Posture Control Night Light with Change Color and Count Down

Recently, my sleep was not very good. When I wake up and turn off the lamp, it will relieve my fatigue. Of course, it make me exciting and can not sleep. therefore,I need some way to resolve this problem. I went to the Internet to browse and finally got a great idea.I am going to make a posture lamp that can be turned off regularly, because then I can turn off the lamp without any action.

In order to avoid limitations，So you also need to design a function that turns off the lamp immediately without relying on timing. But, I don't think the function is enough. I am going to design a control that is similar to a mobile phone shake. Of course, the function I envisioned is just to change the color of the lamp by shaking the lamp. In order to make the appearance simple, I am ready to control the timing and switching function of the lamp without using the button, and directly use the sensing method to control. For example, I want to time 5 minutes. Then I rotate the lamp 90° clockwise with the contact point of the table and the lamp as the origin. If I want to turn off the lamp,then I rotate the lamp 180° clockwise with the contact point of the table and the lamp as the origin. Of course, It is very easy to change color. You just need to shake lamp.

Hardware Composition

Seeeduino Nano

controller select Seeeduino Nano. Because it is very cheap and small. Of Course, For easy connections, the Grove Shield for Arduino Nano is also a good choice.

Grove - 3-Axis Digital Accelerometer ±200g (ADXL372)

Grove - 3-Axis Digital Accelerometer ±200g (ADXL372)is a ultra low power digital output MEMS Accelerometer, it can provide a 12-bit output at 100 mg/LSB scale factor. The most notable feature of this sensor is its ultra-low power consumption(only 22μA in measurement mode) and large measurement range(±200g). All the data output via the Grove I2C port, the I2C address is changeable. In order to meet a wider range of measurement needs, the sampling rate can be selected from 400Hz/800Hz/1600Hz/3200Hz/6400Hz, and the bandwidth can be selected from 200Hz/400Hz/800Hz/1600Hz/3200Hz. In addition to being used as an acceleration measurement, you can also use this module to do impact and shock detection。So,It is suitable for this project.

Grove - RGB LED Ring (20 - WS2813 Mini)

In order to achieve good lighting efficiency, The Grove - RGB LED Ring (20 - WS2813 Mini) is good choice, Because each LED has a constant current driver, the color will be very consistent even if the voltage changes. This will make the lighting effect very suitable.

Li-Po Rider

Seeeduino Nano support 5v, However, in order to make the lamp easy to carry, it is obviously not a suitable choice to always use the computer USB power supply.we use Li-po Rider to solve this problem.

Software Design

Grove - 3-Axis Digital Accelerometer ±200g (ADXL372)

Grove - 3-Axis Digital Accelerometer ±200g have two reads and write mode,the one is normal reads and write mode ,the other one is FIFO reads and write mode. Thank for Seeed's wiki, Because it is a perfect library file inside, it saves me a lot of time to develop this small design. Finally I chose the fifo mode to output a set of data and then average it.

 uint16_t samples = acc.samples_in_fifo();
  // To ensure that data is not overwritten and stored out of order,
  // at least one sample set must be left in the FIFO after every read
  if (samples > 12) {
    samples = (samples > BUFFER_SIZE)? BUFFER_SIZE : (samples / 6 - 1) * 6;
    acc.fifo_read(buffer, samples);
    for (j=0; j<samples; j+=6) {
      // convert raw data
      xyz_t *xyz = acc.format(buffer + j);
      xyz_acc.x = xyz->x + xyz_acc.x;
      xyz_acc.y = xyz->y + xyz_acc.y;
      xyz_acc.z = xyz->z + xyz_acc.z;
    }
     xyz_acc.x = xyz_acc.x * 6.0 / j;
     xyz_acc.y = xyz_acc.y * 6.0 / j;
     xyz_acc.z = xyz_acc.z * 6.0 / j;

Grove - RGB LED Ring (20 - WS2813 Mini)

About Grove - RGB LED Ring (20 - WS2813 Mini) I just wrote a control function, the code called in the control function I refer to wiki content, this is the code of the control function I wrote.

void Led_Control(uint32_t Led_num,uint32_t Color,bool Switch)
{
    for(int i=0; i<Led_num; i++)
    {
      if(Switch)
      {
        strip.setPixelColor(i, Color);
        strip.show();
      }  
      else
      {
        strip.setPixelColor(i, Off_All);
        strip.show();
      }
    }
}

Show Results

In the end, after half a day, I built the overall hardware connection. The connections of the hardware are as follows.

We used a 3D printer to print the case. The lampshade is a green shell, the base is red.

Here is the video!