View source for VelTek shield motor step

= Required hardware components =
To complete this exercise you need for following:

{|
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[[File:IMG_arduino_uno.JPG|200px|thumb|Arduino Uno (or similar)]]
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[[File:IMG_veltek_shield_r2.JPG|200px|thumb|VelTek shield (r2, blue)]]
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[[File:IMG_motor_w_encoder.JPG|200px|thumb|DC motor w. encoder]]
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[[File:IMG_12v_acdc_adaptor.JPG|200px|thumb|12V AC/DC adaptor]]
|-
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[[File:IMG_usb_a_b_cable.JPG|200px|thumb|USB A to B cable]]
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[[File:IMG_motor_encoder_cable.JPG|200px|thumb|Motor cable]]
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[[File:IMG_small_flat_head_screw_driver.JPG|200px|thumb|Small flat-head screw driver]]
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[[File:IMG_cheap_usb_hub.JPG|200px|thumb|Recommended: cheap USB hub]]
|}

= Required software =
* Serial terminal program with logging capabilities. We recommend [https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html Putty] which is available on Windows/Linux/Mac.
* Math program capable of importing numbers from a text file. Matlab or [https://www.gnu.org/software/octave/download.html Octave] (free) is recommended, but Microsoft Excel can also be used.
* Arduino sketch (C/C++ program for the Arduino) [[File:Veltek-shield-motor-ab-encoder-1.0-beta1.zip]] that starts the DC motor and count pulses from the encoder on the motor.
* [https://www.arduino.cc/en/Main/Software Arduino IDE] to compile and upload the sketch to your Arduino. This is available on Windows/Linux/Mac

= Setup =
[[File:IMG_motor_cable_mounted.jpg|200px|float|thumb|motor encoder cable mounted correctly]]
[[File:IMG_arduino_motor_shield_connected.JPG|200px|float|thumb|motor connected to VelTek shield]]
# Mount VelTek shield on top of Arduino. Take care that all pins mate correctly to their sockets before pressing together.
# Connect motor cable to DC motor. The little white plug can only go in one way. When inserted correctly, the orange wire is towards the edge of the circuitboard. (See picture)
# Use screwdriver to connect the red wire to "OUTB" and black wire to "OUTA" on the green terminal on VelTek shield. The red and black wire is for motor voltage that drives the DC motor.
# Connect blue wire to Arduino GND, and yellow wire to Arduino 5V. These wires power the encoder circuit on the back of the motor.
# Connect violet wire to Arduino pin 3 and orange wire to pin 2. These wires carry the output signals from the encoder on the motor.
# Plug the AC/DC adaptor into a 230V wall socket and then insert 12V plug from adaptor into the Arduino.
# Optional but strongly reccomended: Connect Arduino board to USB hub.
# Connect Arduino or USB hub with Arduino to your computer.

= Usage =
When the compiled Arduino sketch has been compiled and uploaded, you can check that it is running by opening the serial monitor in the Arduino IDE (icon in top left of the window). When window opens, make sure that you have chosen "115200 baud" as communication speed in drop down menu. You should see two columns of nubers on the screen. 

To test that motor and encoder works, try to turn the motor axel by hand. You should see the number in the first column increase og decrease. 

Click on the text box in top of the serial monitor window, type a single digit from 1-9 and press enter. The motor should start turning. 1 is the lowest speed (voltage), 9 is max voltage (12 V = 12000 mV). Type 0 and enter to stop the motor (0 V)

= Hardware description =
Todo

= Software description =
Todo