 | | motor voltages
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Hello again, Thanks to all who responded to my query regarding motor chips on the Mini Board. Now that I have the more capable motor drivers installed, I want to lower the voltage that my motors see. They are getting straight 9V from the motor chips (...) (28 years ago, 23-Feb-97, to lugnet.robotics.handyboard)
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| | Re: motor voltages
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I (...) Use a couple power diodes in series with the motor power supply, _NOT_ the motor itself. You'll need pretty heafty diodes if you go this route. A typical Si diode drops between 0.6 and 0.7 volts when forward biased. String a few together and (...) (28 years ago, 23-Feb-97, to lugnet.robotics.handyboard)
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| | IR collision avoidance
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Howdy, Is there anyone out there that can explain programming IC for IR collision avoidance. I have read the mobile robots book and everything in the IC manual I downloaded and the 6.270 hardware info but still haven't got a good grasp of the best (...) (28 years ago, 22-Feb-97, to lugnet.robotics.handyboard)
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| | Re: motor drivers
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David, You can replace the L293 on your MiniBoard with the TI SN754410 with no adverse effects. The two chips are pin-for-pin compatible. - Prabal (...) (28 years ago, 22-Feb-97, to lugnet.robotics.handyboard)
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| | motor drivers
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Hi all, I am running some motors from a Mini Board and I want to up the current output of the board. I have noticed that the motor drivers on the MB are the L293 chips just like the Handy Board. Now if the 1 Amp motor chips that many Handy Board (...) (28 years ago, 21-Feb-97, to lugnet.robotics.handyboard)
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| | SPI Routines in IC
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Anybody have any routines or know of any published information for using the SPI with IC for: ...use with Dallas Semi's serial real time clock - DS1202 ...use with 12 Bit serial A/D - LT1298 ...use with Dallas semi's Thermomerter - DS1620 Thanks a (...) (28 years ago, 21-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Digit outputs....
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Rather than trying to figure out the hex for the bits, I use the IC binaray number format, "0b". I set the bits using a binary mask, for example, to set the MOSI pin high, I use: bit_set(0x1008, 0b00001000) then to set the MOSI pin low, I use: (...) (28 years ago, 20-Feb-97, to lugnet.robotics.handyboard)
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| | Digit outputs....
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I've tried to program the digital outputs from the SPI header J6 on the HB with no success. I pump the values into the HB as per instruction form the FAQ note and measure the 4 outputs. No high/low, just some sort of oscillation. What could be my (...) (28 years ago, 20-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Motors & handyboard
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(...) This is also excellent advice. On one R/C car I had, I ended up having to simulate the signal input to the controller because the h-bridge was so screwy but it does save you from having to build your own. On a related note, Radio Shack sells (...) (28 years ago, 19-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Motors & handyboard
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(...) Why not use the H-bridge that is already on the bulldozer? If you work backwards throught the motor driver circuitry, or use the RF controller to send commands to the dozer and see what voltages change you can figure out where the inputs to (...) (28 years ago, 19-Feb-97, to lugnet.robotics.handyboard)
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| | Re: running .s19
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shouldn't you be going into expanded mode, not single chip? (...) (28 years ago, 19-Feb-97, to lugnet.robotics.handyboard)
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| | Re: running .s19
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does your program to anything else other than attempt to leave special mode? You could have it write a value to the motor address ($7000); that would be a more visible indication that it is running. BTW, why is your first instinct to take it out of (...) (28 years ago, 19-Feb-97, to lugnet.robotics.handyboard)
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| | running .s19
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Hello, I am trying to use normal .asm files assembled with as11 on the handy-board. I am not using IC. Although my .s19 file downloads fine I don't think it is being run. My code begins at $D000. I use an ORG statement to set $BFFE:$BFFE to $D000. (...) (28 years ago, 19-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Polaroid Sonar
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Sriram, (...) It is on the outer edge of the module neer the ribbon cable connector. Its exact location is indicated by a circle with a + sign to indicate the polarity. (...) I simply (temporary) soldered to the connector at the end of the ribbon (...) (28 years ago, 18-Feb-97, to lugnet.robotics.handyboard)
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| | reset vector
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(...) Since the Handyboard runs in "special test mode", the vectors are in the $BFxx page. Therefore, you'd want to use $BFFE:$BFFF. -- Randy ---...--- Randy Sargent Newton Research Labs Senior Design Engineer Robotic Systems and Software (...) (28 years ago, 18-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Motors & handyboard
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(...) It has been my experience that it is easier to change the drive circuitry than it is to change the motors. The circuitry is just solder and chips, the motors are mechanical tooling. Driving the Tamiya BullDozer from the HB is certainly (...) (28 years ago, 18-Feb-97, to lugnet.robotics.handyboard)
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| | reset vector
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Hi, I am trying to run a basic assembled .asm file on the handy-board without IC. Since the board doesn't have a reset button, do I use the power on reset (turning board off/on) vector location of $FFFF:$FFFF to indicate the start of my code? -Luke (28 years ago, 18-Feb-97, to lugnet.robotics.handyboard)
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| | Polaroid Sonar
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Recently got my OEM kit from Polaroid Corp. In the readme file which i ftped from cherupakha.media.mit...trib/kent, it says "for robust operation solder a 0.01uF cap to C7 of the ranging board." I browsed through the schematic and component layout (...) (28 years ago, 18-Feb-97, to lugnet.robotics.handyboard)
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| | Re: HELP!
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when using DLM, does the downloader make it to the second stage of the download, indicating "synchronized"? also, when attempting to download "config0c.s19," do you give DLM the command line flag indicating to burn EEPROM and not RAM? you must tell (...) (28 years ago, 18-Feb-97, to lugnet.robotics.handyboard)
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| | Re[2]: expansion board
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Actually I wanted an analogue signal giving some idea of distance. I've done it with a 555 oscillator for illumination, and an opamp demodulator circuit. I was thinking that this might be useful on the expansion board. Richard ___...___ Reply (...) (28 years ago, 18-Feb-97, to lugnet.robotics.handyboard)
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