This project contains a 3Dprinter Toolhead PCB for VORON StealthBurner Toolhead
The board has
- RP2040 Microcontroller, connect to Raspberry PI with USB
- TMC2209 for extruder motor
- MAX31865 RTD-to-Digital Converter
- Si7021/HTU21D humidity&temperature sensor
- ADXL345 accrometer
- Two 5pins fan connecter, fit with 2/3/4 wires, 12/24V fans
- A 3pins probe connecter
- A normal NTC Thermistor connector
- A 2pins X Endstop connector
- A 3pins 5V WS2812(Neopixel) LED connector
- A 24V heater connector
You can easily buy a RP2040 chip by about 1USD, it's much cheaper than similar STM32 series MCU today
the RP2040 has some UART interfaces and a USB port, the USB is used for this design
the on-board MAX31865 chip supports 2/3/4 wires, PT100/PT1000 RTD. please notice that you should choose the reference resistor(430R/4.3K) and a capacitor(100nF/1uF) based on your RTD value. If you use an 3wire RTD, please connect the FORCE2 pin to PORCE+, otherwise connect it to GND. Please make sure that your wiring is correct. Check the Datasheet and Here for more information.
This sensor is used to monitor chamber temp.
DS18B20 sensors are only supported on the "host mcu". A NTC thermistor should work too, so if a RTD sensor is used to measure hotend temp, you can have a try.
is for resonances measurement. Both ADXL343 and ADXL345 should work
support 2wires, 3wires(with speed monitor pin), 4wires(with PWM input and speed monitor)
12V/24V voltage can be set by the jumper. Check Here for more information.
If using 12V fan, be careful that the current required by the fan must not exceed the maximum current that the DC-DC can provide.
The 5V on the board is the LDO output, the output current is limited, and too many lamp beads cannot be connected in series.
be careful about selection on MOSFET, a N-Channel MOSFET with low RDSon at 4.5V
many models can be used, as long as they have same pin out
The inductor is 4x4mm package, as slim as possible(under 2mm height)
Inductor Options
- WPN4012H (Sunlord)
- SPH4012S PH4018 (Sunlord)
- SWPA4010 SWPA4018 SWPA4020 (Sunlord)
- SLW4010 (Sunltech)
- FHD4012 (cjiang)
Buck converter options
- LMR14006
- LMR14010
- LMR54410(not tested)
- MP2451(not tested)
BL9342(not recommended)
please check the schmatic and chip datasheet for more details