<p>1. With BOOT and RESET buttons reserved, users can update the firmware via DFU mode by USB.</p> <p>2. Added protection circuit on the thermistor avoids burning the main control chip caused by leakage current from the heating rod.</p> <p>3. Connect the USB witha jumper cap to get it power on, which effectively isolates the main control board DC-DC from USB 5V.</p> <p>4. Reserved I2C interface allows for filament broke and clogged detection, and supports other DIY functions.</p> <p>5. Added anti-flyback diodes on the heating rod and fans' ports effectively protect the MOS tube from being burned due to reverse voltage.</p> <p>6. Anti-reverse connection protection on the power interface prevents users from burning the motherboard when mistakenly connecting the reverse power line during DIY.</p> <p>Specifications:</p> <p>External Dimensions: 40mmx 40mm</p> <p>Installation Dimensions:Hole spacing 31mmx 31mm, M3 screw holex 4</p> <p>Microprocessor: ARM Cortex-M0 STM32F072C8T6 48MHz</p> <p>Input Voltage: DC12V-DC24V 9A</p> <p>Logic Voltage: DC 3.3V</p> <p>Heating Interface: Heating Rod (E0), maximum output current: 5A</p> <p>Onboard Sensor: ADXL345</p> <p>Colour:As shown</p> <p>Material:PCB</p> <p>style:EBB36</p> <p>note:Without MAX31865</p> <p>Due to different batches, there may be differences in product appearance and printed text, which will not affect use</p> <p>Package Contents:</p> <p>1 * Extruder Breakout Board Kit</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>