The project contains 3 items:

1 ESP32 Devkit - https://amzn.to/4mJzOYi

1 IR Flame Sensor Module - https://amzn.to/4lxRSUl

1 Passive Piezo Buzzer Module (requires PWM) - https://amzn.to/45ZOEUU

I've connected the Signal of the piezo to GPIO 22, the DO of the flame sensor to GPIO 23. Both units are powered by 3.3v