 | | Re: Question on analog()....
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(...) Right; a voltage divider probably biases the microphone amp ckt at 2.5v. schematics are provided, no? -F (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
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| | Re:Re: Question on analog()....
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(...) Are you sure about this? On page 49 of my copy, it states pretty clearly that the input range is 0 to 5 v. ---...--- Just returned home. I checked the IC Manual of "The Mobile robot Assembly Guide" for the Rug Warrior. On p.66, it reads "When (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
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| | Re: Question on analog(). Negative voltage
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(...) DO NOT SEND NEGATIVE VOLTAGES INTO THE 6811, you will destroy the analog input circuit. Any voltage outside of the 0 to 5 v range is hazardous, unless it is current-limited to a few milliamps. (...) Are you sure about this? On page 49 of my (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
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| | Question on analog(). Negative voltage
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Last time, I learned that the values of analog() corresponds to the voltage between 0 and 5. What if the signal to the analog port is a negative voltage. For example, -2 volt ? In that case, does that mean I have to use another formula or make some (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
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| | encoders??
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Let's see. First, I'd like to put a pair, if possible, of shaft encoders on my robot. (It's annoying not being able to tell how far I've gone!) Anyways, digital inputs 7 and 9 are being used by a 6500 Polaroid sensor and an RC servo. Is it still (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
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| | Strange question
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Has anyone here used Electronic Workbench ? I've got a copy but it doesn't have schematics/models for the darlingtons (TIP120, 125, etc) I'm looking for spice models and ideally an symbol library. (yes it is for simulating various power control (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
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| | Re: voltage/current monitors
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(...) Use a voltage divider (two resistors) to map the battery voltage to a 0 - 5v signal for the A/D converter. Depending on how much current your motors draw, you can put a .1 ohm precision resistor in series with the motor and measure the voltage (...) (28 years ago, 4-Jun-96, to lugnet.robotics.handyboard)
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| | voltage/current monitors
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I'm interested in building a voltage monitor circuit for my robot's 6V battery, and a current monitor circuit for the motors. Is there an easy way to do this, with reasonable accuracy? I'd like to interface both of them to the analog sensors on the (...) (28 years ago, 4-Jun-96, to lugnet.robotics.handyboard)
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| | Re: Yup, it works.
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The PWR light isn't really an indicator of power. It's actually hooked up to the 6811's serial transmit line, so it's supposed to flash when the 6811 is talking serial. the BATT light should always blink when the board is first switched on. It also (...) (28 years ago, 4-Jun-96, to lugnet.robotics.handyboard)
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| | (no subject)
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Cris, I just built my HB last week, I can offer these comments.. The green power LED should flash while you are loading the board through the serial port. Actually, it's more of a flicker, it's just an indicator of serial activity. As far as the (...) (28 years ago, 4-Jun-96, to lugnet.robotics.handyboard)
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