Measuring a Solar Eclipse with an LDR

This data logging project uses a Light Dependent Resistor (LDR) configured as part of a voltage divider circuit to monitor changes in ambient light intensity. As the moon passes in front of the sun during a solar eclipse, the ambient sunlight decreases, causing the resistance of the LDR to increase. This shifts the output voltage of the voltage divider circuit. An ATtiny85 microcontroller measures this analog voltage change and processes the light level data. Because environmental conditions during an eclipse involve more than just light, additional I2C sensors are integrated into the system to simultaneously track temperature, humidity, and barometric pressure. The ATtiny85 coordinates communication and data collection, passing the sensor readings along. An M5Stack Cardputer serves as the primary interface and logging unit, capturing the incoming sensor data and saving it onto an SD card for later analysis. Power is managed across the circuit components using standard breadboards and jumper wires, while an Arduino Uno is utilized during the setup phase specifically to program the ATtiny85 microcontroller before deployment in the field.