 | | Re: Microphone and Heat Sensors
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(...) Interesting sounding project Melissa. The trick is to distinguish the doorbell from other ambient sounds heard picked up by the microphone. One approach might be to use the LM567 PLL Frequency Detector. Its a relatively simple little 8 pin IC (...) (27 years ago, 12-Nov-97, to lugnet.robotics.handyboard)
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| | microphones and heat sensors
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I am a highschool intern trying to build a lego robot which models a housepet using the handy board. My task involves the robot sensing a "doorbell" and moving towards the sound. I will need to use microphones to accomplish this and I am wondering (...) (27 years ago, 12-Nov-97, to lugnet.robotics.handyboard)
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| | bit_set and Poke
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Could someone xplain the relationship that bit_set, bit_clear and poke / poke word have ? Specificallt in the bit_set code used for the motor control, 0x0e is placed before the bit values - why ? I geuess this is used to select the motor port, but (...) (27 years ago, 12-Nov-97, to lugnet.robotics.handyboard)
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| | UK SUPPLIERS OF PCBSDate: Tue, 11 Nov 1997 21:40:00 GMT
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Hi John, JJ> I am just writing to see if you still have the PCBs available. If Yeah, I do - the guy I originally emailed hasn't got back to me yet. Neither has anyone else actually! I'm just in the process of enquiring about ordering a Fingerboard (...) (27 years ago, 12-Nov-97, to lugnet.robotics.handyboard)
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| | Re: L239
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Chuck is correct. There are some other subtle differences between the D and E versions but the basic function and capability are the same. John Bachman (...) (27 years ago, 11-Nov-97, to lugnet.robotics.handyboard)
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| | RE: Burning hot motor driver chips.
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(...) I wouldn't say it's partially correct, I would just say that the drive motors used in RC (radio controlled) cars are picked out to make the car go fast, and hence require a lot of current to produce this speed. They are readily available at (...) (27 years ago, 11-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Burning hot motor driver chips.
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So I guess RC servos/motors are regular servo motors and DC motors that have been stripped from RC cars? Are they any diferent from regular servo/DC motors? If not, then why lable them as "RC"? Since the RF component isn't there anymore... :-/ (...) (27 years ago, 11-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Burning hot motor driver chips.
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(...) Well, that's partially correct. The RC cars usually have a speed control/ steering module that incorporates the RF receiver. This module supplies PWM signals to the drive motor and also controls a steering servomotor. Marco A.A. de Oliveira (...) (27 years ago, 11-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Burning hot motor driver chips.
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So am I correct to assume that an RC motor had a built in RF reciever? ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of Mechanical Engineering The Cooper Union for the (...) (27 years ago, 11-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Burning hot motor driver chips.
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(...) I believe that's correct: Radio Controlled devices, RC devices. Marco A.A. de Oliveira assfalk@eece.unm.edu ---...--- Autonom. Robotics (SMART) Project UNM/NASA ACE Center ---...--- (URL) ---...--- (...) (27 years ago, 11-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Burning hot motor driver chips.
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What does "RC" stand for anyway? I don't think it's Radio Control...is it? ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of Mechanical Engineering The Cooper Union for the (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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| | Re: L239
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Jonathan: I have _dozens_ of L293's as well as L298's with motor controller circuit boards i would be pleased to sell to you if you like. L293's for $5.00 canadian. If you would like to see the motor controller, check my website at (URL) under the (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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| | Re: L239
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Hi, I got L293E (the 20 pin DIP package) from Mouser at $2.53 each. 800-346-6873. John Bachman (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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| | Expansion Board
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It would be nice to see a set of raw, addressed digital OUTPUTS (as well as) analog OUTPUTS on the board. Maybe they are already on the handy board itself, however, they are not addressed on the data bus. The IC code libraries needed for this would (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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| | L239
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Does anyone know of a good source for the L293D or th TI SN754410? Future Electronics has them, but they want roughly $9.00 per chip. I am just looking for 4, but I don't want to be charged an arm and a leg to get them. Thanks ___...___ ___...___ (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Burning hot motor driver chips.
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Anthony, As you've no doubt heard, RC motors take much more current than the Handyboard can supply. To control RC motors your only choice is to create a separate H-bridge to drive the motors. You can do this fairly inexpensively with power (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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| | Re: IR devices
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Hi Jeremy! I used the shaft encoder out of a track ball for my robotic project(same thing but a bit bigger). You do not need the IC out of the mouse just take the shaft encoder and use it with a IR led and detector pair. If you are going to use the (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Burning hot motor driver chips.
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Hello, RC car motors pull a lot of current, from 2A to 8A. The L293D chip goes up to 1A peak (for some miliseconds) before it shuts down. I suggest bypassing the L293D chips and using something like the LMD18200. (URL) Good luck, Marco A.A. de (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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| | Project Questions
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Three of us are undertaking a project using the Handyboard as the control system for a class at MIT. Our project, an autonomous blimp, has an unusual set of constraints, but we're hoping that your collective experience might be able to help us (...) (27 years ago, 9-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Burning hot motor driver chips.
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(...) sounds reasonable.. which "car" BTW? Some may be using that very same platform and may have some timely advice for you. (...) sounds like overload/overheating cutoff to me. (...) This is from the Handy Board FAQ : <---snip---> It is possible (...) (27 years ago, 9-Nov-97, to lugnet.robotics.handyboard)
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