lopuh@void:~/projects/light_rate$

// photosensor data acquisition system

$ stat project.info
Name: light_rate
Link: L0puh/light_rate
Type: embedded data acquisition
Hardware: Arduino UNO
Status: "completed"
Sensors: "5516 photoresistor"

$ ls -la media/

Light Intensity Plot
plot.png [333px]
Light Rate Demo
video.gif [450px]

$ cat overview.txt

// Project Description
This project uses a photosensor to measure the analog
intensity of light and calculates the rate of change
of light intensity over time. Real-time visualization
on LCD display with Python data logging and plotting.

$ cat hardware.txt

// Technology Stack
- arduino uno
- LCD screen (1602A)
- 5516 photoresistor
- I2C Converter
- python with:
    * matplotlib
    * pyserial
- arduino library:
    * LiquidCrystal_I2C

$ ls -la schematics/

Circuit Diagram
circuit.png [schematic diagram]

$ ./run.sh

# How to Run
## 1. Assemble the circuit
$ # Connect components according to schematic

## 2. Install LiquidCrystal library
$ arduino-cli lib install "LiquidCrystal I2C"

## 3. Connect Arduino
$ ls /dev/ttyUSB*
/dev/ttyUSB0 # typically on Linux

## 4. Run the system
$ ./run.sh
# [INFO] Uploading to Arduino...
# [INFO] Starting Python visualization...
# [INFO] Reading sensor data...
# [INFO] Generating plot...

$ cat sensor_specs.txt

// Photoresistor 5516 Specifications
Type: Cadmium Sulfide (CdS) photocell
Resistance Range: 10KΩ - 1MΩ
Spectral Peak: 540nm (green)
Response Time: ~75ms (rise), ~150ms (fall)
Operating Temp: -30°C to +70°C
Analog Pin: A0 (Arduino UNO)
Arduino
Python
Matplotlib
PySerial
LCD
Sensor
I2C
DAQ