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LAOS Mainboard v05 - minimal configuration for 2 axis

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

Bill of Materials

1 Laos mainboard
3 C1, C3, C8 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 or Molex 502774-0891 SD card holder Micro SD SMD: Molex 502774-0891 Regular: Hirose DM1B-DSF-PEJ 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!