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Oscilloscope?
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 Posted: Tue Dec 12th, 2017 02:39 pm
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Bob D
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Thanks David!

I may still get one, but right now all my $$$ are going towards ( 1) remodeling my kitchen and (2) remodeling my O scale layout with new bench work, haven’t run trains in about 2 months!



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BobD
O-SCALE BPRC
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 Posted: Sun Dec 17th, 2017 02:10 am
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bobquincy
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Someone just asked me, nay, challenged me, to design a BPRC control system that could switch on demand from manual control to autonomous and back. Without an oscilloscope there would be no way to develop and test this system.

boB

Last edited on Sun Dec 17th, 2017 02:11 pm by bobquincy



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 Posted: Thu Dec 21st, 2017 03:40 am
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Budd
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DavidT wrote: Bob, I use the Nano v3 to test all my receivers before they go out. It is small and convenient and works for me because I know what waveforms I am expecting. But the refresh rate is very slow relative to a proper scope. So to get reliable results I have had to fiddle with sensitivity, timebase and perhaps some other settings to be a good match for what I am trying to reveal on the screen. A proper scope samples the incoming signal vastly more often. So it shows a level of detail that removes some of the need for the settings to be a good match. A proper scope would be much easier for diagnosing unknown signals. But it is a great tool for getting started. Changes to settings are not saved automatically so when you mess them up and don't remember what you changed you just have to switch off and on to get factory defaults again. Some things such as the static background waveform are irritating. So once you figure out how to switch that off you save that as your new startup default by pressing the A button for 2s and then another brief press to confirm. Regards, David.
David, can you post up what your wave form ends up being, I have an electronic mate who plays around with this stuff (I don't understand of this stuff, if it works I am happy), he had set himself the challenge to build up a R/C controller to use as a DC base station for my H0 layout, but the Mega thingy's and final PWM wasn't to my liking, the motors hummed like crazy and low speed control just wasn't there.I think he would be interested in seeing what your wave form was compared to his effort, no technology/data wanted, he is one of those re invent the wheel people.
Wayne from Oz



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Modelling the 3'6" gauge railways of South Australia of course.
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 Posted: Thu Dec 21st, 2017 03:41 am
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Budd
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DavidT wrote: Bob, I use the Nano v3 to test all my receivers before they go out. It is small and convenient and works for me because I know what waveforms I am expecting. But the refresh rate is very slow relative to a proper scope. So to get reliable results I have had to fiddle with sensitivity, timebase and perhaps some other settings to be a good match for what I am trying to reveal on the screen. A proper scope samples the incoming signal vastly more often. So it shows a level of detail that removes some of the need for the settings to be a good match. A proper scope would be much easier for diagnosing unknown signals. But it is a great tool for getting started. Changes to settings are not saved automatically so when you mess them up and don't remember what you changed you just have to switch off and on to get factory defaults again. Some things such as the static background waveform are irritating. So once you figure out how to switch that off you save that as your new startup default by pressing the A button for 2s and then another brief press to confirm. Regards, David.



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Modelling the 3'6" gauge railways of South Australia of course.
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 Posted: Fri Dec 22nd, 2017 08:49 am
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DavidT
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Budd, I suggest he just sticks a scope on the outputs of my receiver and you will see what motor PWM and servo pulses look like. Change controlling channel positions to see the effect. Plenty examples on the web too. There is nothing special about my pwm/pulses. Regards, David.

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 Posted: Wed Dec 27th, 2017 11:00 pm
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bobquincy
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Of course this PWM Meter is not a substitute for a 'scope but it may be all some of us need: https://www.servocity.com/pwm-meter?utm_source=New+PWM+Meter+and+Low+Voltage+Cutoff&utm_campaign=NEW+PWM+Meter+%26+Low+Voltage+Cutoff&utm_medium=email

This is not everything I would want in such a device, a direct readout of PWM frequency and duty cycle would be nice but we can probably interpolate that from what this shows.

Last edited on Thu Dec 28th, 2017 10:26 pm by bobquincy



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