laravel-sensors/app/Models/Reading.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Reading extends Model
{
    use HasFactory;
    
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'type',
        'value',
    ];

    public function sensor()
    {
        return $this->belongsTo('App\Models\Sensor');
    }
}