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(...) I too like working within the existing constraints. It makes you creative. Still. I'd kill for a stall sensor. (22 years ago, 8-Aug-02, to lugnet.robotics)
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| | Re: LEGO Purism
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(...) Despite my urge to make new and better(?) sensors, Lego makes a stall sensor! Stick a rotation sensor in the drive train and timeout a change in count value. (Same way as automated braking system do.) JB (22 years ago, 9-Aug-02, to lugnet.robotics)
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| | Re: LEGO Purism
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(...) First of all, to Gaff: I also think it is desirable to work within the LEGO system, and I don't consider my mind 'sick and twisted'. Well, maybe a *little* twisted! <grin> To Paul: Try running a wire from the RCX power output, to your motor, (...) (22 years ago, 9-Aug-02, to lugnet.robotics)
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| | Re: LEGO Purism
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(...) Yes. Guess I'm going to have to do it. The more I think about it. The more attractive the programming and mechanical issues become. Like: I have a two-motor setup. How do I monitor both or do I go for a synchro drive instead? Do I want to (...) (22 years ago, 9-Aug-02, to lugnet.robotics)
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| | Re: LEGO Purism
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(...) Erh, I'm not so sure about that? One side of the sensor input is ground, the other side is the input to the voltage measurement circuitry. The motor output on the other hand has two connection, which are either ground and +8(ish) or +8 and (...) (22 years ago, 9-Aug-02, to lugnet.robotics)
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| | Re: LEGO Purism
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(...) One way to do this, without adding any hardware is to check the internal battery voltage. I'm not sure if it's possible with the standard firmware v2.0 (it wasn't possible with 1.0/1.5) but you can do it with replacemet firmware, like BrickOS (...) (22 years ago, 9-Aug-02, to lugnet.robotics)
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| | Re: LEGO Purism
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(...) Neat! I guess the only drawback is that you don't know *which* motor stalled - but most applications can probably live with that. Anyway - you *CAN* do this with the RCX 2.0 firmware. In NQC, you can call x = Batterylevel () ; ...the result is (...) (22 years ago, 9-Aug-02, to lugnet.robotics)
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| | Re: LEGO Purism
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(...) A little experimentation shows that you are right :-) or should that be :-( (22 years ago, 10-Aug-02, to lugnet.robotics)
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| | Re: LEGO Purism
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(...) I don't suppose you have some code for this do you? I tried this some while back with no success :-(. I found that the battery voltage seemed to fluctuate too much for me to be able to detect a stall condition with any degree of certainty. (...) (22 years ago, 10-Aug-02, to lugnet.robotics)
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| | Re: measuring motor voltage on sensor input
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Quoting Paul Andrews <paul@jools.net>: (...) How about a simple resistive divider across the motor output, say two 1 Kohm resistors, with the motor on the top of the two and the sensor input on the midpoint, so it sees the battery divided by two? (...) (22 years ago, 10-Aug-02, to lugnet.robotics)
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