Arduino Servo Project #1
Pulse Width Modulation - Please note that on the Arduino digital pin side you will see some of the pins with squiggle or wavey line. This indicates PWM or Pulse Width Mudulation. This means this data pin can send and recieve mudulated or variable data/current from the sensor that you are attaching. Not just On and Off signals. A servo needs to be on a PWM pin hole because it uses modulated current/data/frequency.
Arduino Simple Servo #2
Arduino Servo Project #3 - With Potentiometer Control
Arduino Servo Project #4 - Control 2 Servos with 2 Knobs.
Arduino Servo Project #5 - Centering your Servo to 90 degrees.
This activity will be important to do and understand before you begin your work on the Crawling Robot. Later you will need to know how to center your servo to 90 degrees in order for the Crawler to work properly. You will refer back to this activity later. Try it out so you understand.
Servo With Button #6 - Using a button to Control a Servo ( If Else conditional statements)
In this activity you can program a button to control the movement of a servo when the button is pushed. This program uses conditional statements that tell the servo IF the button is "off" or "LOW" then do something, Else (otherwise) do something else. You could create a project where the button controls the servo opening a lid or door.
Using the skills and knowledge gained from the servo activities below are some projects that you can attempt.
The Crawling Robot (Engineering Design Process) Prototyping, Iteration, Revision
Most parts were purchased through Amazon.com. Battery can be purchased at better prices through hobbyking.com. After you assemble the parts, hold down all component with a strong rubber band.
Fritzing Wiring Sketch
Special Note: In this sketch, the battery is a 1000mAh 3.7v battery. This is not enough to power the both servos and the Arduino board. It is better to use a small 7.4 v 2S 500Ah or 850mAh or 11.1v 2S or 3S Lipo Battery.
Comment: This project proved to be very successful considering it was our first iteration of the 2 servo crawling robot. We had good success using a 7.4 LiPO purchased through Amazon. I am currently debating whether to go with Hobby King. I have bought LiPo batteries from them before. I recommend using the 7.4v rather than the 11.1v
Adjusting Leg Movements - Think about angles in a protractor.
Code for Crawling Robot
Code should be adjusted for best angles. Do several trial runs and then adjust for angle and speed. See Diagram Below that contains protractors.
When preparing your legs, be sure you bend a small arc as shown below. This will help prevent the legs from moving too much after you glue them the star bracket on the servo.
(I will be experimenting this summer on a rigid leg example using non-flexible material. This may prove to be a better design or not.)
Robotic Arm #1
View the video of the simple robotic arm. Attempt to replicate it. Revise the design to improve it. Then demonstrate it. Have your peers critique it and then revise it again. All the skills learned in the Arduino Servo section are applied in this projects. If you have a 3D printer, use the 3D printer on your 2nd or 3rd iteration to improve the arm.
Robotic Claw or Hand #2
In this project, use the Servo with Button program to activate a claw or arm. Improve the design by using different materials. The goal will be to be able to grasp several different types of objects. In the example a 3D printer was used to print up student designed fingers, but you can use just about anything your imagination leads you to.