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LAOS Mainboard v03 » History » Version 17

jaap, 2012-10-01 20:47

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h1. LAOS Mainboard v0.3
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{{>toc}}
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!>DSC_3506.jpg!
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h2. Design files
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The KiCAD design files for this PCB are available on Github, see https://github.com/LaosLaser/Hardware/tree/master/laos-board-rev3
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For a PDF of the schematics, as well as a top view image of the board, see the attachments at the end of this page.
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h2. Bill of materials
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The BOM lists all recommended components. You will need to modify this list to suit your needs. Common choices:
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* Connector types. The HPC laser uses JST connectors. Our reference design uses Phoenix connectors, they are nice but not cheap. You may omit connectors for functions you do not require.
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* The 7805 voltage regulator (U3) is not needed if you have a stable 5V power supply.
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* The pololu steppers (J8,J17,J23,J32) can be omitted if you use external steppers.
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* The TIP110 (or equivalent) transistors (Q1,Q2) and associated components can be omitted if you do not want to switch external 24V loads.
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* The CAN bus transceiver (U1) and associated components can be omitted, as the CAN bus is not in use by the firmware yet.
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* The USB connector can be omitted. USB file systems are not implemented yet in the firmware yet.
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* R2 and R3 can be omitted if you use an Ethernet connector without LEDs (one would suffice, as they both just connect to the power supply).
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The Ethernet connection and the SD card are essential parts of this design. 
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h3. Common parts
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These parts are needed for every board, no matter the type of laser it will be used for.
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|_.Count|_.Component|_.RS Part No.|_.RS Price|_.Farnell Part No.|_.Farnell Price|_.Comment|
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|1|ARM mbed LPC1768 Module|703-9238|€ 49,53|1761179| €49,73|Mbed|
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|1|Hirose DM1B-DSF-PEJ(82)|685-0788|€ 2,22|1764373|€2,65|reverse SD Memory Card connector|
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|2|DIL socket,0.3in pitch, 16 pin|402-771|€ 0,18|1077315| €2,17||
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|2|Harwin M20-7832046|681-6851|€ 5,31|9688862|€ 7,07 |Mbed Footprint|
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|1|MAGJACK SI-60002-F|741-8477|€ 4,38|1137981|€6,27|Network connector (with LEDs: Farnell:1137983)|
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|2|IC KB847|619-2026|€ 1,96|2001656| €1,37|(5 pcs min)|
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|1|2GB SD card|539-7804|€ 9,40| | |SD Card (cheaper at Mycom: € 4,99)|
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|1|100R resistor|707-7587|€ 0,02| | ||
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|1|120R resistor|707-7599|€ 0,02| | ||
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|4|330R resistor|707-7622|€ 0,02| | ||
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|15|1K resistor|707-7666|€ 0,02| | ||
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|2|2K2 resistor|707-7690|€ 0,02| | ||
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|11|10K resistor|707-7745|€ 0,02| | ||
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|5|100nF capacitor|721-5240|€ 0,07| | ||
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|1|22nF capacitor|721-5268|€ 0,12| | ||
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|1|100 µF capacitor (ELCO)|520-0996|€ 0,28| | |min. voltage: 12V|
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|1|1000 µF capacitor (ELCO)|520-1090|€ 1,31| | |min. voltage: 25V (depending on your motor voltage)|
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|1|Red LED|708-2753|€ 0,09| | ||
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|1|Green LED|708-2756|€ 0,11| | ||
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|1|Yellow LED|708-2769|€ 0,11| | ||
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|1|Laos PCB Rev 0.3| |€ 15,00| | |Available from our WebShop: http://wiki.laoslaser.org/index.php/WebShop|
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h2. Connectors
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h3. Phoenix
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|_.Count|_.Component|_.RS Part No.|_.RS Price|_.Farnell Part No.|_.Comment|
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|7|Phoenix 4-pin terminal block|189-6032|€ 3,05|3705377| |
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|7|Phoenix 4-pin PCB header|189-6127|€ 1,04|3705195| |
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|3|Phoenix 2-pin terminal block|189-6010|€ 1,746|3705353| |
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|3|Phoenix 2-pin PCB header|189-6105|€ 0,51|3705171| |
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|1|pin-header 1x4|251-8632|€ 1,056| | |
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h3. JST (HPC LS3020 Pro)
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The HPC LS3020 Pro uses low cost JST connectors on their cables.
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|_.Count|_.Component|_.RS Part No.|_.RS Price|_.Farnell Part No.|_.Farnell Price|_.Comment|
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|1|WUERTH ELEKTRONIK 3WAY PCB connector RIGHT ANGLE 5.08mm|189-6571|€ 0,62|1641987|€ 0,60|PCB Power connector|
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|5|JST 4 pin PCB connector B4B-XH-A (LF)(SN)|543-2733|€ 0,16|1516278|€ 0,20|Stepper drivers, Endstop & Laser and I2C|
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|2|JST 4 pin housing XHP-4|353-1636|€ 0,07|1516266|€ 0,10|For endstop and laser cable (usually provided with laser)|
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|1|JST 2 pin housing XHP-2|353-1614|€ 0,05|1516264|€ 0,05|To add laser power modulation|
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|2|JST Socket insert BXH-001T-P0.6|353-1591|€ 0,04|1516301|€ 0,05|To add laser power modulation|
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_Note_ - You need to modify the cables a bit to connect to the correct pins, see description in the [[Installation_HPC|HPC installation section]]. Connectors may have significant minimum order quantity. You may ask Peter if he has some he can supply when ordering the PCB.
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h3. JST (HPC LS3020)
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The HPC LS3020 uses low cost JST connectors on their cables.
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|_.Count|_.Component|_.RS Part No.|_.RS Price|_.Farnell Part No.|_.Farnell Price|_.Comment|
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|1|WUERTH ELEKTRONIK 3WAY PCB connector RIGHT ANGLE 5.08mm|189-6571|€ 0,62|1641987|€ 0,60|PCB Power connector|
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|3|JST 4 pin PCB connector B4B-XH-A (LF)(SN)|543-2733|€ 0,16|1516278|€ 0,20|Stepper drivers, Endstop & Laser and I2C|
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|2|JST Socket insert BXH-001T-P0.6|353-1591|€ 0,04|1516301|€ 0,05|To add laser power modulation|
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|1|FFC / FPC connector|718-8772 (straight, untested)|€ 0,18|1816463|€ 0,30|This connector combines X-axis and endstops!|
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h2. Pololu Stepper Drivers
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|_.Number|_.Component|_.RS Part No.|_.RS Price|_.Farnell Part No.|_.Farnell Price|_.Comment|
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|2-4|Pololu stepper drivers| | | | |Depending on how many axes your machine has|
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|4-8|8x1 pin-header socket|495-8587|€ 1,25|3419101|€ 0,56|You need 2 for each Pololu|
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The Pololu you need is of the type A4988: http://www.pololu.com/catalog/product/1182
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We recommend a heatsink with the pololu, as sold here: "ultimachine.com":http://ultimachine.com/content/pololu-a4988-stepper-driver-heatsink-kit and here: "reprap.me":http://reprap.me/epages/reprap_nu_4149051.sf/en_US/?ObjectPath=/Shops/reprap_nu_4149051/Products/Pololu
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h2. Other parts
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|_.Number|_.Component|_.RS Part No.|_.RS Price|_.Farnell Part No.|_.Farnell Price|_.Comment|
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|1|7805|398-697|€ 0,23| | |Power regulation (see below)|
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|1|2x4 DIL socket|402-759| | | |Canbus IC holder|
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|1|65HVD251 CAN chip|662-4321| | | |Canbus IC|
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|1|USB connector|719-9438| |1642033| |Usb Host connector|
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|1-2|TIP 110|485-9648| |9294201| |Analog output|
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h3. Power regulation
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If your laser does not have a good 5V power supply built-in, you can add this 7805 power regulator. Note that it will get very hot if you feed it a high voltage. Anything between 7 and 12 volt should be ok. You can use a left-over power adapter to power the board.
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The HPC series have a 5V power output built-in.
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h2. Older versions
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The history of mainboards is available in [[Mainboard_Revisions]]
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h2. Attachments