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I'm trying to learn reading out I2C chips, but somehow I can't figure out how to find the right data addresses.

I bought a water level sensor and a ADS1015 ADC[foto below]. They are connected via I2C to the RPI. The RPI seems to be configured correctly, as i2cdetect -y 1 shows that an I2C chip is present at 0x48. The water sensor LED lights up so it has power. I expect the chip to have more than 1 value, and should therefore supply i2cget with the address:

i2cget -y 1 0x48 address

It should be in the datasheet, but I don't get where it tells me the address. I tried looping over all addresses, some give an error, some a value (128, 133, 0, ...).

How do I figure out where the voltage is stored on the I2C chip?

Also, the ADS1015 has 4 channels, are these combined in one I2C chip, or should i2cdetect list 4 channels?

Thanks!

wiring

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    That doesn't seem to be an easy chip to work with. Trial and error seems your best bet but using the Quick Start as a guide (page 8 of the PDF). I would google for the chip name followed by a programming language of your choice. Then look through the code to see how the chip is configured and read.
    – joan
    Commented Aug 3, 2018 at 17:07
  • The Adafruit tests help to see that the configuration does work, so that's nice.
    – DA--
    Commented Aug 4, 2018 at 14:49

2 Answers 2

Reset to default
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read http://www.ti.com/lit/ds/symlink/ads1015-q1.pdf

paragraph 8.5.1.1 for I2C addressing

perhaps this datasheet will also answer your other question

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Yes, as advised by Jan Hans, the use of the ADDR pin is clever.

enter image description here

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