Published January 31, 2019 © GPL3+

What Should I Wear Today

A fun build for kids! An indicator that shows them what to wear based on the weather of the day.

BeginnerFull instructions provided2 hours691

Things used in this project

Hardware components

Particle Argon

SG90 Micro-servo motor

Li-Ion Battery 100mAh

Solderless Breadboard Half Size

Software apps and online services

Amazon Web Services AWS Lambda

Story

A project fit for younger kids. In this project, an Amazon function reads the weather from openweathermap.com service and displays it in a way suitable for kids, by showing them an outfit rather than an abstract weather condition they are too young to understand.

A wooden box was made from balsa wood as well as the dial, outfits were selected from stock images online printed and cut out and glued on the dial.

A simple Python Lambda function pulls the weather a web service and invokes the servo move every 30 minutes. The lambda function translates the temperature to servo movement based on the following equation

degree=((float(weather['main']['temp'])-10)*180)/40

I chose to keep the coding on the Argon at a minimal with all the calculations taking place in the Lambda function. To schedule it Amazon cloud watch was used to invoke the function every 30 minutes.

import json
import requests

def get_weather():
    url = "https://api.openweathermap.org/data/2.5/weather?q=Riyadh&appid=TOKEN_HERE&units=metric"
    r = requests.get(url)
    return r.json()
 
    
def lambda_handler(event, context):
    weather = get_weather()
 
    print(weather)
    print("***current tempreture***")
    print(weather['main']['temp'])
    
    degree_cat=((float(weather['main']['temp'])-10)*180)/40
    print("***Deg Cat***")
    print(degree_cat)
    
    if degree_cat <10:
        degree_cat=10
    
    
    r = requests.post('https://api.particle.io/v1/devices/e00fce6897f8a208490db287/MoveTo', data = {'access_token':'TOKEN HERE', 'arg': degree_cat}) 
    
 
    return {
        'statusCode': 200,
        'body': json.dumps('Hello from Lambda!')
    }

Servo myservo;  // create servo object to control a servo
                // a maximum of eight servo objects can be created

int pos = 0;    // variable to store the servo position

void setup()
{                                 
  Particle.function("MoveTo", moveServoTO);  

    myservo.attach(D2);   // attach the servo on the D0 pin to the servo object
//    myservo.write(25);    // test the servo by moving it to 25°
    pinMode(D7, OUTPUT);  // set D7 as an output so we can flash the onboard LED
    
     Particle.publish("Setup Module", "STarting", PRIVATE);
}


int moveServoTO(String command)
{   
    myservo.attach(D2); 
    
    int newPos = command.toInt();
    myservo.write(newPos);       
       
    Particle.publish("**Servo Moving TO **"+command, "position:"+ command, PRIVATE);
        
        
    delay(3000);
        
    myservo.detach();

        
        return 1;               // return a status of "1"
    
  //  return 0;
}

void loop()
{
  // empty because we call the gong function via the cloud
}