3D Printer Motherboard ESP32 240MHz MCU Control Board with 5 Pcs A4988 Stepper Motor Driver DC12‑24V Item Type: 3D Printer Motherboard Material: PCB Motherboard Model: For MKS TinyBee V1.0 MCU: ESP32 WROOM 32U MCU Frequency: 240MHz Memory: 520K Input Power Supply: DC12-24V <20A Heater: 2 heater ends, 1 heater bed Temperature ADC: 3 NTC100K: TH1, TB, TH2 (requires jumper selection) Motor Interface: 5 axes 6 motor interface (dual Z axes parallel connection) Step Drive Mode: STEP DIR Moode Drive Signal: Supports external high current drive Subdivision Settings: Dial switch LCD Interface: Supports LCD 2004 12864, MKS MINI12864 V3 Serial Port: Reserved USART2 for MKS TFT series screen End Stop: X, Y, Z, MT_DET 3D Touch Control: Support Power Protection: Supports power reverse protection and power peak protection Motor Back Electromotive Force: Can be absorbed by phase sequence resistance to preserve stepper driver Firmware: For Marlin2.0. X Firmware Update Method: USB drive upload Small Memory Card: Shipped without card A4988 Driver Introduction: A4988 is a complete micro stepper motor driver with built in converter, easy to operate. The bipolar stepper motor can operate in full step, half step, 1/4, 1/8, and 1/16 step modes, with an output drive capacity of up to 35V and ±2A. A4988 includes a fixed off time current regulator that is in slow or mixed decay mode. The A4988 converter is the key to easy implementation. The step input only requires one pulse to drive the motor forward one microstep. There is no phase sequence table, high frequency control line, or complex programming interface. The A4988 interface is very suitable for situations where complex microprocessors are unavailable or overloaded. A4988 Driver Features and Advantages: 1. Low RDS (on) output 2. Automatic current decay mode detection or selection 3. Mixing with slow current decay mode 4. Synchronous rectification, low power consumption 5. Internal undervoltage locking 6. Constant current protection 7. 3.3 and 5V compatible logic power supply 8. Thermal shutdown circuit 9. Grounding fault protection 10. Load short circuit protection 11. Five selectable stepper modes: full step, 1/2, 1/4, 1/8, and 1/16