2020-11-05, 11:38 AM
Thanks for commenting, yes there must be something odd.
Its my backup rpi3+ with I2C: SHT21/HTU21 and 10DOF and GPS(USB) + 820T2 via a powered usb-hub
All sw is up2date and on latest OP. BTW FWIW this sensors were detected correctly under OP1.2
Have checked and reconnected VIN,GND,SCL and SDA - in fact I changed to a different GND pin just to be sure.
When I configure HTU21 on 0x40 (0x40 is the address as per datasheet, I also tried 0x77 - same behavior) thereafter any I2C calls show noticeable delays and the I2C addresses are all blank. Even after rebooting!
I delete HTU21 - refresh - still addresses remain blank.
I then unplug power, wait and rebooting and see again the different addresses.
(screenpnt attached)
Any suggestions other than dump the sensors and get new ones?
Its my backup rpi3+ with I2C: SHT21/HTU21 and 10DOF and GPS(USB) + 820T2 via a powered usb-hub
All sw is up2date and on latest OP. BTW FWIW this sensors were detected correctly under OP1.2
Have checked and reconnected VIN,GND,SCL and SDA - in fact I changed to a different GND pin just to be sure.
When I configure HTU21 on 0x40 (0x40 is the address as per datasheet, I also tried 0x77 - same behavior) thereafter any I2C calls show noticeable delays and the I2C addresses are all blank. Even after rebooting!
I delete HTU21 - refresh - still addresses remain blank.
I then unplug power, wait and rebooting and see again the different addresses.
(screenpnt attached)
Any suggestions other than dump the sensors and get new ones?