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I am using the ADS1015, which is a 12-bit ADC from adafruit. I have it hooked up to a Logic Level Converter using I2C to communicate to the Pi. I have two sensors hooked up to the I2C device, so I need to change the address of the ADS1015 to read from both sensors because they currently have the same address (0x48). I am using the Adafruit ads1x15 python library right now, and I am wondering if there is an easy way to change the I2C address of the ADS1015 in my code.

Here's my code so far:

from smbus import SMBus
import board
import busio
import time

import adafruit_ads1x15.ads1015 as ADS
from adafruit_ads1x15.analog_in import AnalogIn
from adafruit_ads1x15.ads1015 import Mode

i2cbus_1 = SMBus(1)
i2cbus_2 = busio.I2C(board.SCL, board.SDA)

ads = ADS.ADS1015(i2cbus_2)
chan = AnalogIn(ads, ADS.P0)
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Answer

An easy way to set the ADS1015/ADS1115 devices is to hardware pull up/down the four Address pins A0, A1, A2, A3.


ads1115 address pins


See the Q&As in the reference list for more details.


References

(1) Rpi Thonny Python cannot ADS1015/ADS1115 Problem - RpiSE 2019apr16 Viewed 1k times

(2) How can Rpi3/4 interface multiple ADS1015/ADS1115 ADCs? - RpiSE 2019oct12


Appendices

Appendix A - I2cdetect -y 1 two ADS1115s

ads1115 detect


Appendix B - Demo Python Program to red ADS1115 registers


$ ads1015_test16_2019apr1601 tlfong01 2019apr16hkt1506
$ Rpi3B+ stretch linux 4.14.34-v7+ arm python 3.5.3

import smbus

i2cCh0    = smbus.SMBus(1)

def readRegOneByte(i2cCh, devAddr, regAddr):
    readByte = i2cCh.read_byte_data(devAddr, regAddr)
    return readByte

def testReadRegWhoAmI():
    print('\n*** Begin test \n')
    devAddr = 0x48
    regAddr = 0x71
    readByte = readRegOneByte(i2cCh0, 0x48, 0x71)
    print('      devAddr    =', hex(devAddr))
    print('      regAddr    =', hex(regAddr))
    print('      regContent =', hex(readByte))
    print('\n End   test ')
    return

$ Main

testReadRegWhoAmI()

$ End

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