Lesson 05 – Testing Out Servo Movement

What is OTTO DIY – Otto is completely open source, Arduino compatible, 3D printable robot which you can put together yourself. This is robotics and opensource at it’s best. The robot was designed by Camilloa Parra as a social impact mission to create an inclusive environment for all kids. Learn more about OTTO DIY and grab a kit at www.ottodiy.com.

Software Required : You will need either Otto Blockly or the Arduino IDE to work on this tutorial. Head over to the following page to learn how to get Otto Blockly or the Arduino IDE installed on your machine – https://learning.kidzcancode.com/lesson/lesson-03-programming-your-otto-robot/ . Once you have the tools installed, launch the relevant application i.e. Otto Blockly or the Arduino IDE and get started using the code shown below.

Uploading code to the Otto DIY Robot : To upload the code to the Arduino Nano (brain of your Otto DIY Biped Robot) you will need to make sure you have the Otto DIY robot connected to your laptop/desktop using the correct cable. Then select the right COM (Communication Port) and type of Arduino board using the drop down menus provided at the top of the screen. Once that’s sorted hit the “tick mark” icon to validate your code and make sure you do not see any errors pop-up. Finally hit the “right arrow” icon to have the code uploaded to the Arduino Nano housed within the Otto DIY robot.

Tutorial : As part of this tutorial let’s test out the 6 servos i.e. 2 of the servos connected to Otto’s legs, 2 of the servos connected to Otto’s feet, 2 of the servos connected to Otto’s arm. If you’ve followed the connection diagrams correctly you should have your servos connected to Pin 2, 3, 4, 5, 6, 7 of the Arduino Nano with the buzzer connected to Pin 13. However, before you test things out make sure you’ve got them connected as shown in the circuit diagrams provided earlier in the tutorial. We would also encourage you to get one of the volunteers to validate the connections.

As part of the final codeblock below we test out all the servos at one.

Here’s the Arduino code if you are using the Arduino IDE to work on the Otto DIY robot :

#include <Otto.h> //Requires you to have the Otto libraries installed within the Arduino IDE
#include <Servo.h>
#define LeftLeg 2 // left leg pin, servo[0]
#define RightLeg 3 // right leg pin, servo[1]
#define LeftFoot 4 // left foot pin, servo[2]
#define RightFoot 5 // right foot pin, servo[3]
#define LeftArm 6 // Left arm, servo[4]
#define RightArm 7 // Right arm, servo[5]
#define Buzzer 13 //buzzer pin
Servo servo_2;
Servo servo_3;
Servo servo_4;
Servo servo_5;
Servo servo_6;
Servo servo_7;
Otto Otto;
void setup() {
  Otto.init(LeftLeg, RightLeg, LeftFoot, RightFoot, LeftArm, RightArm, true, Buzzer);
  Otto.home();
  servo_2.attach(2);
  servo_3.attach(3);
  servo_4.attach(4);
  servo_5.attach(5);
  servo_6.attach(6);
  servo_7.attach(7);
}
void loop() {
  //Testing out servo connected to the Leftleg - Pin 2
  servo_2.write(0);  delay(3000);
  servo_2.write(90); delay(3000);
  servo_2.write(180); delay(3000);
  //Testing out servo connected to the Rightleg - Pin 3
  servo_3.write(0);  delay(3000);
  servo_3.write(90); delay(3000);
  servo_3.write(180); delay(3000);
  //Testing out servo connected to the LeftFoot - Pin 4
  servo_4.write(0);  delay(3000);
  servo_4.write(90); delay(3000);
  servo_4.write(180); delay(3000);
  //Testing out servo connected to the RightFoot - Pin 5
  servo_5.write(0);  delay(3000);
  servo_5.write(90); delay(3000);
  servo_5.write(180); delay(3000);
  //Testing out servo connected to the LeftArm - Pin 6
  servo_6.write(0); delay(3000);
  servo_6.write(90); delay(3000);
  servo_6.write(180); delay(3000);
  //Testing out servo connected to the RightArm - Pin 7
  servo_7.write(0); delay(3000);
  servo_7.write(90); delay(3000);
  servo_7.write(180); delay(3000);
  delay(3000);
}

Purchasing the OTTO DIY Robot : To learn more about the Otto DIY robot or purchase a off the shelf kit please head over to the OTTO DIY website at www.ottodiy.com. By purchasing the kit you will be supporting Camillo Parra and the rest of the OTTO DIY Robot team. At the OTTO DIY website www.ottodiy.com you also have the option to purchase the kit without the 3D printed parts, print the parts yourself using your own 3D printer at home.

For those interested in downloading the 3D models for printing using your own 3D printer, you will find a number of OTTO DIY robot re-mixes (3D print models) along with the original project at the Printables website (hosted by the guys who own Prusa). So head over to the 3D models hosted at Printables.com website to see all the different variants of the OTTO DIY robot listed there. If you are just wanting to download the parts for the basic Otto DIY Biped Robot then check out the following link at the main OTTO DIY Biped Robot page at the Prusa website.

For Makers, Creators & Innovators – If you are a maker, hacker and want to put together your own 3D printed robot using off the shelf components then check out this article at DIYODE – 2 Legged 3D Printed Robot. You can source all the components, parts listed above from Ebay/Amazon. If you do that, you are responsible for identifying and sourcing relevant parts, however if you purchase the kit from the OTTO DIY website www.ottodiy.com you will get quality parts including support from the OTTO DIY team.

Learn more about the OTTO Biped Project and join the OTTO DIY Robot community here – https://wikifactory.com/+OttoDIY/otto-diy  and here https://wikifactory.com/+OttoDIY/otto-diy-plus

Questions