Since I started tossing Arduino, I have nothing to do. I just saw a measuring tool competition next door. That's right!

Have you ever seen a Saber ruler?

Come and get one of these, and then shock base friends for a whole year ~!

• No need for multicolor printing
• with gun grip
• acoustic compensation algorithm to make the measurement more accurate
• there are three functions: can measure the ambient temperature/humidity/distance
• USB port power supply, you can plug in a USB port or simply plug in the phone can also start

• still a rock cosmic element, see:

  

• I need a Arduino NANO V3 with a 0.91-inch OLED screen, which looks like the following figure (in theory, all shopping platforms should be sold. I just brushed it on a lot of shopping platforms. I call it "geek core movement". I really can't buy it. I can go to this house to ask. In addition, the six pins at the burning port are unnecessary. ha ~ if you buy a welded pin, you can remove or cut it off.):

  

• need a SR-04 ultrasonic ranging module (support 1-400cm range ranging, theoretical accuracy ± 1mm)
• need a DHT22 high-precision temperature and humidity module (-40~80 ℃ measuring temperature, 0~100% measuring humidity)
• requires a touch switch
• you need to Arduino IDE for program burning (the relevant code is ready for you, see "Document 1-Code Part" for details)
• need some DuPont wires (wiring scheme is also ready for you, see "Document 2-Wiring Scheme" for details)