Connecting multiple voltage sensors with the STM32 Nucleo board
As per my knowledge, you cannot have same address for all the slaves on I2C bus especially if you want to read them one by one.
If you want to do so, i suggest that you have an i2C multiplexer something like this as well in your circuitry.
Using it is fairly straight-forward: the multiplexer itself is on I2C address 0x70 (but can be adjusted from 0x70 to 0x77) and you simply write a single byte with the desired multiplexed output number to that port, and bam - any future I2C packets will get sent to that port. In theory, you could have 8 of these multiplexers on each of 0x70-0x77 addresses in order to control 64 of the same-I2C-addressed-part.