klipper_TOOLHEAD_USB

A brief introduction to the video
board is easy to solder. Friends who download the firmware later must read the instructions for use.
The cost is super low, 20-30 pieces
of tmc2209 with UART function, 2 limit switches, 1 temperature sensor, 2 fan controls, 1 heating rod control, provides acceleration sensor interface, supports ADXL345 and MPU6050.
USB is used for communication, and shielded twisted pair is recommended for low-cost d+d-wiring.
 
Updated on August 2, 2023,
version 0.6 changes the software and can be used stably. Hardware download firmware is better, increase the DIP switch to DOWN, connect the computer to open the stm32cubeProgrammer, select the serial port connection to download, and remember to set the BOOT0 pin to enter the boot mode.
Now the board can only use mpu6050 or mpu9250 for acceleration testing and cannot use Adxl345. In fact, the cost is almost the same and the effect is the same
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In addition to changing the initialization of the interface, the firmware also made underlying optimizations and added serial port DMA and hardware CRC.
There is a problem with the one-click download circuit of version 1.0. It is easy to enter bootload after power on and reset. The temporary solution is to solder the R2 resistor after downloading the program. I will adjust the circuit to get the reset timing right in the future.
The circuit diagram has been updated and the C14 capacitor value has been changed to delay the reset level. You may be unable to connect when you turn on the computer. Just press fluidd to restart the main control.