University of Pennsylvania, ESE 5190: Intro to Embedded Systems, Lab 1
Sugata Sen, Harish Ramesh
https://www.linkedin.com/in/sugata-sen/ ; https://www.linkedin.com/in/harishramesh1998/
Tested on: ASUS ROG GL-552 VW, Windows-10 ; Lenovo Legion Slim-7, Windows-11
The ADPS9960 sensor receives input from user via various stimuli. In our implementation we have taken advantage of its proximity sensor and its ability to detect colour. The RP2040 was programmed to detect the following and react accordingly:
- Upon startup, the message 'waiting to type', will appear on the serial output/terminal.
- In the case of an upward motion, print the letter 'a'.
- In the case of a motion towards the right, the letter 'b'.
- In the case of a downward motion, the letter 'c'.
- In the case of a motion to the left, the letter 'd'.
- In the case of red light, to enable a backspace.
- In the case of a blue light, to break and exit the program.
The color sensor of ADPS9960 is initially set to integration time of apds.color_integration_time=256, which is too slow of a response for the purpose of a firefly follower, so we set it to apds.color_integration_time=1 to make the color sensor react as fast as possible to the external light source.
Now, we simply scale the cumulative/brightness data from sensor, and scale it for visibility before using it to modulate the brightness of the on-chip LED of the RP2040. We have chosen the Red colour to output, but any combination of colours can be chosen as long as their brightnesses are proportional to "c". Where "c" is the brightness/luminosity data of the APDS9960 color sensor.
Reacts accordingly when shown to the youtube video of a firefly:
- Upon sensing a bright flash , LED gets brighter
- Upon sensing less light, LED gets dimmer
