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 | | Re: Motor Speeds
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| (...) into (...) port. Consider implement PWM (for Motor Control) with second HC11, why not implement DC motor Controller with Frequency Lock Loop to control motor position and regulate motor speed? Suggested Specification: M68HC11 PWM Output using (...) (28 years ago, 24-Feb-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.860)
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| | re: IR frequency (fwd)
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| Connect the ground from the oscilloscope to the HB ground (anyone). Connect the V from the oscilloscope to the + end of the LED driver (or the annode of the LED if it's connected). Adjust the oscilloscope until you get a visible square wave (...) (28 years ago, 30-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.859)
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| | re: IR frequency / o'scope adjustments
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| (...) You want to trigger off of the signal, or maybe the line; the knobs to turn are generally marked "slope" and "level" or something close to this. I usually use a positive slope, I just like the signal to be going in a positive direction at the (...) (28 years ago, 31-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.859)
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| | Re: IR Collision avoidance
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| Well, at risk of being branded a heretic, since you've brought up the issue of modulated IR, I'm going to throw out an observation I've made about the Radio Shack IR sensors which several other people on the mailing list have privately disagreed (...) (28 years ago, 3-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.859)
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| | Re: IR Collision avoidance
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| At any point are you making an effort to detect your 40kHz IR signal? If you use the sharp IR detector to receive your 40kHz signal you are going to get an initial burst when the thing first turns on and then it will average out to zero just like (...) (28 years ago, 3-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.858)
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frequency
(score: 1.857)
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| | LCD and interrupts
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| (...) Actually, that's not quite true. The systick interrupt always runs, and LCD writing happens as _part of_ systick. Any interrupt, by default, disables further interrupts until it's done. Systick is actually different, because it re-enables (...) (28 years ago, 11-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.857)
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| | Re: non-linear motor speed problem
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| (...) Several reasons. Understand that PWM has the effect of controlling the amount of power fed to the motor, power is related to current in a quadratic (p = i^2r), and your current is related to the voltage applied and the motor parameters (...) (28 years ago, 11-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.857)
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| | non-linear motor speed problem
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| I am using servos converted to plain gearmotors as the motive power for my baby bot. Finally I worked out how to add shaft encoders to them. (Found a small opto switch to poke through the inside of the case on the first gear). The servos I am using (...) (28 years ago, 11-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.857)
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| | Re: IR collision avoidance
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| (...) The Radio Shack LEDs should work fine. The trick is that these things are very sensitive to intensity, duty cycle, and frequency stability. To modify intensity change the amount of current flowing through the LED (lower resistor value == more (...) (28 years ago, 18-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.856)
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| | re: ztx614
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| If I have interpreted the schematics correctly almost any npn can be used for the ztx614. The 614 simply provides ground for the IR transmitter with a collector current of about 3ma. The base current is set by the 10k R to about (5/10k) 0.5ma. If I (...) (28 years ago, 17-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.856)
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| | Re: IR Subsystem confusions.
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| (...) It is a useful for wireless communication (one way), beacon detection (the 6.270 boards used it for this) and for collision detection. (...) The part on the Handyboard has a 'center frequency' of 38Khz whereas the Radio Shack part has a center (...) (28 years ago, 28-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.855)
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| | IR for bots
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| Hello everyone, My thinking (albeit limited), has been that simply driving an IR LED with ac (ie:40Khz) as opposed to static dc, is enough to discriminate it from other frequencies like 60 Hz. or whatever. Then, when the detector picks up sufficient (...) (28 years ago, 20-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.855)
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| | System time &square waves
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| I am still having trouble with the my program and thought that I might ask whether there is any code or does anyone know of a way to identify the frequency of digital square waves with the handy board. Joe Martin joema@mpx.com.au (28 years ago, 24-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.855)
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| | Re: HB IR port
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| Hi Terry, I believe the transmitter circuit already include the 40Khz carrier. You need to write code to modulate the carrier with the low frequency of your information that you want to transmit too. You can do it with simple on/off at the lower (...) (28 years ago, 26-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.854)
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| | Re: IR Subsystem confusions.
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| (...) The handyboard consists of an IR transmitter and detector circuits. The purpose of the transmitter (when connected thru the infrared LED) is to produce infrared light waves at particular frequencies. This frequency is controlled by R4 and C6 (...) (28 years ago, 28-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.854)
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| | Thanks to Chuck and Max
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| Thankyou to Chuck and Max for the help with writing this code for reading square wave frequencies.If anyone else can use it here it is.Be careful though it resets the board every few seconds.I think that if this is a problem you could probably (...) (28 years ago, 31-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.853)
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| | Flame Detection
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| In a past e-mail, Yoni Garbourg (sorry Yoni, I couldn't find your email address) posted a message inquiring about flame detection. Adam Cox responded about finding sensors at www.infusionsystems.com. Yoni, what did you decide to use? I have had some (...) (27 years ago, 7-Apr-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.852)
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| | Re: pressure sensors... non-conductive foam
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| Max> Do you think it would also be viable to use a soft Max> NON-conductive foam and then measure the capacitance instead of Max> the resistance to work accurately with lighter pressures? Actually this will work better. I built a grid sensor using (...) (27 years ago, 11-Apr-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.851)
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| | HB Simple Encoder Routines
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| Hey everyone, My partner and I are trying to use the sencdr?.icb and fencdr?.icb routines to keep position measurements of a robotic arm. The encoders are break beam and provide a signal of 4kHz max. We used 4 J-K flip flops to reduce this frequency (...) (27 years ago, 13-Apr-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.851)
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