Complications: Wires breaking, LEDs not working, missteps on circuit building (wrong connections); was able to upload to Arduino IDE, but the LED would not blink.
Next time: try to fix the blinking problem by tweaking wires and components, or replacing LEDs on breadboard (use multimeter to see if attiny is working).
2/26/2025
* Attempted to fix bare arduino circuit by replacing microcontroller twice
* Used BME 280 sensor to see if it was flowing through.