Difference between revisions of "Revolution Indicator"

Overview

Today, we will make a revolution indicator, which can represent the revolution with the color of the indicator light, the brighter the light is, the faster the motor rotates.

Module List

Module

Other Equipment

• USB cable*1
• Sensor cable*3
• Sensor shell
• Building blocks or other fixation structures

Module Setup

Setup

• Assemble modules and sensors together:
  • Stick the core, battery, OLED and the extension module together;
  • Connect the color LED to pin 4/5 of Hub;
  • Connect the potentiometer to pin A0/A1 of Hub;
  • Connect the motor to pin 1A/1B of motor module;
  • Stick the red core, green extension module, motor module to the yellow battery base;
  • Plug one end of the USB cable into the battery base, and connect the other to the computer.

Programming

Programming Thought

We can just correspond the set value of the potentiometer to the brightness of the colorLED.

Required Program Blocks

• “Motor begin” program block
• “Motor choose” program block
• “ColorLED prepare” program block
• “ColorLED control” program block
• “Variable declaration” and “assignment” program blocks
• “Rotation potentiometer” program block
• “Map” program block

Start Programming

Motor begin ColorLED prepare, connect it to pin 4 of Hub. Variable A is for storing the speed of the motor. Save the value of the rotating potentiometer in A. Map A from 0-1023 to 0-255. Set the brightness of the color LED to A. Set the rotation speed of the motor of interface 1A1B to A.

Test the result
Turing the potentiometer can control the speed of the motor, the faster the motor, the brighter the LED.

Q:It is not obvious only showing the rotation speed through the brightness of light, so can I add an OLED?
A: No problem.

Display A on OLED.

Technical Specification

• For more about the potentiometer, see Potentiometer.
• For more about OLED, see mCookie-OLED.
• For more about motor driver, see Motor driver

Related Cases

• Body Sensation
• Emoticon

FAQ