electronics

Electronic Assembly

1. Tools

Since you will need to make your own cables, you will need a crimping tool like these:

• https://www.pololu.com/product/1928
• https://www.electrocomponentes.es/crimpadoras/917-crimpadora-sn-01bm-prensa-terminales-dupont-awg-28-20-crimper-tool.html
• https://solectroshop.com/es/crimpadoras/1822-sn-28b-dupont-terminal-crimpadora.html

There are some tutorials to make custom connectors:

• https://www.instructables.com/Dupont-Crimp-Tool-Tutorial/
• https://youtu.be/GkbOJSvhCgU
• https://youtu.be/K7Qb3DzIX3s

Also you may need a soldering tool and a soldering iron and solder, to solder the cables to the enstops.

2. Put the jumpers in the motor driver socket of RAMPS 1.4

RAMPS 1.4: https://reprap.org/wiki/RAMPS_1.4

3. Attach the RAMPS 1.4 to the Arduino board and attach the motor driver to the RAMPS

Pay attention on the motor driver pinout, do not put it upside-down. The Pololu DRV8825 and the A4988 have the trimmer in different positions

• Pololu DRV8825: https://www.pololu.com/product/2133
• Pololu A4988: https://www.pololu.com/product/1182

Larger image: Arduino-RAMPS-DRV8825

4. Connect the elements as in the figure

If the power suppy is computer ATX, its green cable should be tied to ground (black)

Larger image of electronics schematic

The section of the optional components has more information on how to connect the optical sensor.