 | | Re: Ultrasonic maximum timing
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Hey all -- I was wrong about the speed of sound. The mistake I made was forgetting that the sonar measures round trip time, so the constant I experimentally determined for use in my code actually represents *two* centimeters per 143 clock ticks (...) (24 years ago, 18-May-00, to lugnet.robotics.handyboard)
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| | Re: how many servos on handyboard?
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Ray, Whoops, just read my message again, and realised I had stated STEPPER motor, and not the intended SERVO motor. I have used the HB to control 4 SERVO motors. The SERVO's had an external 5V power. The GND of the SERVO supply was attached to the (...) (24 years ago, 17-May-00, to lugnet.robotics.handyboard)
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| | RE: how to drive extra steppers with handyboard
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i ended up using two SSC II's to control the twelve servos on my robot because most of the time the servos connected to the XB would not work. the SSC II servos worked almost all the time. (URL) think this is the web address and the SSC II's connect (...) (24 years ago, 17-May-00, to lugnet.robotics.handyboard)
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| | RE: how to drive extra steppers with handyboard
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Try Scott Edwards SCC II Servo controller. (...) This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. (...) (24 years ago, 17-May-00, to lugnet.robotics.handyboard)
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| | Expansion board cannot handle more than 2 servos
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Hello, Reading the discussion on servos recently, I thought I'd share this info with you. I have advised a few student group projects involving servos and the XB and came to the conclusion that the XB cannot handle more than two or so servos. The (...) (24 years ago, 17-May-00, to lugnet.robotics.handyboard)
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| | RE: how many servos on handyboard?
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Remeber also that you have to cut the motor power trace and use an external 5V source for the motors in this case. The HB itself will output 9.6 V from the motor ports. (...) This message is for the named person's use only. It may contain (...) (24 years ago, 17-May-00, to lugnet.robotics.handyboard)
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| | how to drive extra steppers with handyboard
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I'd like to build a six legged robot. that would need at least 12 servos. Is there a way to control 12 servos or more with the standard handyboard? someone said it's all in the code (using digital outputs) does that mean I could write the code to do (...) (24 years ago, 17-May-00, to lugnet.robotics.handyboard)
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| | Re: how many servos on handyboard?
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(...) Hi If you use the expansion board, you will loose analog input 0 und 1. These two inputs are multiplexed on the exp board, so you get some more analog ports. -Martin (24 years ago, 17-May-00, to lugnet.robotics.handyboard)
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| | Re: how many servos on handyboard?
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The base Handy Board is designed to control 4 DC motors. The DC motor output ports CAN be used to control 4 (four) stepper motors. Remember that a stepper motor needs a square wave pulse continually sent to the motor for operation, and the mark / (...) (24 years ago, 17-May-00, to lugnet.robotics.handyboard)
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| | Re: how many servos on handyboard?
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(...) The deal is this: Servos are different from plain old DC motors. They have gearing and position control circuitry built in. There are four DC motor ports on the basic HB, but no ready-made servo ports. The dual servo routine described on the (...) (24 years ago, 17-May-00, to lugnet.robotics.handyboard)
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| | Stepper Control
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I am a new Handyboard user and would like to control a pair of 5 wire unipolar stepper motors. I followed the links in the FAQ related to steppers which included some IC code. My problem is that my Handyboard won't load that particular code written (...) (24 years ago, 16-May-00, to lugnet.robotics.handyboard)
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| | how many servos on handyboard?
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I'd like to know how many servos the handy board can control. On the FAQ it says 2, in the documentation it says 4 DC motors. what's the deal? (am I stupid? I'm new at this) also, when you plug an expansion board, do you get 6 EXTRA servos? or those (...) (24 years ago, 16-May-00, to lugnet.robotics.handyboard)
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| | Re: Ultrasonic maximum timing
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(...) Except that I don't think it counts at 2Mhz, rather I think it counts at 500Khz (2 / 4 = ECLK) (I may be totally off base here, since I've not read the pink book in about 6 years) that would put your max at 32767/500000 = .0655 at 1000 ft/sec (...) (24 years ago, 16-May-00, to lugnet.robotics.handyboard)
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| | Re: Ultrasonic maximum timing
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(...) I think the register maxes out at 32767. Since it's a 2 MHz processor, this gives: (32767 cycles) / (2,000,000 cycles/second) = 0.01638 seconds Up here in the Rocky Mountains, the speed of sound is about one centimeter every 143 (...) (24 years ago, 16-May-00, to lugnet.robotics.handyboard)
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| | Ultrasonic maximum timing
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Greetings all, I'm using a homebuilt sonar based on Kam Leang's design, which seems to be working quite well. I just have one question with regard to the timing on the input port. I'm using the same sonar driver as for the polaroid - right now I (...) (24 years ago, 16-May-00, to lugnet.robotics.handyboard)
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| | Re: Fwd: hellofriend
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(...) SCAM ! (not SPAM). These Nigerian attempts are well publicised in the media in Australia. They used to arrive by snailmail (my deceased father got one). Email ! moving up in the world ! People have been fooled, the scam is the 5% they remove (...) (24 years ago, 15-May-00, to lugnet.robotics.handyboard)
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| | Re: Fwd: hellofriend
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I've been getting snail mail from this same group for years, always offering to let you have a third of some huge sum of money if you will only help them smuggle it out of their country and into your account. What they actually want is access to (...) (24 years ago, 15-May-00, to lugnet.robotics.handyboard)
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| | RE: Fwd: hellofriend
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What's puzzling is why they thought an Handiboard mailing list was the place to find new pigeons... | -----Original Message----- | From: Keith Hearn [mailto:khearn@legato.com] | Sent: Monday, May 15, 2000 1:35 PM | To: Meabadboy@aol.com | Cc: (...) (24 years ago, 15-May-00, to lugnet.robotics.handyboard)
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| | Re: Fwd: hellofriend
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(...) A sad attempt at a con job. They claim they want yo give you custody of $35M (of whoich you're supposed to keep 30%), and all you have to do is send them your bank account number. Somehow I rather doubt a legitimate offer of this sort (if this (...) (24 years ago, 15-May-00, to lugnet.robotics.handyboard)
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| | Re: using 3v motors?
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In theory yes. Since the motor will be powered by the aux power supply only, as long as it is at 3 volt, it should be OK. (am I right, Prof. Martin?) -- Ray Wayne Crosbie <wcrosbie@home.com> wrote in message news:FuKHs7.B7v@lugnet.com... (...) 400 (...) (24 years ago, 14-May-00, to lugnet.robotics.handyboard)
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