4-Channel 16-Bit ADC for Raspberry Pi (ADS1115)

The analog-to-digital converter is a popular accessory for Raspberry Pi. This 4-channel converter is based on the ADS1115 from Texas Instrument, which is a precision, energy-saving 16-bit ADC chip. The sensor fits the size of the Raspberry Pi Zero and has an integrated analogue Grove connector so you can also use the analogue Grove modules with it.

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Properties

  • LOW power consumption:
    • Continuous mode: only 150μA
    • Single-shot mode: automatic shutdown
  • Wide range of supply voltage
  • Input multiplexer (MUX), which provides two differential inputs or four single inputs
  • Programmable comparator
  • Internal low-drift reference voltage
  • Internal oscillator
  • Internal PGA
  • Programmable data rate: 8SPS is 860SPS
  • I2C compatible serial interface

Specifications

FeatureValue
Supply voltage 3.3 V / 5 V
Analog input intensity 100mA (temporary)
10mA (continuous)
Storage temperature -60～150℃
Maximum joint temperature 150℃
Interface I2C
I2C address 0x48(default)
0x49~0x4B (configurable)
Dimensions 65 x 30 x 20 mm
Weight 36.5 g
Packaging dimensions 140 x 78 x 27 mm
Gross weight 37 g

This grove has 4 possible I2C addresses, from 0x48 to 0x4B. The default I2C is 0x48. You can change the I2C address by soldering.

Note

If the SDA (corresponding 0x4A address) is used as a device address, keep the SDA low on the SDA line for at least 100 ns after switching to a low SCL state to ensure that the device decodes the address correctly during I2C communication.

Typical applications

  • Portable instrumentation
  • Consumer goods
  • Battery monitoring
  • Temperature measurement
  • Industrial automation and process control

Equipment overview

Exit timetable

How to get started

Equipment

Required materials

Raspberry Pi

Analogue-to-digital converter for Raspberry Pi

4-channel 16-bit (ADS1115)

Software

In this section you will learn how to install the driver and how to enable the I2C bus.

Enable I2C because I2C is disabled by default, you must configure it manually.

  • Step 1: Connect power to Raspberry Pi.
  • Step 2. open the raspi-config by entering the following command in the terminal.

    sudo raspi-config

    • Step 3: Go down to "5 interfacing options" and press "enter" to select.

    • Step 4. go down to "P5 I2C" and press "enter" to select.

    • Step 4. select "Yes" to enable.

    • Step 5. select "Ok".

    • Step 6 Choose "Finish" to save your changes.

    Installation

    Note

    Follow the instructions during installation, otherwise the installation may fail or even damage the module.

    • Step 1: Connect the power supply to the Raspberry Pi.
    • Step 2. Open the terminal and enter the following command.

    git clone https://github.com/Seeed-Studio/pi-hats.git
cd pi-hats
sudo ./install.sh -u adc_ads1115

    • Step 3: Disconnect the power from Raspberry Pi.
    • Step 4: Insert the cap into the Raspberry Pi
    • Step 5: Connect the power supply to Raspberry Pi.

    Displaying the installation status

     .../install.sh -l

    Success

    If the installation was successful, you should see the following message.

    		 

    pi@raspberrypi:~/pi-hats $ ./install.sh -l
adc_ads1115 : installed
rtc_ds1307 : not installed
rtc_ds3231 : not installed

    Uninstalling

    Sudo ./install.sh -u

    ADC operating guide

    0-3 channels are differential voltage, full scale range -2.048V - +2.048V

    channels 4-7 is absolute voltage AIN0-AIN3, full scale range 0 - +2.048V

    Read AIN0(channel 4) voltage (unit: mV).

        cat /sys/devices/platform/soc/*04000.i2c/i2c-1/1-0048/in4_input

    EntryChannel/...XXX
    AIN0 4 in4_input
    AIN1 5 in5_input
    AIN2 6 in6_input
    AIN3 7 in7_input

    Read all channels at once.

        ./ads1115.sh

    Let's use the example Grove- Sound Sensor. If you use a grove cable to connect a sound sensor with ADC overlay as shown below, it means you are using A0 (fourth channel). Now run the ++ command. / Ads1115.s ++ inside the terminal, you will see the following message if the sound sensor data is read.

    pi@raspberrypi:~/pi-hats $ ./ads1115.sh
3f804000.i2c
four channels' value are :
1024
,
285
,
285
,
285
four channels' value are :
796
,
285
,
285
,
285
four channels' value are :
304
,
286
,
283
,
283
four channels' value are :
366
,
284
,
284
,
283
^Pippercuttering: ~/pi-hats $

    Success

    You will notice that channels 5, 6, 7 are more or less constant, while channel 4 reads only some data.


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