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This kit is amazing for the price. It includes a large variety of high quality electrical components. I was impressed with the contents. There are components for building logic relays, timers, sensors, digital displays, etc. Input devices include a key pad, remote control, and a joystick. The components alone are worth more than the cost of the kit. That said, be prepared to do your homework. There is no documentation in the kit, and the Arduino website, while a vast resource of information, can be difficult to navigate. The centerpiece of the kit is the UNO board. I recommend buying a case, https://www.allelectronics.com/index.php?page=seek&id%5Bm%5D=pattern&id%5Bq%5D=uno+case.
The UNO is programmed through an Arduino app. You can access the app online, but I chose to download it to my laptop. The app installation was straightforward and I had it running in no time. The app has well-documented coding examples stored in a library. They can be modified, compiled and loaded to the UNO through a USB. In one day, I was able to program the UNO to blink an LED a different rates, blink a series of LEDs in order, detect a push button closure, and screen print the relative position of a potentiometer on a scale of 0 to 1023 (0=off and 1023=5 vdc).
The Arduino website: https://www.arduino.cc/en/Tutorial/BuiltInExamples is invaluable for setting up and understanding the examples in the app. Five stars for price and variety of contents of this kit, but four stars for lack of any documentation.
No web link or paper documentation accompanied the package I received from All Electronics, but it looks like the contents are identical to the Elegoo package described at https://tinyurl.com/rxc9ktl and offered at a much higher price. So I went to that page and downloaded their documentation from https://tinyurl.com/vo4gv2a
