 | | 6 servos —Student LR
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| | | Hi all, I want to build a six legged walking robot using the handyboard. I want to use 6 servo motors for that. I heard that the handyboard can only control 2 servos, but that there is a servo controller board which can control up to 32 servos, (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | | | | Re: 6 servos —Fred G. Martin
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| | | | This multiple servos thing is reaching FAQ status, and here is how I plan to deal with it. Scott Edwards Electronics sells a cheap ($30 kit, $45 assembled) servo board that drives 8 servos. You can gang them to get 32 servos or even more. The boards (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | | | | | Re: 6 servos —MAR ERICSON
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| | | | (...) Are the digital outputs at 5v high? I think you mentioned on the HB homepage about the serial interface converting RS232 levels at +12 and -12v to TTL levels (5v). I'm not that familiar with the nitty gritty of RS232 so this kinda puzzles me. (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | | | | | Re: 6 servos —Fred G. Martin
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| | | | (...) There are two types of serial voltages: TTL level and RS-232 level. The HB's serial interface board converts from TTL to RS-232 for communicating with the host computer. The Scott Edwards board accepts TTL levels, so an HB pin can drive it (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | | | | | Re: 6 servos —MAR ERICSON
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| | | | | (...) Just to make sure it wasn't a typo...so, the TTL level is "ative low"? Also. Does the Scott Edwards board have the ability to be connected to a computer? or do you need a "TTL to RS232 converter"? (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | | | | | Re: 6 servos and RS232... —
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| | | | (...) From memory of my designer engineer days, the EIA RS232 specification quotes something along the lines of: logical level RS-232 level zero or idle -3V to +15V one +3V to -15V The spec gave maximum slew rates for signals and such specifics such (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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