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Morpheus-STM32 (work in progress)

A cheap 3D printer controller board for use with a "Blue Pill" STM32F1 generic board. Inspired on http://reprap.org/wiki/SinapTec

Design goals:

  • Follow the KISS Principle
  • Low cost
  • Single layer copper board
  • DIY-able (easy to make via toner transfer)
  • Only through-hole components
  • The very basic a printer would need
    • Keep bed circuit separated/optional (if you are making a PLA only printer without a heated bed, you don't need to populate the bed circuit zone)
  • Open Source Hardware, made in Open Source Software

Features:

  • 4 Pololu-like steppers (X, Y, Z, E0)
  • 3 mosfets (Hotend heater, print cooling fan and bed heater)
  • 3 MIN endstops (X, Y, Z)
  • Z Probe pin (in case you are building a delta printer and need the extra endstop)
  • 2 thermistors (for E0 and bed)
  • 2 12V fan connectors
  • I2C and SPI header

WARNING:

  • All logic voltage in this board is 3.3V. Do not connect 5V logic addons/devices without proper level adapting.
  • This board has no reverse current protection, it has a diode to short-circuit and protect the board in case of reverse current, but if you connect power incorrectly you'll still damage components and/or your power supply (there's also a risk of caching fire, so please be careful).
  • This board has no overcurrent protection, please use a fuse on power input (e.g. auto-blade or inline fuse holder), recommended values are of 5A for the main board and 10A for the bed circuit.
  • Check all connections before plugging power.
  • Now for real, check connections...

Notes:

  • Usually, "blue pill" boards have a wrong R10 value (USB pullpup resistor, should be 1.5k but manufcturers place a 10k or other value resistor instead), so you can add a 1.8k in R13. If your board has the correct value or you already fixed it in the board, then leave R13 unpopulated.
  • Hotend sensor uses a 1k resistor pullup (R1). Anyway, if you're having trouble with finding (or creating) thermistor tables, just replace it with a 4.7k resistor and use the usual Marlin tables. Now Marlin has configurable thermistors, you can use thermistor 1000 in configuration.h and choose pull-up, ressistance and beta values in configuration_adv.h