3D SIMO Kit 3D printer pen ABS, PLA 1.75 mm : Circuit diagram : Page 4

3Dsimo Kit

Device: 3Dsimo Kit

Rev. 1.00 Page 4/18

3 Wiring diagram

The basic diagram of the 3Dsimo Kit is on the following picture (Pic. 1), where the basis is an Arduino

Nano-like development kit along with the motor driver, pins for display connection or 4 functional keys

(plus/minus, extrusion/ejecting the string) and 8 free pins for optional extensions for the pen.

Pic. 1: Wiring diagram of 3Dsimo Kit

The wiring diagram is split into the following parts shown as comprehensive blocks on the schematic:

1. Motor driver, with three inputs (Motor Sleep, Direction Change and Motor PWM), regulates the

power of the motor for string extrusion or changes the direction of extrusion, which causes the

string to eject.

2. User buttons, two for controlling the motor and two for changing parameters shown on the

display.

3. High-power transistor for power regulation of the heating element, which is equipped with an NTC

type temperature sensor, serves for measurement and regulation of the temperature.

4. OLED display, which uses communication over serial I2C bus

There are 2x4 user programmable pins for custom peripherals - 4 digital (2 of them are a serial line

shared with the USB connector) and 4 analog pins.