Exchange Makeblock Orion Board with Arduino

Projects General Guidance
1

In a MAKEBLOCK XY Plotter I want to exchange the Orion Board with an Arduino-Board ( so I can change the Pin-Allocation and add a SD-Card-Module for example).

To easily switch between the two microcontrollers and so I am not modyfiying the Makeblock-Hardware, I want to connect the Arduino-Pins to a RJ25-socket jack. Then I can simply switch the RJ25 cables from the Orion to the Arduino sockets.*

The motors are connected via the following driver: Motor Stepper Driver

Looking at the picture of the Driver-RJ25-Jack I therefore connected Pins 8 and 2 to DIR and STP , GND to GND, and VIN to V-M.

The Arduino is powered through the power jack (12 V power supply)

However as soon as I've connected the motor and the power supply, I can't use the Serial communication anymore (no answer) and the big chip on the Arduino Board gets very warm, even hot when I try connect more than just the motor.

Is there an obvious mistake in this that I'm missing?

Sadly I am very new to anything hardware related. How could I go about finding the issue here?

Am I missing information you need to give me advice?

Orion Board: Orion Board (Schematic)

Power supply: Power Supply 12V 12.5A

"Schematic": see attached picture; Leftside= Arduino Pins, Rightside = RJ25-socket Pins, RJ25 cable is connected to the driver

*I did see the explanation of how to connect the Driver to an Arduino Board, but I would really like to use the RJ25 –cable solution, so I don't have to solder anything to the MAKEBLOCK-Driver

Schematic.jpg
Schematic.jpg729×332 27.9 KB

2

Sounds like you are overloading the Arduino's linear regulator. Your Orion board may contain a switching regulator/DC-DC Converter/"Buck" Converter. This will be better able to deal with the current demand and the 12V power supply. For most types of Arduino, using a 12V supply means very little current can be supplied before its linear regulator overheats and shuts down. It certainly can't supply enough to drive a motor.

To get suggestions about how to make this work, you must post a schematic showing how you have connected everything (hand drawn is OK) and proper clickable links to the specifications of all components used including power supplies.

3

For my understanding: where is the linear regulator situated? The point where it gets the hottest is on the long chip, a bit below the VIN-Pin .

Is there any way to explain, why Serial Communication with the computer isn't possible in that situation anymore, but for example a LED keeps blinking as it should?

4

The location of the regulator depends on the type of the Arduino, and that's one of several important pieces of information you haven't given us. Please re-read my previous post, and the forum guide in the "please read" sticky post.