Why do 3d printer limit switch have resistors on ebay?

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Bell Pacocha asked a question: Why do 3d printer limit switch have resistors on ebay?
Asked By: Bell Pacocha
Date created: Sun, Mar 7, 2021 3:47 PM
Date updated: Fri, Jan 7, 2022 5:06 AM

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Those who are looking for an answer to the question «Why do 3d printer limit switch have resistors on ebay?» often ask the following questions:

🔬 Why do 3d printer limit switch have resistors called?

Overview. The basic job of an endstop is to detect when an axis has reached a minimum or maximum bound.. A mechanical endstop is the simplest type of endstop: a simple mechanical switch positioned to trigger when a RepRap's axis reaches the end/start of its motion.. RepRap's Cartesian printers and many other 3D printers all move the printer head (axis) relative to a start position.

🔬 Why do 3d printer limit switch have resistors on board?

Adding lower val pull up resistors just creates heat and wastes power. When ever your limit switch remains depressed, like after a home command, your resistor will be fighting to bring the pin voltage back up to 5 while the limit switch holds it down at 0v. waste & heat.

🔬 Why do 3d printer limit switch have resistors on circuit?

It also importantly needs to be small enough that the pull-up resistors can charge it quickly! When you release a limit switch in NO mode (or press the limit switch in NC mode) it removes the short to ground and allows the capacitor to recharge. It recharges through the weak pull-up to 5v provided by the pull-up resistor and so depending on the resistor used, and the size of the cap, it will recover to the >2V high level in some amount of time.

10 other answers

Limits switches or 'end stops' as they are known to the 3D printing community can be troublesome for Hobby CNC and 3D print setups. Many forums have discussion on how to stop the false triggers and most of it doesn't seem to work 100%. You need 100% accurate limit sensing, 1 false limit trigger can ruin your whole print or CNC job.

The limit switches do not work immediately; you have to enable them first. To do this, I used the console panel inside cncjs . There are a number of GRBL (the firmware that runs in the woodpecker board) settings that apply.

Actually there were very few real problems. The biggest was the X stepper mounting which disintegrated after a few days, the alignment of the motor was out anyway, so replaced with a steel slotted mounting. and the alignment of the Z limit switch, which was totally inoperative (needed a couple of small spacers.

If the Duet fails to boot up with the endstops switches connectors, or if it disconnects from the browser as soon as you trigger an endstop switch, this usually means that you are using microswitch endstops and you have connected to the wrong pins of the endstop connector. 2-wire microswitches must be connected to the outer two pins of the connector, which is not the same as many other 3D ...

Limit Switches and Homing Sensors. Limit switches and homing sensors are ways of determining the position of either the stepper motor shaft itself or of the mechanism that the shaft is powering. Both schemes use switches of some sort that are activated when the shaft or mechanism reaches a certain position.

Basically If temp >110 Turn resistor off Elif temp<105 Turn resistor on The switch on the interface would switch the heating process on and the LEDs one would show if the arduino was on while the other would show whether it was ready to be printed on ( it had reached its target temperature).

I change the driver board to ramps 1.4 with A4988 Stepper driver because they have become very cheap on ebay. ( board + 4 stepper drivers about 20$ incl. shipping) I have supplied the x/y/z steppers with 8 Volt, 12 Volt is to much for those tiny things, with only 5 Volt the drivers won't work. i also limit the current to 300mA (with the poti at drivers)

Here’s a neat trick for your next 3D-printer build or retrofit: a Z-axis sensor using a DIY strain gauge made from SMD resistors. We’re betting it could have plenty of other applications, too.

This meant that a binary progression incrementing in 3Ω steps is easily possible, with 2x 3Ω in series to get 6Ω, and a couple of 1Ω resistors to achieve the required resolution. These are 10% resistors. 2W metal film resistors are available in 1%, but I thought the construction would be so fiddly that it would take too long to make.

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