 | | Re: expansion board
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the code has not yet been written. My hope was that some people who got expansion boards might want to do some of the work themselves. For example, the code for dealing with the analog ports can be taken from previous code for the 6.270 board and (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | expansion board
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Hi Everyone, I was wondering if someone could point me to where all the software for accessing the Handy Board's expansion board features are located. Specifically, I was wondering if there is code to access the additional A/D ports, servos, (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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(...) OK. I just wanted to make sure I'm understanding the material. So, my guess is that in order to drive the 4 motors off one chip, you would have to ground the other lead of each motor? So, does that mean that there is 2.4 A source from the chip (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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In your message you said: (...) Yes, that is what I mean. -Fred (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Miniboard/Handyboard.
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it is only a difference in software. The Handy Board software does eight levels; the mini board software---which is different---does 16. -Fred -- This message was composed using Articulate Systems' PowerSecretary, a Macintosh-based speech-to-text (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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(...) You mean running FOUR motors uni-directionally from ONE L293D chip, right? ...and TWO motors bi-directionally from ONE L293D chip? (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Miniboard/Handyboard.
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The Miniboard manual says that it can vary the motor speed at 16 levels at either direction. It was mentioned earlier that the Handyboard can vary only 8. Is this correct? I'm seeing that the Miniboard motor drivers has a higher resolution than the (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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I just realized that getting 1200 milliamps running two motors bi-directionally is equivalent to running four motors uni-directionally at 2400 from a total power dissipation standpoint. I.e., there are still 600 milliamps running through each (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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The 600 milliamp limit is per channel, but for a given motor, two channels are wired in series. So you don't get 1200 milliamps per motor but only 600. This would still yield 1200 milliamps per chip, since there are drivers for two motors. Also, if (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | 600 mA Limit
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I was wondering if the 600 mA limit on the motor driver chip is a limit for the total source current of all four motor outputs or for each individual motor output. If its 600 mA for each motor output,...will the chip get hot when running with 4 (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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