Description

The ADS1115 are precision analog-to-digital converters (ADCs) with 16 bits of resolution offered in an ultra-small, an MSOP-10 package.
Data are transferred via an I2C-compatible serial interface, four I2C slave addresses can be selected, it operate from a single power supply at 3.3V.
It can be used to detect analog signal and convert it to digital signal.
You can attach a joy stick or other analog sensor such as NTC,temperature, dust sensor and so on.

Features

Parameters Values
Size: 65.0mm x 30.0mm x 18.0mm
Power Supply 3.3v
Analog Input Voltage GND to VDD
PROGRAMMABLE DATA RATE: 8SPS to 860SPS
INTERNAL LOW-DRIFT: VOLTAGE REFERENCE
INTERNAL PGA Available
Resolution 16-bit
I2C™ INTERFACE: Pin-Selectable Addresses
Channels Number 4 SINGLE-ENDED OR 2 DIFFERENTIAL INPUTS
PROGRAMMABLE COMPARATOR 2/3 ~ 16
INTERNAL NTC Support Available

Mechanical Drawing

Ads1115machinical.jpg

Schematic Diagram

AD transformation.jpg

How to wire up

Just Plug into GPIO with this module.

  • NOTE: Please be ware of the No.1 Pin is fit for your GPIO No.1 Pin.
Ads111501.jpg

How to get analog data

  • All steps are available that we’ve consumed that you have already flashed the newest image file into your TF card, and your RaspberryPi is powered on.
  • Modify /boot/config.txt file and add those parameters to enable ADC module’s driver:

sudo vim.tiny /boot/config.txt 

   device_tree=bcm2710-rpi-3-b.dtb
   dtparam=i2c_arm=on
   dtoverlay=ads1015

Save it and reboot your raspberry Pi.

  • Python code to use the ADS1015 and ADS1115 analog to digital converters with a Raspberry Pi or BeagleBone black.
  • To install the library from source (recommended) run the following commands on a Raspberry Pi or other Debian-based OS system:
sudo apt-get install git build-essential python-dev
cd ~
git clone https://github.com/adafruit/Adafruit_Python_ADS1x15.git
cd Adafruit_Python_ADS1x15
sudo python setup.py install
  • Alternatively you can install from pip with:

sudo pip install adafruit-ads1x15

  • Change your work directory to Adafruit_Python_ADS1x15/example as following command:

cd ~/Adafruit_Python_ADS1x15/examples
sudo python simpletest.py

  • You will see a chart like following picture:
Ads1115-result.jpg
  • Do not panic when you see this picture:
Adspic1.jpg
  • Remove the jumper from NTC_EN to AIN0, it will be back to normal.
Adspic2.jpg

Have fun!

Official Documents

  • Datasheet:

File:Ads1115.pdf

FAQ

  • Question: how to detect this module’s address ?
    • Answer: open a terminal and use this command :

i2cdetect -y 1
You will see the address of your ADS1115’s address, by the way, you’d better enable i2c function first.