![]() ![]() However, it can be powered directly from the power supply, which gives 12V. The end stop socket on most Arduino based boards only provides 5V. The device requires a minimum 6VDC in order to function properly. As the device only cost about £3 ($4-$5), the obvious course of action would be to order a NPN type sensor (which would give logic “LOW” voltage while it is not triggered and logic “HIGH” voltage when it is triggered) and instal that with only a small modification. ![]() That would be OK with most control boards (parameters have to be changed in Marlin), but the MKS Gen card’s hardware prevents the use of this type of sensor. Our metal bit is, of course, the print bed. PNP stands for “positive-negative-positive”, that basically means that it is continuously giving voltage in a signal cable, if it is not close to metal and gives zero voltage when it is close. One of the many alternatives of a metal detecting proximity sensor is the one named “LJ12A3-4-Z/BY”, which is quite imaginative if you think about it. I have touched the subject of the available alternatives of a mechanical switch in one of my earlier posts. There are several reasons to do that, one of which is the possibility to use it for the auto level function of your firmware (in my case that is Marlin). You might want to use a metal detecting proximity sensor to replace the mechanical switch on the Z axis of your printer. ![]() This signal then picked up by your control board and triggers certain functions, instructed by the board’s firmware. Which point it hits the mechanical switch and closes (triggers) the signal circuit. The idea of a standard mechanical end stop is, that a signal circuit is open (thus, is not giving a signal) until the print head would travel to one end of its route (determined by the physical dimensions of your printer). Correctly installing a Z axis proximity sensor was a good learning process fo me, so I thought I share my experiences, it might be useful for others. I am building a HyperCube from Tech2C and I have chosen to use that card. If you are into customizing or building 3D printers, you might be using an “MKS Gen” control board. ![]()
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