1.5 Development Steps this week. #5 #6

Development Step #5 – Controlling servos using the face position.

o Approach.


o Learning Experience.


I used the Arduino Knob example as a basis for my code.

I changed the functionality of the code below from using a pot meter, to using data from Processing on x and y axis.

Controlling a servo position using a potentiometer (variable resistor)
by Michal Rinott <http://people.interaction-ivrea.it/m.rinott&gt;
modified on 8 Nov 2013
by Scott Fitzgerald
#include <Servo.h>
Servo myservo; // create servo object to control a servo
int potpin = 0; // analog pin used to connect the potentiometer
int val; // variable to read the value from the analog pin
void setup() {
myservo.attach(9); // attaches the servo on pin 9 to the servo object
void loop() {
val = analogRead(potpin); // reads the value of the potentiometer (value between 0 and 1023)
val = map(val, 0, 1023, 0, 180); // scale it to use it with the servo (value between 0 and 180)
myservo.write(val); // sets the servo position according to the scaled value
delay(15); // waits for the servo to get there

o Result.

Arduino Code:

#include <Servo.h>
Servo servoY; // create servo object to control a servo
Servo servoX;
int ValX;
int ValY;
byte Processing;
int val; // variable to read the value from the analog pin
void setup() {
ValY = 0;
ValX = 0;
servoX.attach(13); // attaches the servo on pin 9 to the servo object
void loop() {
if (Serial.available() > 0) {
Processing = Serial.read();
if (Processing == 'a') {
if (Processing == 'b') {
if (Processing == 'c') {
if (Processing == 'd') {
if (Processing == 'e') {
if (ValX >= 210){
ValX = 210;
if (ValX <= 0){
ValX = 0;
if (ValY >= 210){
ValY = 210;
if (ValY <= 0){
ValY = 0;

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Processing Code: https://gist.github.com/TheVisualG/f531f6f5845106767e749d81085954aa
The servos were not having a set diapason and they broke the wooden parts.

o Sources.

Arduino library examples


Development Step #6 – Installing Raspbian and VNC

o Approach.


I am going to follow the steps mentioned on the official website for the installation of the Raspbian OS.

What I need:
– Raspberry
– Power / micro-USB cable + power supply out-putting more than 1A
– USB splitter
– Mouse
– Keyboard
– Monitor

VNC is a lightweight version of TeamViewer , it basically give you an easy access to a remote device. I will follow a guide on the official website.

o Learning Experience.

• First we download a ZIP file from this page https://www.raspberrypi.org/downloads/raspbian/

• We unzip the archive and take the ISO file
• Then using a software called Etcher we Install the ISO file h􀂂ps://etcher.io/ on the SD card.
• If all goes well we can plug the power cable, the hdmi cable, the keyboard and the mouse and boot into Raspbian.
• Opening terminal.
• The next step is updating the OS to the latest release by typing:

sudo apt-get update
sudo apt-get upgrade
sudo reboot

• If you prefer you can also update the karnel itself by typing:
sudo rpi-update




• first install the viewer on your laptop/PC https://www.realvnc.com/en/connect/download/viewer/
• After that download VNC on the raspberry
• After that install in your router settings assign make the raspberry connection Static and then ping it and find
out what is the IP address https://www.raspberrypi.org/documenta􀢢on/remote-access/ip-address.md

o Result.

I followed the steps but at first my raspberry was not boo􀢢ng anything from the SD card.

I tried another approach, which I found while googling my issue.
Instead of using Etcher, I used a software called SD Memory Card Formatter to format the SD card and after that Win32DiskImager

It did work out and I booted into the OS, after updating it through the RPI-update function it stuck on that screen while booting:


After redoing the whole process several times I finally found the issue:

Not every SD card is compatible and I ended using:

On raspberry zero:


On respberry pi 3b:


And I don’t recommend updating the karnel.

I followed the instructions for VLC and it is working!


o Sources



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