EP-0076

RPI-ADS1115-ADC-Module

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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.

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Features

Parameters	Values
ULTRA-SMALL QFN PACKAGE:	2mm × 1,5mm × 0,4mm
WIDE SUPPLY RANGE:	2.0V to 5.5V
LOW CURRENT CONSUMPTION:	Continuous Mode: Only 150μA Single-Shot Mode: Auto Shut-Down
PROGRAMMABLE DATA RATE:	8SPS to 860SPS
INTERNAL LOW-DRIFT:	VOLTAGE REFERENCE
INTERNAL OSCILLATOR	Available
INTERNAL PGA	Available
I2C™ INTERFACE:	Pin-Selectable Addresses
FOUR SINGLE-ENDED OR TWO DIFFERENTIAL INPUTS	ADS1115
PROGRAMMABLE COMPARATOR	ADS1115

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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.

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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

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

cd ~/Adafruit_Python_ADS1x15/examples
sudo python simpletest.py

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• You will see a chart like following picture:
  

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• Do not panic when you see this picture:
  

• Remove the jumper from NTC_EN to AIN0, it will be back to normal.
  

Have fun!

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Official Documents

• Datasheet:

File:Ads1113.pdf

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FAQ

• Question:
  • Answer:

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