 | | RE: Suppliers and rf link
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I bought most of the parts from the following: www.mouser.com www.digikey.com www.jameco.com The 68HC11 will be the most dificult to find. (26 years ago, 11-Dec-98, to lugnet.robotics.handyboard)
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| | Stepper vs DC
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after reading your mails, it seems to me that the dc motor is better than the stepper motor. doesn't the stepper motor offer any advantages over the dc motor? is the stepper motor that bad? edmund. (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Servos for the miniboard
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Jonathan, I would probably go with a futaba servo. I dunno how much torque you need, but for a small(up to .30 cubic inch displacement, maybe even .60) engine, the s148 does the job quite nicely. Tower hobbies sells them for $14, and they can be (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Suppliers and rf link
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Hi friends! I need some help from you, it's being very difficult to obtain the parts to make my Handy Board here in Brazil. I'm buying one from Hong Kong, but I'd like to buy some extra 68hc11s and lcds, between other things. I have relatives in the (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Re. RF data link
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In response to rf link, How about standard wireless modems? I know of a few which are made specifically for this purpose and baud rates are between 300-9600 baud ,you set the rate according to your robots capabilities. If you are interested conact (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Fwd: Re. RF data link
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-- MIME ATTACHMENTS DISCARDED: 1. Content-ID: <0_913320756@inet_ou...aol.com.2> Content-type: message/rfc822 Content-transfer-encoding: 7bit Content-disposition: inline Content-Length: 1259 (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | How to get digital outputs from the handyboard???...???
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hi everyone, i have been trying for the past few days to get digital outputs from the board but with no success. i have been trying to get digitals outputs from the SPI's pins (J6). i have poke to make the port as output port. but the problem now is (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Servos for the miniboard
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I would like to use a servo to operate the throttle of a small gas engine. I am planning on using the miniboard to control the servo. Are there any brands to avoid? Are there any brands that are far better than the rest? Will just about any RC servo (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | How to get digital outputs from the handyboard???...???
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hi everyone, i have been trying for the past few days to get digital outputs from the board but with no success. i have been trying to get digitals outputs from the SPI's pins (J6). i have poke to make the port as output port. but the problem now is (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | How to get digital outputs from the handyboard???...???
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hi everyone, i have been trying for the past few days to get digital outputs from the board but with no success. i have been trying to get digitals outputs from the SPI's pins (J6). i have poke to make the port as output port. but the problem now is (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Stepper vs DC
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It depends. if you are looking for higher top speed and more torque using less power, DC may be the way to go. If you want accuracy but don't want to deal with shaft encoders and the code overhead needed to precisely control and monitor your DC (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | stepper motors from 5 1/4 drives
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Okay, another newbie question: What do I need to take out of the 5 1/4 drive, other than the motor to get this to work? Also, what about drivers for the same? Anyplace I can get more info on this? I have a bunch of old drives laying around. thanks (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Stepper vs DC
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(...) Actually, steppers do have some advantages. 1) If you do not have encoders on DC gearhead motors (or wheels, etc) they are notoriously hard to position accurately. Steppers can be controlled very accurately. Most servo motors cannot rotate (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Do It Yourself RF module????
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Bastiaan: I wanted to suggest that you investigate the Ham Radio community. Some search words to help get you started include PACKET and ARRL. The first is one of the digital communications protocalls used in Ham Radio, and the second is an (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re. RF data link
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If the data tx/rx modules can't handle TTL levels is there any reason to have the interface board at the PC end ?, why not replace the serial cable going to the PC with the rx/tx modules ?. Surely this should work. John (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: DC Motor movement
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(...) Each motor may have slightly different characteristics even though they may be the same brand and model. This is what you are probably seeing. The ultimate solution is to use a feedback mechanism, like a shaft encoder, on the motors and use (...) (26 years ago, 10-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Newbie Questions, Problems & Contributions...
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(...) I've heard the difference is that the buttons, the knob and the sensor ports won't work as expected. Try moving pcode_hb.s19 to the directory that contains the dl executable, or to the present working directory, or to the directory specified (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Question for Fred
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have you tried re-loading pcode_hb.s19 using a downloader program. fred In your message you said: (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Question for Fred
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Hello this is mike, I am writing regarding the handy board. What happened was while working on the handy board, our motor control (the H-bridge) heat sink touch the metal chassis of our robot. This lead to one of the components on our H-bridge to (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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| | Re: Question for Fred
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hello, i use the handyboard for closed loop position control. the handyboard is good for such a task provided that you choose a motor well suited for the task, and an accurate feedback element, such as a (very) linear pot or optical encoder. as for (...) (26 years ago, 9-Dec-98, to lugnet.robotics.handyboard)
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