Geeetech GTM32 Board

Introduction

GTM32 is a fully self-developed control board by Geeetech for high-performance 3D printers. It keeps Geeetech’s uniformly optimized interface specifications, easy to assemble and with compact layout, high integration and high performance. GTM32 control board (hereinafter referred to as the control board) adopts the current mainstream high-performance Cortex M3 core chip STM32F103, with its running frequency of up to 72MHz.The control board supports up to 4 stepper motors, namely, XYZ axial motor and an extruder. Users can replace the driving modules, such as A4988 and TMC2100 modules, according to their own needs. Besides, it employs the high performance USB serial chip FT232RL, which enables users to manipulate the control board via USB cable. Its output voltage is 12V.

Features

a. Adopting high-performance Cortex M3 core chip STM32F103, with its running frequency of up to 72MHz.

b. Using high-performance USN serial chip FT232RL, manufactured by FTDI, compatible with Windows, OS X, Linux etc. mainstream operation system.

c. The output voltage of GTM32 control board is 12V. It is characterized by dual power supply design, powering up the hotbed and other electronic components respectively. The current for hotbed is 9A and 7A for other parts.

d. The main circuit adopts in-line fuse, with overcurrent protection and reverse protection. The USB power supply interface has a restorable fuse, with its current at 500mA.

e. The control board features three interfaces for PWM fans.

f. Supporting up to 4 stepper motors, namely, XYZ axial motor and an extruder. The common stepper motor drivers are A4988 and TMC2100.

g. Dual temp sensor input: one for the extruder, the other for the hotbed. 100K thermistor is recommended.

h. The control board comes with expansion interfaces for LCD display and SD card, supporting stand-alone printing.

i. With a buzzer on board.

Hardware Resources

Here is a list of the hardware for GTM32 control board.

1. Power supply unit: 12V output voltage

2. Hotbed interface and extruder interface

3. 4 stepper motor drivers (3 for X, Y, Z axis motors and 1 for the extruder)

4. Interfaces for LCD display & SD card.

5. 6 endstop interfaces

6. 3 interfaces for thermistor

7. 3 interfaces for PWM fan

8. 3D Touch interface

9. Serial interface for Wi-Fi module

Diamension: 102mm*84mm* 27.5mm

Weight: 79.00 g

Interface specifications:

Extruder interface: MX (3.0mm-2*6Pin)

Hotbed interface: MX (3.0mm-2*2Pin)

X, Y, Z motor interfaces: XH (2.54mm-12Pin)

Control board Fan interface: PH (2.00mm-2Pin)

Endstop interface: 2x9 Pin (2.54mm -18Pin)

3D Touch interface: XH (2.54mm-2Pin, 3Pin)

Serial interface for Wi-Fi module: 1x8Pin (1.27mm-8Pin)

USB interface: USB B type

LCD interface: FPC1.0mm-12 Pin

SD card interface: FPC0.5mm-10 Pin

Software resources

Firmware:

Host software:

Printing and control software:

http://www.geeetech.com/wiki/images/3/36/SetupRepetierHost_1_00.zip

Interfaces

Introduction to the Interfaces

1. PSU: output voltage 12V

2. Hotbed interface:

1, 2 for hotbed; 3,4 for the wire of measuring hotbed temp.

3. Extruder interface:

1, 2, 11, 12 for extruder motor; 3,4 for extruder fan and air blower; 9, 10 for filament sensor; 5,6 for the wire of heating the extruder; 7, 8 for the wire of measuring extruder temp.

4. LCD interface: connected with LCD display

5. SD card interface: connected with SD card

6. Endstop interface: X_min/X_max, Y_min/Y_max, Z_min/Z_max

 1, 2, 3 for Z_min; 16, 17, 18 for Z_max; 4, 5, 6 for Y_min; 14, 15, 16 for Y_max; 7, 8, 9 for X_min; 10, 11, 12 for X_max. 

7. XYZ motor: connected with the stepper motor for each axis (the sequence can be found on the back of the board).

8. Fan interface: for PWM fan, PH2.0-2 pin

9. USB interface: Connecting the USB cable with your computer.

Subdivision of Stepper Motor

Use jumper caps to subdivide stepper motor. When jumper cap is plugged, it is ON.

Detailed settings are as follows.

Subdivision on the basis of A4988 stepper driving module.

Turn ON/OFF Subdivision MS1 MS2 MS3 OFF OFF OFF full step ON OFF OFF 1/2 step OFF ON OFF 1/4 step ON ON OFF 1/ 8 step ON ON ON 1/16 step