A cheap 3D printer controller board for use with a "blue pill" STM32F1 generic board. Inspired on http://reprap.org/wiki/SinapTec
It's design goals are:
- 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
Features:
- 4 Pololu-like steppers (X, Y, Z, E0)
- 3 mosfets (E0 heater, print cooling fan and bed heater)
- 3 MIN endstops (X, Y, Z)
- Z Probe (optional)
- 2 thermistors (for E0 and bed)
- 2 12V fan connectors
- I2C and SPI header
- 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, if you connect power incorrectly you'll damage the components (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 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). If you're having trouble with thermistor tables replace it with a 4.7k resistor.