 | | 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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| | Re: digital ins
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(...) ... (...) Chuck is right about the correct solutions. For a less correct solution, you can take advantage of the fact that HC parts (including the 6811) have built in voltage limiters that are only good for fractional milliamps (in some cases (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | Re: digital ins
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(...) 5.12 volts (...) Yes. (...) 5.12 volts max, 0 volts minimum (...) The correct solution to your problem is to use an op-amp signal conditioner, possibly feeding into a schmidt trigger if you need some hysteresis. (sp?) You can also rig a zener (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | Adding to the data bus
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After looking at the addressing scheme on the handyboard and determining it is possible to add a number of more outputs and inputs by extending the data lines to another board and using the free lines comming from the 74hc138. I built a robot arm (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | digital ins
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Hi all, At what voltage on the digital ins does one risk damaging the HB? I want to feed an amplified signal to the digital ins on my HB to exaggerate the response of a photosensor in the 2-3V range of its operation. Unfortunately, this means that (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | IC memory usage
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(...) IC 3.1's pcode is structured the same way. -- Randy ---...--- Randy Sargent Newton Research Labs Senior Design Engineer Robotic Systems and Software rsargent@newtonlabs.com (URL) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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