LAOS Laser

h1. LAOS Mainboard v05 - minimal configuration for 2 axis

This page describes the building process of a minimal LaOS board for a 2-axis machine.

h3. Bill of Materials

|1||||Laos mainboard|||||

|3|C1, C3, C8|100nF|Decoupling capacitors for diverse parts|100nF Ceramic capacitor, 5.08mm pin spacing|2112751||721-5240

|1|C7|22nF|Input decoupling for the 7805|22nF ceramic capacitor, 100nF is fine too|1141773||721-5268|€ 0,12||

|1|C4|1000uF|Voltage buffer for the Pololu's, stabilization of Vmot|1000uF capacitor, 5.0mm pin spacing, 10mm diameter; voltage rating at least 1.6 to 2 times VMOT|1855170 (moq 5)|€ 0,65|520-1090|

|3|C6,C10,C11|100uF|Voltage buffer for VCPU and Pololus|100uF capacitor, voltage rating at least 1.6 to 2 times VMOT|1902932||520-0996|

|2|R10, R18, R19|10k|Pullup resistors for the optocoupler inputs and analog input|10 kOhm resistor|9339060||707-7745|

|5|R30, R4, R5, R26, R27|1k|Diverse functions: current limiting resistors for the leds, bias resistors for the high current output transistors, voltage divider for the analog input|1kOhm resistor|9339051||707-7666|

|2|R31, R32|330R|Current limiting resistors for the leds in the output optocouplers|330 Ohm resistor|9339418||707-7622|

|2|R7, R8|2K2|Pullup resistors for the I2C bus|2.2kOhm resistor|9339302||707-7690|

|1|J11|MBED NXP|The microcontroller that's the core of the board|mBed LPC1768 module|1761179|€ 49,73|703-9238|

|1|J4|MAGJACK|Ethernet connector with magnetics|MAGJACK SI-60002-F|1137981|€ 6,27|741-8477|

|1|J11|MBED NXP|Mbed Holder|2.54mm 20 Way 1 Row Straight PCB Socket|9688862|€ 2,84|509-2925|

|1|U2|Hirose DM1B-DSF-PEJ(82) or Molex 502774-0891|SD card holder|Micro SD SMD: Molex 502774-0891 Regular: Hirose DM1B-DSF-PEJ(82)|2064063 / 1764373|€ 2,65|685-0788 / 720-6072|

|1|D1|LEDR|This led indicates that the stepper drivers are enabled.|Low cost 3mm red led|1045372||708-2753 |

|1|D2|LEDY|This led indicates the presence of VMOT|Low cost 3mm yellow led|2080002||708-2769 |

|1|D3|LEDG|This led indicates the presence of a 5V supply for the microcontroller|Low cost 3mm green led|1652494||708-2756 |

|2|IC1, IC2|KB847|Quadruple optocoupler for the endstops/outputs|Kingbright KB847|2001656|€ 2,04|619-2026||

|2|||Socket for optocouplers, 0.3inch wide, 16 pin||1077315|€ 2,17|402-771 |

|1|WUERTH ELEKTRONIK 3WAY PCB connector RIGHT ANGLE 5.08mm|189-6571|€ 0,62|1641987|€ 0,60|PCB Power connector|

|4|JST 4 pin PCB connector B4B-XH-A (LF)(SN)|543-2733|€ 0,16|1516278|€ 0,20|Stepper drivers, Endstop & Laser and I2C|

|2|JST Socket insert BXH-001T-P0.6|353-1591|€ 0,04|1516301|€ 0,05|To add laser power modulation|

|1|FFC / FPC connector|718-8772 (straight, untested)|€ 0,18|1816463|€ 0,30|This connector combines X-axis and endstops!|