 | | microphone as a sound sensor?
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Hi all, has anyone interfaced a microphone to an analog input of the HB? I've amplified the signal with an op-amp (LM386) but can't figure how to integrate the (AC) signal into a usable voltage range for the HB. I don't think that just rectifying (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | Manipulate the LCD in assembler
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I have write a code for manipulate the LCD in the handy board. Because i can't use a battery backed RAM, i need to write in assembler. Well , i'm really read all the FAQ for LCD and for Handy board (including the apendix B for the 6270) .I'm using (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | Help!!!! Handy Board Problem
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Hi! I'm currently assembling the handy board, and i got to the stage where i have the bare minimum to run IC. The problem starts when I try to send commands from IC (ver 2.851) to the handy board (running v 2.81). About 85% of the time i get the (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | 68HC11's inputs
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John, Thanks for the excerpt. Ouch. On first read, it looked like the 6811's input pin was beefier than I had originally thought. On my second reading, I realized that my hack probably is in fact outside the specs for the chip, so if you're trying (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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| | Re: digital ins
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(...) From the pink book (rev 3): pp. 2-24,25 "2.4.3 Internal Circuitry - Digital Input-Only Pin ...When the pin current is increased to very high levels (typically more than 100mA, specified limit is 25mA), physical damage can result. [...] As (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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