![]() ![]() ![]() The best-known non-impact printers are the inkjet printer and the laser printer. The dot matrix printer, an impact printer that strikes the paper a line at a time, was a popular low-cost option. ![]() Early impact printers worked something like an automatic typewriter, with a key striking an inked impression on paper for each printed character. Personal computer printers can be distinguished as impact or non-impact printers. In general, more expensive printers are used for more frequent printing or high-resolution color printing. Printers vary in size, speed, sophistication and cost. After filling up a table with the resistance values, it's easy to determine which ones are the two couples of wires connected at the ends of the two coils, and those are the ones we need to connect to the A4988 driver.A printer is a device that accepts text and graphic output from a computer and transfers the information to paper, usually to standard-size, 8.5" by 11" sheets of paper. ![]() This means that the two wires that are connected at the ends will have a bigger resistance those are the ones we need to use. Of those three, two are at the ends of the coil and one is at the middle. We know that the motor has two coils each coil is connected to three wires. To identify the different wires, and which ones I had to use, I had to test the resistance between the six wires. The motors have six wires each, but we need to use only four of them. I found a guide on Instructables in order to understand how to identify the wires connected to the two motors I found in the printer. Later on, I decided to use the 8.2V output to power the Arduino. I am not enough good at reading circuits to understand if this was in some way intended in the scheme, or if the board is broken, whereas other suggested that it may depend on the fact that there is no actual load on the power board. However, by testing with a multimeter, outputs 1 and 2 did not provide any voltage, while output 6 provided 8.2 Volts. ![]()
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