 | | RCX Output
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| (...) Can anyone confirm the output characteristics of the RCX? It is my understanding that PWM is used to control RC servos and not to power them. Has anyone put a scope on the RCX's outputs to see what they look like? If the info is available, I'd (...) (25 years ago, 15-Dec-99, to lugnet.robotics)
| | | | | Re: RCX Output
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| Hi F'Amos, I just now put a scope on the motor output ran an NQC motor test program. At OUT_FULL the motor output is about +7V DC. At OUT_LOW the motor output is a pulse train of 1ms 7V pulses at about 125Hz. The low level depends on the motor load (...) (25 years ago, 15-Dec-99, to lugnet.robotics)
| | | | | Re: RCX Output
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| So if you need a 1, 1.5 & 2ms pulse for controlling a servo and you said the low setting in NQC = a 1ms pulse, are there other matching motor speed settings to get a 1.5 or 2ms pulse? (...) Joel Shafer joel@connect.net (25 years ago, 15-Dec-99, to lugnet.robotics)
| | | | | Re: RCX Output
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| Hello Joel, Attempting to drive an RC servo directly from the RCX is NOT a good idea! The servo is a three wire device; +4.8V to +6.0V for power (usually the red wire), an approximately 40Hz pulse train of 1.0 to 2.0ms pulses at 0V and +5V logic (...) (25 years ago, 15-Dec-99, to lugnet.robotics)
| | | | | Re: RCX Output
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| (...) The pulses are 1ms, 2ms, 3ms....7ms, 8ms. The 8ms case is sort of a degenerate case since the period itself is 8ms, so an 8ms pulse winds up being continuous power. Dave Baum (25 years ago, 16-Dec-99, to lugnet.robotics)
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