 | | 20 X 4 L.C.D Screen?
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I put in an e-mail yesterday about using a different L.C.D, I made a mistake and said it was a 20 X 8 I meant a 20 X 4. I thought that there was a way to use a 20 X8 L.C.D instead of a standard 16 X 2. My question is is this possible, I thought I (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | System time
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Hi, Have anyone developed a system time on the handy board ? Please advice me... Regards, James (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | RE: basic trigonometric functions on the handyboard..
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Wouldn't it be easier to just use the cosine function itself? x = cos y You know x, but you want to find y. Pick a y (maybe 45 deg) and calculate the x. Use successive approximation to determine y within a tolerance. Almost like calculating a (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Re: Polaroid 6500 Sonar Problem
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I would also like to know about this. please respond. =) chen (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Re: HB v1.2, IC v3.1 and ir functionality
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Thanx for the pointer. I got it working with some help from this list. Thanx again, Ed (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | basic trigonometric functions on the handyboard..
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Hi. We've been trying to build an algorithm which will allow our HB to travel between given points. We need to use the inverse cosine function (cos^-1), how can we do that? Is there a math library which contains this and other trig functions? (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Interfacing HB with bus abaco.
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Do anyone of you have already used a strange bus called ABACO ? I'd like to know if someone of you met it anywhere. Thanks Stefano Falconetti (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Fw: Rs422/485 to RS 232 interface
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---...--- (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Rs422/485 to RS 232 interface
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Does anyone can suggest me where to find a simple scheme of an interface from Rs422/485 to RS 232 ? I know that a lot of them are on the web, but where exactly ? Thanks Stefano Falconetti (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | RE: Polaroid 6500 Sonar Problem
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Hi, On this page ((URL) says to install a .1uF capacitor at C7 on the sonar board. My team basically did everything you are talking about, plus install the cap, and everything seems to work fine for us... hope this helps, I'm not sure what the (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Re: basic trigonometric functions on the handyboard..
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A lookup table will be much faster if you can afford the memory space. -----Original Message----- From: Guy & Gad Berg <gberg@netvision.net.il> To: handyboard@media.mit.edu <handyboard@media.mit.edu> Date: Tuesday, March 09, 1999 3:21 AM Subject: (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Polaroid 6500 Sonar Problem
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I'm having difficulty getting my sonar rangefinder to work properly. I've got a fully operational Handy Board with a fully operational Expansion Board plugged into it (both purchased assembled from Gleason and used extensively already without (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Sharp GP2D05?
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hello anyone tried interfacing the Sharp GP2D05 sensors to the handyboard before? i'm thinking of buying some as i need a reliable and cheap digital(Yes/No) sensor. from what i can understand, there are 4 wires, Vin, Vcc, Gnd and Vout. the Vcc, Gnd (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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| | Re: nonvolatile memory
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(...) Try Dallas Semiconductor. Curt Mills, WE7U hacker.NO_*SPAM@tc.fluke.com Senior Methods Engineer/SysAdmin "Lotto: A tax on people who are bad at math." -- unknown "Windows: Microsoft's tax on computer illiterates." -- WE7U (26 years ago, 8-Mar-99, to lugnet.robotics.handyboard)
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| | Re: nonvolatile memory
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(...) Actually the DS1225Y is a 8Kx8 NVRAM chip. The correct Dallas part for the HB is a DS1230. Another option is the Simtek EEPROM backed (no battery) chips. They have the same package as a standard RAM chip, whereas the higher profile Dallas (...) (26 years ago, 8-Mar-99, to lugnet.robotics.handyboard)
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| | Re: nonvolatile memory
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You need to either 1. build a battery circuit that connects to the power pins of the memory chip or 2. Buy nonvolatile memory -phil (...) (26 years ago, 8-Mar-99, to lugnet.robotics.handyboard)
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| | Re: nonvolatile memory
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(...) You can get a RAM Module with built-in battery. Don't remember the name but they are out there. (...) ---...--- Shoot-to-Win Protect the 2nd Amendment ---...--- (26 years ago, 8-Mar-99, to lugnet.robotics.handyboard)
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| | Re: nonvolatile memory
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Just a thought, you could try one of Dallas Semiconductor's nonvolatile SRAM such as the DS1225Y Cheers, Ranjit (...) -- Ranjit Diol - COMPSys Dowagiac,Michigan e-mail: rsdiol@mich.com website: (URL) (26 years ago, 8-Mar-99, to lugnet.robotics.handyboard)
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| | nonvolatile memory
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Does Anyone know how to modify the handy board so that when the battery is disconnected the memory on the board is not lost? In short I want the HB to have nonvolatile memory so that I do not have to reload the pcode in bootstrap mode every time the (...) (26 years ago, 8-Mar-99, to lugnet.robotics.handyboard)
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| | HB & unmanned vehicle system
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Hi, can anyone help me in devolping an unmanned ground vehicle system using a Hand Board? This is my first experience with the HB, in fact, I'm actually buying it (sorry, but may be you can also tell me where to by one by the internet and what to (...) (26 years ago, 8-Mar-99, to lugnet.robotics.handyboard)
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