Skills Dev IV: Working with Outputs - Motors & Movement | Project

Project: Weather Display

Objective: create a display to show the weather conditions or temperature for the day using a servo motor to control a plastic arm that would indicate the current weather.

Process:

I started to work with the servo motor by creating a function that would take a number (between 0 and 180) as input to represent the angular position and position the servo accordingly.

After successfully getting the initial function to work, I created two new functions that would (1) take temperature between 0 and 100 degrees as input or (2) take weather (mapped to discrete numbers 1 through 4) and move the servo hand to the corresponding angle for that temperature or weather type.

int servoPin = D2;
Servo myServo;
int servoPos = 0;

void setup() {
    myServo.attach(servoPin);
    Particle.function("Temperature", servoTemp);
    Particle.function("Weather", servoWeather);
    
    Particle.variable("ServoPos", servoPos);
}

void loop() {

}

int servoTemp(String command) {
    int temp = command.toInt();
    temp = constrain(temp, 0, 100); //make sure it's within range
    servoPos = map(temp, 0, 100, 0, 180); 
    myServo.write(servoPos);
    
    return 1;
}

int servoWeather(String command) {
    int weather = command.toInt();
    if (weather == 1){
        servoPos = 0;
    } if (weather == 2){
        servoPos = 45;
    } if (weather == 3){
        servoPos = 135;
    } if (weather == 4){
        servoPos = 180;
    }
    myServo.write(servoPos);
    
    return 1;
}

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Figure 1. Wiring of servo motor onto Argon