Hey all,
The brief summary for this project is that I want to make a 2 position encoder for my industrial sewing machine. I want my machine to stop with the needle in the up or down position, have a button that will advance the needle up or down and a button that will produce 3 stitches for backstitching. I plan on using an arduino based circuit for this project.
Here is a link to the machine I have. http://www.westchestersewing.com/wsm/5550/
I have a degree in physics and a some experience in electronics, but I don't have a lot of experience in building power supplies or circuit design in general. I own an outerwear company and I want to modify my machine to make it easier to use.
Here is my main problem right now.
1. From what I can tell my machine seems to be controlled by a magnetic proximity sensor. The proximity sensor is a small 3 pin device and there is a link to a picture of it at the bottom of this page. There is a small square neodymium magnet that gets moved closer to the sensor when the foot pedal is pressed down. However, when I measure the voltage across the pins to the sensor I measure ~8V AC for all pins. When I measure the resistance across the pins of the sensor they don't change with the introduction of a magnetic field. If we look at the picture from left to right (so upside down from what we might normally consider pins 1, 2 and 3), 1 and 3 measure 147.5 k K Ohm, 1 and 2 give 142.1 k Ohm and 2 and 3 2.35 k Ohm.
Can any one tell me what this sensor is and propose a method for sensing and then controlling this circuit with an arduino?
Here is an image of it http://hubbleouterwear.com/Backups/IMAG0074.jpg
The brief summary for this project is that I want to make a 2 position encoder for my industrial sewing machine. I want my machine to stop with the needle in the up or down position, have a button that will advance the needle up or down and a button that will produce 3 stitches for backstitching. I plan on using an arduino based circuit for this project.
Here is a link to the machine I have. http://www.westchestersewing.com/wsm/5550/
I have a degree in physics and a some experience in electronics, but I don't have a lot of experience in building power supplies or circuit design in general. I own an outerwear company and I want to modify my machine to make it easier to use.
Here is my main problem right now.
1. From what I can tell my machine seems to be controlled by a magnetic proximity sensor. The proximity sensor is a small 3 pin device and there is a link to a picture of it at the bottom of this page. There is a small square neodymium magnet that gets moved closer to the sensor when the foot pedal is pressed down. However, when I measure the voltage across the pins to the sensor I measure ~8V AC for all pins. When I measure the resistance across the pins of the sensor they don't change with the introduction of a magnetic field. If we look at the picture from left to right (so upside down from what we might normally consider pins 1, 2 and 3), 1 and 3 measure 147.5 k K Ohm, 1 and 2 give 142.1 k Ohm and 2 and 3 2.35 k Ohm.
Can any one tell me what this sensor is and propose a method for sensing and then controlling this circuit with an arduino?
Here is an image of it http://hubbleouterwear.com/Backups/IMAG0074.jpg