KY-053 Analog Digital Converter

The analog-to-digital converter (ADC) makes it possible to measure analog voltage values on up to 4 inputs with high precision. Corresponding commands can be sent via the I2C bus to carry out these measurements. The measured values are then coded and output to the I2C bus.

With a resolution of up to 16 bits, very precise measurements can be carried out. The ADC can program different sampling rates, which makes it flexible for different applications. It operates in a voltage range from 2 V to 5.5 V and can measure input voltages up to the operating voltage.

Easy integration via the I2C interface and the ability to use multiple ADC channels make this converter ideal for projects that require precise voltage measurements. Applications could include data acquisition, sensor monitoring or various electronics projects where accurate analog measurements are required. The low operating current of typically 150μA also makes it suitable for energy-efficient applications.

A corresponding library is required for this module - see code examples below.

Changing the I2C address

This analog to digital converter (or in short ADC) has not only one I2C address. This is an ADC which can have 4 different I2C addresses. These can be chosen freely but in the further course the standard address 0x48 is used.

In the following table you can see all possible addresses and how they can be reached. Here is mainly to note that the ADDR pin of the ADC is responsible for the change of the address.

Pin assignment

The pin assignment is printed on the module board

Code example

Unlike the Arduino, the Raspberry Pi has neither analog inputs nor an integrated analog-digital converter. This limits the Raspberry Pi when using analog sensors. To still use analog sensors on the Raspberry Pi, the Raspberry Pi can be extended by 4 ADC channels with 16-bit accuracy with our KY-053 Analog Digital Converter Module.

The program uses the corresponding ADS1x15 and I2C Python libraries from Adafruit to control the ADS1115 ADC. These were found under the following link https://github.com/adafruit/Adafruit_CircuitPython_ADS1x15 under the MIT license released. The required libraries are ** not ** included in the download package below.

First you need to enable I2C on your Raspberry Pi. To open the configuration, enter the following command:

sudo raspi-config

Select 3 Interface Options → I4 I2C and activate the I2C interface. You have now successfully activated I2C. The analog-to-digital converter can now be reached under the I2C address 0x48, which is set by default for this sensor. The I2C address will be different if you have already configured it before configuring your Raspberry Pi.

Now install pip3 with the following command:

sudo apt-get install python3-pip

The next step is to set up the virtual environment. To do this, enter the following commands:

mkdir dein_projekt
cd dein_projekt
python -m venv --system-site-packages env
source env/bin/activate

Use the following commands to download and install the adafruit-circuitpython-ads1x15 library.

pip3 install adafruit-circuitpython-ads1x15

After you have downloaded the library, you only need to enter the following command...

nano ADS1115.py

... to create a new file on your Raspberry Pi and then copy the following code into the file you have just created.

import time
import board
import busio
import adafruit_ads1x15.ads1115 as ADS
from adafruit_ads1x15.analog_in import AnalogIn

# Create the I2C bus
i2c = busio.I2C (board.SCL, board.SDA)

# Create the ADC object using the I2C bus
ads = ADS.ADS1115 (i2c)

# Create single-ended input on channels
chan0 = AnalogIn (ads, ADS.P0)
chan1 = AnalogIn (ads, ADS.P1)
chan2 = AnalogIn (ads, ADS.P2)
chan3 = AnalogIn (ads, ADS.P3)



while True:
    print ("channel 0:", "{:> 5} \ t {:> 5.3f}". format (chan0.value, chan0.voltage))
    print ("channel 1:", "{:> 5} \ t {:> 5.3f}". format (chan1.value, chan1.voltage))
    print ("channel 2:", "{:> 5} \ t {:> 5.3f}". format (chan2.value, chan2.voltage))
    print ("channel 3:", "{:> 5} \ t {:> 5.3f}". format (chan3.value, chan3.voltage))
    print ("----------------------------------------------- ---- ")
    time.sleep (1)

You can then start this with the following command:

python3 KY053.py