Lutan-Intangible interact

 WEEK 1

The group project I completed with Liyah has been merged into her Notion workspace.

 WEEK 2

Introduction：

PIR stands for Passive Infrared sensor.  "Passive" means it doesn't emit any signals; it simply receives infrared radiation from the environment.

All objects with a temperature above absolute zero emit infrared radiation. The human body, with a temperature of approximately 36-37°C, emits infrared radiation with a wavelength of about 9-10 micrometers. When infrared radiation strikes the crystal inside a PIR sensor, the crystal heats up and undergoes a change in electrical charge.

If a person remains still, the infrared radiation received by the crystal is constant, its temperature will remain constant, and no further charge changes will be generated. Therefore, PIR sensors can only detect moving bodies.

Structure：

White cover：
Typically made of polyethylene or silicone material, it only allows infrared radiation with wavelengths of 7-14 micrometers to pass through (the wavelength range of human body radiation), blocking visible light and other wavelengths.

Fresnel lens system：
The polygonal structure on the outer casing amplifies the changes in radiation levels as a person moves from one area to another.


Four-pin/Six-pin：
Determined by the number of internal crystals. Four-pin devices contain two crystals; six-pin devices contain four crystals.

This is 6-pins

Parameter experiment：

Sensing angle：
Almost the entire front and side, that is, 180 degrees.

Distance threshold：
Approximately 3 meters.

Advantages and disadvantages：
It's very sensitive; even localized movements like hand movements can be detected. The drawbacks are that it must be facing the correct direction and it cannot detect changes in distance, only whether there is human movement.

Applications and ideas：

Burglar alarm

Infrared tracking
In addition, many other household electronic products and interactive devices, such as night lights that automatically turn on at night and devices that are triggered by detecting human movement, use this sensor as a triggering element.


WEEK3



Curiosity Cube：
I plan to create an embodied intelligent robot that can perceive the world environment and uses a Large Language Model (LLM) as its cognitive brain.

It doesn't have any specific application scenarios; it's simply intended as a desktop companion robot. It also serves as a way to verify and integrate the knowledge I've acquired. I've already built the hardware circuitry and designed the overall structure of the code and product. However, there is still a tremendous amount of work to be done.








At the code level, I have currently completed the reading of basic sensor values, TCP data transmission, and the acquisition and storage of raw audio and video data streams, as well as basic face detection. The entire basic perception layer is essentially complete. I will focus on the appearance and structural design, as well as the "decision-implementation" parts that follow the "perception-cognitive" layers. This will be the part where I will primarily apply the knowledge learned in this course.


This is the current hardware circuit design, and it's unlikely to undergo significant modifications in the future. The speaker, servo motors (which are inductive loads), and multiple power-consuming sensors may generate various frequencies of noise, as well as voltage drops or instability issues when operating simultaneously (especially the servo motors; I didn't use a driver board due to size constraints). Therefore, the circuit primarily utilizes filtering circuits composed of small-capacity ceramic and electrolytic capacitors (multi-stage decoupling), as well as large-capacity electrolytic capacitors to stabilize the voltage.

In terms of signal processing, due to the specific characteristics of the I2S digital microphone and the power amplifier module driving the speaker, I mainly employed damping resistors and AC coupling circuits.

In addition, there are self-resetting fuses to protect the servo motors, as well as small surface-mount components for electrostatic discharge and surge protection.




















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