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post, frequency
(score: 1.944)
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 | | time sampling under the rcx standard OS
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| Hi list, I'm trying to implement a position regulation (using a motor and a rotation sensor), using for instance a PID (Proportional-Integr...erivative) regulation. I tried to code it in NQC, using the standard OS, but it seems that the RCX loops at (...) (19 years ago, 17-Sep-05, to lugnet.robotics.rcx.nqc)
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post, frequency
(score: 1.944)
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| | Re: Motor control
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| I like 0 to 8 better. Also is there any way to control the frequency at which the PWM works? I find that some of my motors deliver too much at step 1. How about if there was something like: motor( motornum, cycles_on, total_cyles); if you feed (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.924)
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| | RE: Ultrasound Range-Finding
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| (...) The IR sensors on the robot I built have an effective range of about 4 feet. The "downside" of IR sensors are that they are much more difficult to scale in terms of distance. I used a PIC chip to do both illumination and error elimination and (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.917)
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post, frequency
(score: 1.912)
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| | (no subject)
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| (...) I agree that the "software" solution in an HC11 is limiting. It is this limitation that I am trying to overcome in hardware. Rather than shift a bit-pattern out for PWM, I would use three of the built-in timers to accomplish the task. One (...) (28 years ago, 27-Jun-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.904)
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| | Re: IR transmission
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| Jeff, You are right. Several things could be wrong here. First of all the precision resistor is VERY VERY important. This controls the frequency of the carrier signal. The freq is approx 1/(RC) where R = R4 and C = C6 of the the Handyboard IR Tx (...) (28 years ago, 8-Aug-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.897)
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| | IR
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| How does one get the Sharp GP1U52 recievers to acknowledge the 100/125 hz scheme? I've tried using the set_ir_recieve_frequency and ir_counts routines but I only seem to be able to get recognition on port 15. Is there another piece of code that has (...) (28 years ago, 6-Sep-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.891)
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| | RE: sonar (fwd)
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| (...) This is correct, but it isn't too expensive. Scott Edwards has a PIC that will do all of the computation for you. I built a cheesy ultrasonic sensor using a Ramsey Electronics Tone Detector and a modified Rainbow electronics IR-3 board. (total (...) (28 years ago, 18-Nov-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.877)
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| | Re: sonar (fwd)
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| (...) This is true of the POLAROID Ultrasonic Sensor module, but not necessarily true of all Ultrasonic Sensor modules. It depends on the type of Ultrasonic Transducer the circuit uses. The one I built uses a Piezo-Electric transducer available (...) (28 years ago, 23-Nov-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.877)
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frequency
(score: 1.875)
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| | baud rates
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| Hi all, I have a question concerning baud rates and the SCI port. I looked in one of the pink books and found the maximum baud rate it shows is 131.072k baud. I need it to be 250k baud. I also noticed that the baud rate is dependant on the crystal (...) (28 years ago, 5-Dec-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.874)
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| | Re: Assembling the HandyBoard
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| (...) You need that resistor to stabilize the crystal frequency. Try Radio Shack if it is missing from the kit. It doesn't have to be 1/8 watt, 1/4 or 1/2 watt is fine, just make sure it is 2.2 megaohm. (...) So far so good. (...) There is probably (...) (28 years ago, 26-Dec-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.872)
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| | Re: sending signals over power lines
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| (...) Whether the signal is traveling over AC or DC does not matter. What type of current is running through the wires is unimportant. What is important is that your electical wires *already run all over your house*. What these devices are (...) (28 years ago, 27-Dec-96, to lugnet.robotics.handyboard)
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frequency
(score: 1.870)
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| | dual servos
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| Hello world, To richardv@abac.com, I am eagerly awaiting your results. To joe.doubek@privy.com, I'll keep you posted. So far I have gotten to the stage of pretty well ruling out input noise as the cause of twitching servos. I have almost identical (...) (28 years ago, 17-Jan-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.867)
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| | Frequency counting
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| I am having trouble getting my frequency counting code to work.The version I am posting is a sort of test and should print out a frequency integer in Hz after approximately one second of processing.Instead what it does is print out all the values of (...) (28 years ago, 30-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.864)
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| | Re: expansion board
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| (...) I can vouch for this technique, this is basically what I do in my PIC program (except the randomness which is a nice touch BTW) and get rock solid detections. When the frequency is spot on to the center frequency (38Khz for the 1ISU60's) and (...) (28 years ago, 15-Feb-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.864)
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| | IR sensor question
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| I have a very basic doubt regarding the working of the QRD114 sensor. If we connect the sensor as per the illustration in the handy board document, how do we make the emitter transmit IR waves? what will be the frequency of the IR beams (40kHz)? (...) (28 years ago, 6-Feb-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.863)
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frequency
(score: 1.862)
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| | Re: IR Collision avoidance
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| (...) The Sharp IR modules are not being used to detect distance, they are being used simply as non-contact bumpers. This allows one to inexpensively put an arbitrarily long 'whisker' on your robot. The advantage to these things are that they are (...) (28 years ago, 3-Mar-97, to lugnet.robotics.handyboard)
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frequency
(score: 1.861)
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