TMC2208

TMC2208 Standalone Mode: Just don't do it. 
KevinOConnor/klipper
Klipper is a 3d-printer firmware. Contribute to KevinOConnor/klipper development by creating an account on GitHub.
github.com
 TMC2208 UART Mode: VREF is set to a max value here, but Klipper decides what to actually use based on the current you specify in printer.cfg Note: in Klipper you do not need to add the second pin with the resistor. (tx_pin) You may use one pin on the board, the UART_Pin
Here is an Instructables page for those who want everything in print.
UART This! Serial Control of Stepper Motors With the TMC2208, Ramps 1.4 and Marlin
UART This! Serial Control of Stepper Motors With the TMC2208, Ramps 1.4 and Marlin: Most people who are involved with DIY 3D printers or just like tinkering with a Maker-Grade commercial printer, will have heard of the Trinamic series of stepper motor driver chips. These little chips are making waves throughout the consumer and p...
www.instructables.com
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TMC2130
Last updated 11 months ago