Leveled Bed >> Auto-Leveling Probe November 10, 2014 01:36PM |
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Re: Leveled Bed >> Auto-Leveling Probe November 10, 2014 02:17PM |
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Re: Leveled Bed >> Auto-Leveling Probe November 10, 2014 03:19PM |
Registered: 10 years ago Posts: 869 |
Well, not spending a lifetime leveling, and re-leveling, and then leveling some more because you transported your printer somewhere and in the process knocked something out of alignment might beat it. Think taking a printer to a show. It'd be great if you could sit it down, plug it in, and start printing, rather than re-leveling the bed.Quote
isonoob
Nothing beats a leveled bed thoughts?
Re: Leveled Bed >> Auto-Leveling Probe November 10, 2014 04:12PM |
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Re: Leveled Bed >> Auto-Leveling Probe November 10, 2014 10:02PM |
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Re: Leveled Bed >> Auto-Leveling Probe November 11, 2014 12:35AM |
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Re: Leveled Bed >> Auto-Leveling Probe November 11, 2014 02:35AM |
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Re: Leveled Bed >> Auto-Leveling Probe November 11, 2014 06:53AM |
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Re: Leveled Bed >> Auto-Leveling Probe November 11, 2014 08:56AM |
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Re: Leveled Bed >> Auto-Leveling Probe November 11, 2014 10:54AM |
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Re: Leveled Bed >> Auto-Leveling Probe November 11, 2014 11:30AM |
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Re: Leveled Bed >> Auto-Leveling Probe November 11, 2014 11:31AM |
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Quote
isonoob
doh! guess my views on bed leveling probe aren't so popular! probably why the shift towards manufacturers including them is happnening... Maybe ill dust off the ole induction probe and give it another chance
Re: Leveled Bed >> Auto-Leveling Probe November 11, 2014 11:54AM |
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Re: Leveled Bed >> Auto-Leveling Probe November 11, 2014 12:21PM |
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Re: Leveled Bed >> Auto-Leveling Probe November 11, 2014 02:05PM |
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I'm no EE, but you might want to double check what the purpose of a pull up resistor is.Quote
ggherbaz
"Care to explain how not enabling the pull up resistor is going to fry the board?"
If you don't set your resistors in marlin, you will pass straight to ground 5 volts. Will this explanation makes more sense to you? . Do you know what happens when you connect together both terminals of a battery?
Re: Leveled Bed >> Auto-Leveling Probe November 11, 2014 03:45PM |
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Re: Leveled Bed >> Auto-Leveling Probe November 12, 2014 09:43AM |
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Re: Leveled Bed >> Auto-Leveling Probe November 12, 2014 11:46AM |
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Quote
ggherbaz
cdru,
Then i'm sorry for the misunderstanding, my thoughts were that without the pull up resistor the mega will throw the 5 volts straight to ground.
Re: Leveled Bed >> Auto-Leveling Probe November 12, 2014 10:18PM |
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Re: Leveled Bed >> Auto-Leveling Probe November 13, 2014 10:22PM |
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Re: Leveled Bed >> Auto-Leveling Probe November 14, 2014 09:36AM |
Registered: 10 years ago Posts: 869 |
The diagram in the thingiverse page is a PNP. It outputs 12V so a voltage dividier is necessary to drop it to a safer 5V level for the microcontroller to use. If you use a NPN sensor with a pull up resistor, that should work, you'll just need to supply more supply voltage to the sensor unless it's able to work at only 5V. The sensor specified appears to need 6V at minimum so it wouldn't be directly compatible with most boards that only have 5V with the endstop headers.Quote
So using a built-in pull-up resistor, I do not understand why a voltage divider is needed on the output of the sensor.
Re: Leveled Bed >> Auto-Leveling Probe November 14, 2014 11:20AM |
Registered: 10 years ago Posts: 45 |
Quote
cdru
The diagram in the thingiverse page is a PNP. It outputs 12V so a voltage dividier is necessary to drop it to a safer 5V level for the microcontroller to use. If you use a NPN sensor with a pull up resistor, that should work, you'll just need to supply more supply voltage to the sensor unless it's able to work at only 5V. The sensor specified appears to need 6V at minimum so it wouldn't be directly compatible with most boards that only have 5V with the endstop headers.Quote
So using a built-in pull-up resistor, I do not understand why a voltage divider is needed on the output of the sensor.
Re: Leveled Bed >> Auto-Leveling Probe November 14, 2014 01:19PM |
Registered: 10 years ago Posts: 869 |
It's just a personal decision when designing a circuit. Are you sinking or sourcing the signal? It's not that one is better or worse than the other, it's usually where is the transistor places in relationship to the load, supply, and ground.Quote
Easy
There is probably a good reason why a PNP device is being used. I guess I may find out why.
Re: Leveled Bed >> Auto-Leveling Probe November 22, 2015 12:18PM |
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Re: Leveled Bed >> Auto-Leveling Probe December 13, 2015 01:30AM |
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Re: Leveled Bed >> Auto-Leveling Probe December 13, 2015 01:32AM |
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Re: Leveled Bed >> Auto-Leveling Probe December 14, 2015 03:49AM |
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Re: Leveled Bed >> Auto-Leveling Probe December 18, 2015 03:51PM |
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Re: Leveled Bed >> Auto-Leveling Probe December 20, 2015 10:40AM |
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Re: Leveled Bed >> Auto-Leveling Probe December 20, 2015 07:27PM |
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