How to Make a Simple Little Lamp
In life, sometimes there will be no electricity. At this time, if there is a small electric light, it will be much more convenient. Today, I will tell you how to make a simple small electric light.
Make an automatic sensor door
Sonar:bit is a 3-wire ultrasonic module with the working voltage between 3-5V. It is available to be used to 3.3V or 5V micro-controller system. With only one 3-wire(GVS) cable, it can work properly. Compared to the normal 4-wire ultrasonic module, it has saved one IO port. The measurement range of sonar:bit is 4cm-400cm. It can output stable and accurate measurement data with ±1cm tolerance only.
The Energy Conservation Fan
A fan is very helpful in this hot summer, I’ve built an energy conservation fan which would work when I sit down and stop when I leave from my seat.