In a hurry I mistakenly connected the VCC of the Bmp280 to ground and the ground of the Bmp280 to 5V.
Afterwards, I checked the i2c-bus with another sensor but
i2cdetect -y 1 only reported
Q How can I determine with simple means (no oscilloscope) what I bricked? Bmp280-sensor, i2c-bus on rPi, both, what else?