 | | 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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