limited offer US $3.78 School Line Following Smart Toy Car Electronics Soldering Project Kids Competition Tracking Kit Rob

School Line Following Smart Toy Car Electronics Soldering Project Kids Competition Tracking Kit Rob

[4000333259043] Description: 100% Brand New and High Quality. 1. Design your runway. You can also design a complex runway using 15-20mm black electrical tape directly on the ground. 2. Easy to assemble. We provide you with an electronic brochure. Assembly is easier and great for kids, beginners and amateurs. 3. Wide range of applications. It's popular to help children understand welding project knowledge like mechanical structure, electronic basic technology, and sensor principle. 4. Working principle: LM393 compares the size of two photo-resistors at any time. When there is imbalance, control one side of the motor to stop and the other side accelerates and rotate, so that the car can be corrected in direction and restored to the correct direction. Specification: Material: plastic Color: multi-color working principle: after the successful installation, the car can travel along a black track with a width of about 15mm. LM393 compares the size of two photo-resistors at any time. When there is imbalance, control one side of the motor to stop and the other side accelerates and rotate, so that the car can be corrected in direction and restored to the correct direction. The whole process is a closed-loop control. Therefore, it can be quickly and sensitively controlled. Package Included: 1PC * Smart tracking car kit Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2cm differences due to manual measurement. Note: 1.Due to the difference between different monitors,the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures,,but not the same performance on different bodies as on the model. 2.Compare the detail sizes with yours,please allow 2-4cm differs due to manual measurement for the clothes, thanks All measurement in cm and please note 1cm=0.39inch 1) We accept Alipay, West Union, TT.All major credit cards are accepted through secure payment processor ESCROW. 2 If you can't checkout immediately after auction close, please wait for a few minutes and retry Payments must be completed within 3 days. 1) WORLDWIDE SHIPPING. (Except some countries and APO/FPO) DHL UPS TNT FEDEX takes 3-7 days ,EMS takes 8-12 days.Post air mail need 2-8 weeks.But all of them are dependent on the country delivered to. 2) SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit times may vary, particularly during the holiday season. 1) Buyer's early confirmation will be highly appreciated after receiving the items. 2) Since your feedback is very important to our business's development, we sincerely invite you to leave positive feedback for us if you are satisfied with our product and service. 3) Please contact us before leaving any negative or neutral feedback. We will work with you to solve any problems.Thank you for your understanding!