ftp://cher.media.mit...gosens.txt for details. (...) 0-12 inches is hard, but 0-1 or 2 inches can be done with a simple IR reflectance sensor. See (...) (28 years ago, 11-Jul-96, to lugnet.robotics.handyboard)
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| | Re: L293 vs TI 754410
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Hello there. I've piggybacked three chips, for a total of 2.6A (2 1A chips and 1 0.6A chip, piggybacked with heat sink compound slathered between all the chips and between the top chip and the heat sink I've put on it). I haven't had any problems (...) (28 years ago, 10-Jul-96, to lugnet.robotics.handyboard)
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| | Newbie Questions (Sensors)
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Greetings! I have a couple of "newbie" questions if you please: I ordered from LEGO, their "sensor suite". I managed to wire and use the touch sensor. But I am puzzled about the use and wiring of their Light Sensor (9890) and their angle sensor (...) (28 years ago, 10-Jul-96, to lugnet.robotics.handyboard)
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| | Re: Source for LCD's
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(...) From the components supply list at (URL) compatible retail display is the Hitachi LM-052L. Supplier info for Hitachi parts is available at (URL) Other valid manufacturers/part numbers: Alps LDS7A1792A; Optrex DMC16249. (...) Electrically, any (...) (28 years ago, 10-Jul-96, to lugnet.robotics.handyboard)
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| | Re: L293 vs TI 754410
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(...) The TI chips should work fine. You might not get a full 2A, but at least a 50% improvement. (...) The traces can handle it, but the PolySwitch fuse should limit total current to about 4 to 5 A. You might need to remove the fuse and live (...) (28 years ago, 10-Jul-96, to lugnet.robotics.handyboard)
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| | Source for LCD's
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FYI all electronics ((URL) has 3 LCD displays that could be used with the handy board: Optrex DMC-16207 16 char * 2 lines Hitachi LM052L 16 char * 2 lines Sanyo LCM-524-87H4 40 char * 2 lines Price is 12$ each, any model. Can someone confirm (or (...) (28 years ago, 10-Jul-96, to lugnet.robotics.handyboard)
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