![]() I’m very lucky to have access to a laser cutter. } Depending on the quality of the servo NO_MOVE might have to be adjusted. Try changing loop() to make the continuous servo hold steady in the middle. The same code will make a continuous servo go from full speed backward to full speed forward and back again. This code will make a 180 servo sweep back and forth. PinMode(LED,OUTPUT) // the led built into the ArduinoĬonnect your servo power to 5v, your servo ground to GND, and your servo signal to digital pin 6. Each servo has three pins: ground, power, and signal. From an arduino you can move a servo with ease. I want wheels that keep turning, so I’m going to get a pair of 5v continuous rotation servos. The arduino starter kit comes with 180 degree servos. I’m going to build my circuit with five eyes so that later I can make my robot solve a maze. That number is a measure of the amount of current coming from the 5v pin, through the sensor, and into the A0 pin. When you cover the sensor the numbers will drop towards zero, and when you shine a light on the sensor the numbers should climb towards 1024. If you upload this code to your arduino and open the serial window, you should see numbers crawling up the screen. We can test this pretty easily by putting one end of a photoresistor in the 5v pin of the UNO and the other end in A0. When there is white in front the sensor won’t resist and should allow more current. ![]() When there is black in front of the sensor it will resist a lot of current. Photoresistors are resistors that block the flow of electricity less when light is shining on the built-in sensor. Sensorsįor the eyes I’m going to use some photoresistors. I’m going to use a 9v battery for the power supply. Brain & Powerįor the brain I’m going to an Arduino UNO I have on hand. Working from the bottom-up I’m going to experiment with each part of the robot so that I’m sure I understand how it works, and then I can put all the pieces together. Now that I know where I want to go, I can look at what I have and figure out a route. The difference in the wheel speeds is called differential steering. If the right eye sees black, slow down the right wheel. The brain will know that if the left eye sees black, slow down the left wheel. I’m pretty sure I’ll need two wheels (muscle) and two eyeballs (sensors). They all have a brain, skeleton, muscles, sensors, nerves, and a power source. The robot should stop if both eyeballs see black. I’d like to use the same robot later to solve a maze. The goal is build an inexpensive robot that can follow a black line on a white floor. When I know how far I have to go I can make a time estimate, a cost projection, and so on. Then I’ll work with what I’ve got (B) and try to build a map from B to A. I’m going to start with some high level goals about what this robot should do (A). Got the tools to make the parts? Here are the open hardware laser cutting plans. Want all the bits & bob to follow along? Get the kit here. So you’ve just finished your Arduino Starter Kit and now you’re wondering “what next?” Let’s take what you’ve learned and put it into a line following robot.
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