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Machine number: 18
Build: 24 Apr 2009 -
Useful Links
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Electronics
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Build sequence
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endstops (all through hole, pretty easy)
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N.B. placement of some connectors different from standard RepRap build!
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Four (4) endstops using the RJ45 connectors, for the X axis and Z axis
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Two (2) endstops using the 3-pin connectors, for the Y axis
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stepper drivers (large SMT components, smallest is
SOIC)
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reprap motherboard (fairly spaced out, but the
TQFP can be tricky)
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extruder controller (pretty dense, and there is a TQFP)
Unboxing
Opto-endstops
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| Components | Soldering Y-axis stop | 4-40 screws to align holes | Testing - Off |
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| Testing - On | Test X & Z axis stops | Inspect w/ USB microscope | Pins up close |
Stepper motor drivers
Testing the electronics
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Opto-endstops
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Checked all connections with dissecting microscope set at 0.7 x 10x
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Re-soldered one loose joint
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Used PB-503 proto-board to build a little test rig for both kinds of connection
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All endstops seem to be working correctly
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Stepper motor drivers
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Checked all SMD and through-hole connections with dissecting microscope
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Had to ground the sense line of the ATX power supply unit to get it to power on without a computer attached (following
Masked Retriever's hack)
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Checked that green power LED comes on for all stepper motor drivers
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Burning the bootloader
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Used Arduino 0017 on Mac OS X with
Sanguino 1.4-r1 support
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USBTinyISP needs to have jumper across two pins near cables in order to provide +5V to Sanguino
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Power LED on Sanguino doesn't light up even though Arduino software claims that bootloader burns successfully
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Firmware
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Using RepRap Gen 3 Firmware 1.2
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Don't forget to copy reprap-r3g-firmware-1.x/libraries/* to arduino-00xx/hardware/libraries/ (otherwise you will get an error that it can't find simplepacket.h)
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Debugging
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The power LED never lights up on the Sanguino
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Unfortunately I am now getting the following error: "avrdude: stk500_recv(): programmer is not responding"
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Tried connecting LED to Pin 13 and resetting. It doesn't flash, which suggests something may be wrong with bootloader. When I power with the ATX power supply and hit the reset button, the Debug light flashes 4 times; the power light doesn't come on at all.
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Tried putting a low voltage through the SMD LEDs that indicate Power and Debug (on the LEDs, cathode is marked with green stripe). Both LEDs work.

