 | | Re: Pull Up Resistor
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(...) One more thought. I assume you are using a seperate supply (of some sort) for the Sonar module, so be sure to tie the pullup to the HB's +5V! Rick (26 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Pull Up Resistor
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(...) I just checked my copy of the Polaroid Sonar Module documentation, and it does in deed state that the module can sink up to 0.1 mA when ECHO is pulled high. It sounds like your module is drawing around 0.064 mA = ((5V - 2V)/47Kohms), so it is (...) (26 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Pull Up Resistor
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I checked the ECHO signal and found it to be at 2.0V when plugged into TIC3 on the HB. I also applied a pull-up resitor which did send ECHO to 5V when not pinging. However, in both cases, I still had seemingly random positive and negative values (...) (26 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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| | what is poke and peek command
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Hi, How to understand what is poke( 1009, 0x20) and bit set (1008, 0x20) ? What is 0 x20 and 0x30 ? how to interpret it ? when should I use 0x20 ,0x30, or 0x40 ? what is all these ? Please advice ? I need to understand it so that I can proceed to (...) (26 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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| | request o schmetic circuit
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HI, Has anybody has the schmetic circuit on the IC of U5 (74HC244 tristate bus driver) which located on the HD ? If have it , please attach to me. Thank you. rgds, phillip chia (26 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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| | HOW TO UNSUBSCRIBE
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Please, do not send unsubscribe requests to the main Handy Board mailing list. Instead, send them to me, Fred Martin, fredm@media.mit.edu. I am the only person who can remove you from the list. Thank you for your consideration of others on the (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | unsubscribe
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(26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | Re: voltage regulator
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there is probably some other circuit on your board that is drawing too much power. put your finger on the other chips and see if any of them is hot (there shouldn't be any). if necessary, remove all socketed chips to see if you can get the (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | Re: General use PCB
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I too was going to suggest AP having done business with them in the past, however you have to note that they have a 'high density' drilling surcharge. This surcharge is 1 cent for every hole over 24 in 1 sq " of board. Thue "perfboard" (10 x 10 (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | voltage regulator
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The voltage regulator on my board (U13) gets so hot that when i touched it it burned my finger. I am using the recomended 12V 500ma ac adaptor. I have been having problems testing the motor circutry and the red motor lights light up when i turn the (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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