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I am just wondering how I can hook up my encoder, which has two outputs (one for pulses and the other one for direction), with the handy board so I can read the number of pulses and also the direction of rotation. Thanx in advance. Hachemi (28 years ago, 9-Jun-96, to lugnet.robotics.handyboard)
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| | (no subject)
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I have finished the H-Bridge, and to my great suprise, IT WORKS!! (party, dude!). I have drawn a schematic diagram for others who may wish to use this circuit. It is posted to cherupakha.media.mit...ze/hbridge with pics in both IFF and GIF format, (...) (28 years ago, 9-Jun-96, to lugnet.robotics.handyboard)
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| | Polaroid info
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FYI: This info is copied out of the HB e-mail archive. There's lots of good stuff in there, it's pretty easy to search as plaintext. -Fred Polaroid 119 Windsor St, Cambridge, MA 02139 tel: 617.577.4681 fax: 617.577.3213 tel: 800.225.1000 ordering (...) (28 years ago, 8-Jun-96, to lugnet.robotics.handyboard)
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| | polaroid range finders
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Where can I purchase the polaroid range finders that are occasionally discussed on this list? Mark mbolding@vision.vsrc.uab.edu (28 years ago, 7-Jun-96, to lugnet.robotics.handyboard)
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| | are you a graduating student?
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If so, please me know if your e-mail address is about to be blown away. I've noted a surge in bad addresses on the list from the .edu sites. also, this is a reminder to all that the way to unsubscribe is to find your e-mail address by clicking the (...) (28 years ago, 7-Jun-96, to lugnet.robotics.handyboard)
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(...) all sensor inputs have a 47K pull-up resistor. If you remove this (by cutting the trace between the sensor input pin and the 47K resistor pack), then the analog inputs are pretty high impedence, like a meg or so. You should get the "M68HC11 (...) (28 years ago, 7-Jun-96, to lugnet.robotics.handyboard)
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Hi! Would you please let me know the input impedance of the AD circuit ? Thanks in advance. hajime (28 years ago, 7-Jun-96, to lugnet.robotics.handyboard)
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| | Re: your mail
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Yes, the h-bridge circuit is very, very, very confusing. Hmm. Well it's in my robot right now, so lemme see if I can remember how it works. Ok, let's see. First, you connect both of the emitters of the PNP power transistors to +6V or whatever. (...) (28 years ago, 6-Jun-96, to lugnet.robotics.handyboard)
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I'm having a little truoble with the H-Bridge described in this mailgroup. I have MOST of the circuit OK.. The power bridge itself, Diodes, etc.. I am also OK with the optocouplers to 2n2907s.. I am just a bit confused with the description if the (...) (28 years ago, 6-Jun-96, to lugnet.robotics.handyboard)
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| | Serial IO
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Yesterday I experimented with the Serial IO code in the FAQ. I have a couple of questions though. Here is the basic program that I wrote to try to understand this stuff: I wrote this into hb_lib.c: void disable_pcode_serial() /* necessary to receive (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
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| | 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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