Smart Car Speed Measurement Module Code Disc Count Speed Sensor with Indicator Light

$10.99
  Availability: In Stock
  Shipping: Free Airmail 
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    Handling Time

    Before we can ship your order, we prepare your products, do strict quality-control tests and carefully package the items. The time it takes to prepare your items for shipping is separate from the delivery time. It usually takes 1-3 business days to ship out .

    Shipping Methods

    You can choose the preferred shipping method on the cart page during the checkout process. We offers 3 international shipping methods:

    1. Airmail – Free untracked economy shipping via national postal services (HK Post, Singapore Post, China Post, PostNL, Swiss Post, Sweden Post, USPS, Royal Mail e.t.c.)
    2. Airmail Registered – Tracked shipping via national postal services (HK Post, Singapore Post, China Post, PostNL, Swiss Post, Sweden Post, USPS, Royal Mail e.t.c.)
    3. Expedited Shipping – Express shipping with courier delivery (DHL, UPS, FedEx, TNT)

    Delivery Time

    Airmail and Airmail Registered Area Estimated Delivery Time
    United States, Canada 7-25 business days
    Australia, New Zealand, Singapore, United Arab Emirates 10-25 business days
    United Kingdom, France, Spain, Germany, Netherlands, Japan, Belgium, Denmark, Finland, Ireland, Norway, Portugal, Sweden, Switzerland 10-25 business days
    Italy, Brazil, Russia, South Africa 10-45 business days
    Other countries 10-35 business days
    Expedited Shipping 3-10 business days to Worldwide

    Note: If you choose an expedited shipping, please remember to leave a valid contact number, this is required for expedited shipping’s courier delivery.

  •  Returns & Refund

    Last updated October 05, 2022

    Returns

    If you are not completely satisfied with your purchase for any reason, you may return it to us for a full refund within 15 days from delivery date. All returned items must be in new and unused condition, with all original tags and labels attached.

    Return Process

    To return an item, please email our customer service at sales@alexnld.com to obtain a Return Merchandise Authorization (RMA) number. After receiving a RMA number, place the item securely in its original packaging, and mail your return to the following address:

    Alex NLD
    Attn: Returns
    RMA #
    HaGiborim St 8
    Tiberias, 14388
    Israel

    Please note, you will be responsible for the return shipping charges. We strongly recommend that you use a trackable method to mail your return.

    All customers should contact us and obtain Return Merchandise Authorization (RMA) number before sending anything to us. We will not be responsible for returned item(s) without notifying us in advance.

    Refunds

    After receiving your return and inspecting the condition of your item, we will process your refund to the credit / debit card or PayPal account which was used to place the original order.

    Please allow at least seven (7) days from the receipt of your item to process your refund. Refunds may take 1-2 billing cycles to appear on your credit card statement, depending on your credit card company. We will notify you by email when your refund has been processed.

    Exceptions

    If an item is found damaged or defective on receipt, we kindly ask you to contact us within 15 days from the delivery date to arrange a refund or exchange without physical return of the item.

    Please provide us with following:

    1. Photos of the front and back sides of the packaging box;
    2. A photo, video or screenshot of the defective item or the defective part of the parcel.

    Our customer service team will communicate with you to arrange a refund or reshipment without physical return of the item.

    Warranty & Repair service

    If any of the items you have purchased from us is found defective within 1 year from receipt, you are entitled to a repair under warranty. Please kindly provide us with evidence photos or videos of the defective item. After providing such information to our Customer Service team  and the problem is acknowledged, you can send the items back to us for a repair.

    Note:  Please be aware, we do not cover the cost of the returns fees in  warranty & repair service.

    Order Cancellation

    If you want to cancel an order within 24 hours from confirmation of the payment, you will be entitled to a full refund. It is still possible to cancel an order after 24 hours, provided that it has not yet been shipped. If an order has been shipped, it’s impossible for us to cancel or modify it anymore. If you still want a refund, you required to return the item on it’s arrival.

    Questions

    If you have any questions concerning our return policy, please contact us at:

    +972 054-536-2888
    sales@alexnld.com

     


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Wiring:

1. +5
+5 is the positive input port of the power supply, which can be connected to a voltage of 3.3V~5V
2. GND
GND is the negative input port of the power supply
3. OUT
OUT is the signal output port, which is connected to the I/O port of the MCU, generally connected to an external interrupt
Note: Arduin0 should set the I/O port of MCU to input mode/receive mode, otherwise it cannot be used.
For other MCUs, or more advanced control boards such as Arm, if you want to set the I/O port to input/output mode, you must set it to input mode/receive mode, otherwise it cannot be used.
The 51 series MCU can be used directly without setting the input and output mode.

Programming:
The OUT port of the speed measurement module is connected to the external interrupt port of the MCU, and it is an external buffer whenever an infrared ray is turned on.

Measuring distance:
The output of the speed sensor is a pulse signal, and each pulse is interrupted once; when the infrared ray is turned on, it is a low level, so we set the interrupt as a low-level touch mode. Generally, there are integer grids on the code disc. No matter how many grids there are, the principle is the same. For example, a 10-grid code disc means that there are 10 blank grids. After the motor rotates once, the ray is turned on 10 times, and the external low-level touch method is 10 times. ;
After installing the above ideas, our speed sensor can play an effect. We know that there are 10 interruptions in one circle, so we calculate the number of interruptions, and the total number of times obtained is divided by 10, which is the number of motor rotations, and then according to the wheel Circumference, calculating how long the wheel is in a circle, you can calculate how far the car has run.
Measuring speed:
According to the idea of ​​distance measurement, we use an MCU timer to calculate how many external interrupts are received in 1 second. For example, if 20 external interrupts are received in one second, we can judge that the speed of the car is 1 second. The wheel turns twice, and then Then calculate the circumference of the wheel, and then you can know the speed of the car in 1 second.

Package includes:

1 x Speed Sensor

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