Embedded Files
Objectives:
Objectives:
- Line following is a classic controls problem in robotics
- A line is detected using a light sensor
- Using 1 sensor, an edge can be detected
- Using 2 sensors, a line can be detected
- To not overshoot the line, the motor speed and turning rate needs to be limited
- In place of light sensors, the compass sensor can be used to follow a heading
Connections:
Connections:
Vcc(Red) to +3V
Vcc(Red) to +3V
GND(Black) to GND Bus
GND(Black) to GND Bus
Digital Out(White) to P6 and P7
Digital Out(White) to P6 and P7
Set LED Enable to FALSE( makes more pins available for sensors)
Set LED Enable to FALSE( makes more pins available for sensors)
Line sensor challenges:
Line sensor challenges:
(1) Program the robot to go forward, stop when it sees a black line
(1) Program the robot to go forward, stop when it sees a black line
(2) Program the robot to stop at the line for 5 seconds, then go forward until it sees the next line
(2) Program the robot to stop at the line for 5 seconds, then go forward until it sees the next line
(3) Using a second 'traffic light' microbit, send signals if the light is green(go), yellow(slow down), red (stop).
(3) Using a second 'traffic light' microbit, send signals if the light is green(go), yellow(slow down), red (stop).
- If the light is green, the robot will not stop at the line
- If the light is yellow, the robot slows to half speed
- If the light is red, the robot will stop at the stop line until the light turns green
Line Following with one sensor:
Line Following with one sensor:
Partial Code- 1 line sensor(edge sensor)
Partial Code- 1 line sensor(edge sensor)
Line following- 2 sensors:
Line following- 2 sensors:
3 conditions:
3 conditions:
- Sensor 1 sees black line---bear left
- Sensor 2 sees black line-- bear right
- Neither sensor sees black line- go straight
Alternative: Follow a compass heading
Alternative: Follow a compass heading
Below: Linefollower2
Using a Neopixel strip to indicate sensor readings:
Using a Neopixel strip to indicate sensor readings:
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