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 | | Re: High current speed controllers
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| I designed a high-current H-bridge to use with my Handyboard (the specs are at (URL) heat sinks on the MOSFETs the bridge can control 50A. (You can substitute fets to get more power). The known problems with this design so far are that the power to (...) (27 years ago, 8-Dec-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.806)
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| | Re: encoder function
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| Tom, it seems that your routines measure frequency but Yoni wanted to count transitions. Yoni, the approach is similar to what Tom has done in that you must use the timer input channels to get high frequencies. In the TCTL2 register, set the input (...) (27 years ago, 7-Feb-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.797)
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| | IC 3.x Reg Code
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| Does anyone have a temp 3 week reg code for IC 3.x that I could use?? Im having problems loading the frequency measuring routinues provided on this mailing list and I believe it might be because I'm still using IC 2.8 and the routines have been (...) (27 years ago, 17-Feb-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.794)
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| | Re: I can't beep my handy (again)
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| German Gentile-- I know nothing about Imagecraft C, but here's how the beep function is defined in lib_hb.c (the Interactive C library of functions written for the Handy Board): void beep() { tone(500., .1); } /* 1/2 cycle delay in .5us goes in 0x26 (...) (27 years ago, 14-Mar-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.792)
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| | how to use IR recievers?
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| I remember some lively discussions concerning the use of an ir sensor (like from an ex-vcr) to locate objects, walls, etc. I didn't have a handy board at the time, but saved the messages for the time that I got one. Well that time is now, but I have (...) (27 years ago, 7-Mar-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.790)
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| | Re: how to use IR recievers?
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| At 11:12 PM 3/6/98 -0800, patrick wrote: (snip) (...) If the VCR isn't totally dead, maybe you could plug in what's left of it and probe the leads that used to go to the IR module for a live one? (snip) (...) The HB comes with a modulated IR beacon (...) (27 years ago, 7-Mar-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.790)
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| | Re: H-Bridge
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| Hi talking about the H-Bridge.....we are building one here for a 1.5 kW motor with maximal power output of 2.2 kW. This one works with 400V but is also developped for a current of a little more than 10 A (actually 15A). It will be chopped with a (...) (27 years ago, 19-Mar-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.789)
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frequency
(score: 1.788)
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| | Servos
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| Can you hook up RC servo signal inputs to the motor drivers? It looks to be feasable as both require a pulse width modulated signal but I'm not sure if the motor driver's carrier frequency and range of pulse widths is suitable. Any ideas - it would (...) (27 years ago, 30-Mar-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.786)
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| | Re: Controlling a DC motor 3
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| (...) Actually, the frequency is somewhat important. The faster you switch, the more power will be lost to the switching of the power transistors and the filtering effect provided by the inductance of the motor. At the other extreme, frequencies (...) (26 years ago, 5-May-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.783)
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| | questions on optical encoders
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| Hi, everyone Hi, i am currently doing a thesis topic "Micromouse project". And, I am going to purchase an small optical encoder to measure the speed, acceleration and distance that my mice has taken. My mice is driven by a DC motor, so the opti. (...) (26 years ago, 18-Apr-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.782)
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| | Re: questions on optical encoders
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| On Sat, 18 Apr 1998, Paul wrote: Might I suggest taking a look at US Digital's optical encoders? (URL) have some low cost variants that we used and were very pleased with. I am looking at the data sheet for a "SP-16" <snip> (...) It is 1.78" in (...) (26 years ago, 18-Apr-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.782)
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| | Re: Help!! Polaroid problem!!!
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| (...) residual noise? It was my understanding that the Polaroid module used pulse time differentials to relay distance information. One need only look at the difference in time, between the leading edge of the init pulse, and the leading edge of the (...) (26 years ago, 23-Apr-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.781)
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| | Re: Controlling a DC motor 3
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| (...) Within limits, the rate doesn't matter much. What matters is the ratio of off time to on time (i.e., the duty cycle). Probably, you could change the frequency by an order of magnitude either way and get about the same results. --Will , , __@_/ (...) (26 years ago, 4-May-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.780)
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| | Re: dc motor blues
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| Hi All; Along the same lines, I would LOVE to control my motors so they run at constant speed under varying load. I know that it's theoretically possible to sense the RPM of a PM DC motor by tracking the drive voltage as the commutator makes and (...) (26 years ago, 4-May-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.779)
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| | setting the best PWM frequency for DC motor
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| hello everyone, I found some information on "How do I set best PWM parameters for DC motors?" from the "Robotics Information" homepage, (URL) inside it described that in order to make current to flow steadily in between pulses, you need to satisfy (...) (26 years ago, 23-May-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.779)
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| | Interrupt counter rate
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| Hi everyone. I use a 4 bits binary counter to measure the no. of pulses emitted from a shaft encoder(TTL output) in order to calulate the speed of a DC motor. But i want to know what is the best frequency that the processor should take the bit (...) (26 years ago, 13-May-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.778)
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| | Re: input impedance
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| (...) Hmmmmmm.. as I recall, there are 47k pullups on those inputs. These are used to condition the signals when used as a digital input. The 'HC11 pink book suggests that any input resistance of greater then 10K will "...degrade A/D accuracy." The (...) (26 years ago, 11-Jun-98, to lugnet.robotics.handyboard)
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frequency
(score: 1.772)
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| | Re: R22 - swinging bots
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| (...) Now, that's just rude. It may be appropriate, or even true, but I thought I'd point out the rudeness first. (...) OK, first, your obsessions (or insecurities?) are really creeping (nay, stampeding) into your post here. Second, do you mean two (...) (17 years ago, 15-Jun-07, to lugnet.org.ca.rtltoronto)
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post, frequency
(score: 1.766)
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| | Re: Controling LEGO trains via Decta Control Lab
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| (...) To change the speed of the pulsing, you change the frequency. Frequency is measured in Hz. You want more Hz. To change the speed of the train, you increase either the duty cycle or the voltage. The duty cycle is the percentage of time that the (...) (26 years ago, 29-Oct-98, to lugnet.robotics)
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frequency
(score: 1.759)
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