{"id":528,"date":"2022-01-14T16:21:53","date_gmt":"2022-01-14T16:21:53","guid":{"rendered":"https:\/\/andrejacobs.org\/?p=528"},"modified":"2022-04-11T20:22:59","modified_gmt":"2022-04-11T20:22:59","slug":"converting-analog-to-digital-using-the-adafruit-ads1015-breakout","status":"publish","type":"post","link":"https:\/\/andrejacobs.org\/electronics\/converting-analog-to-digital-using-the-adafruit-ads1015-breakout\/","title":{"rendered":"Converting analog to digital using the Adafruit ADS1015 breakout"},"content":{"rendered":"\n<p class=\"has-small-font-size\">Image by <a href=\"https:\/\/www.adafruit.com\/product\/1083\" target=\"_blank\" rel=\"noreferrer noopener\">Adafruit<\/a><\/p>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><h2>Overview<\/h2>\n<p>The ADS1015 can convert up to 4 analog signals to 12bit digital precision. The Raspberry Pi doesn\u2019t have a built in ADC and thus a module like this comes in very handy.<\/p>\n<p>I will be following\u00a0<a href=\"https:\/\/learn.adafruit.com\/adafruit-4-channel-adc-breakouts\/overview\">Adafruit\u2019s guide<\/a>\u00a0on how to use the ADS1015 breakout board.<\/p>\n<h2>Soldering on the headers<\/h2>\n<p>I will be using the ADS1015 in a project and not on a breadboard, thus I will be soldering the headers to point out to the top (like a Raspberry Pi\u2019s GPIO).<\/p>\n<p>I placed the headers inside of a breadboard with the longer leads going into the breadboard.<\/p>\n<p>Then placed the ADS1015 on top of the headers and soldered them in place.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/andrejacobs.org\/wp-content\/uploads\/2022\/01\/ads_1401.png\" alt=\"\"><\/p>\n<h2>Building a simple voltage divider<\/h2>\n<p>To do the initial testing of the module I will be using a simple voltage divider that runs of the 3.3V line of the Adafruit MCP2221A.<\/p>\n<p>I have covered how I use the very handy little Adafruit MCP2221A before on <a href=\"https:\/\/andrejacobs.org\/electronics\/talk-to-i2c-devices-directly-from-a-mac-using-the-adafruit-mcp2221a-breakout\/\">this post<\/a> and will be using this module again for communicating to the ADS1015 using I2C.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/andrejacobs.org\/wp-content\/uploads\/2022\/01\/ads_1402.png\" alt=\"\"><\/p>\n<p>Before moving onto installing the software and testing the ADS1015 I decided to dial in the divider to read +\/- 1V at the point where I will be hooking up the A0 port.<\/p>\n<p>NOTE: I tried powering the ADS1015 via the 5V line from the MCP2221A but then Blinka couldn\u2019t detect the MCP2221A module. Connecting it to the 3.3V line seems to solve the issue.<\/p>\n<h2>Setting up the software<\/h2>\n<p>Please see\u00a0<a href=\"https:\/\/andrejacobs.org\/electronics\/talk-to-i2c-devices-directly-from-a-mac-using-the-adafruit-mcp2221a-breakout\/\">my post about the Adafruit MCP2221A breakout<\/a>\u00a0for how I setup Python projects like these on my Mac.<\/p>\n<p>My git repo for this module can be\u00a0<a href=\"https:\/\/github.com\/andrejacobs\/electronic-modules\/tree\/main\/adafruit\/ads1015\">found here<\/a>.<\/p>\n<ul>\n<li>Setup a Python virtual environment and install the required pip dependencies for the MCP2221A.<\/li>\n<\/ul>\n<pre><code>$ .\/new-project.sh\n\n# I then copied the requirements.txt from my mcp2221a directory\n$ .\/install-requirements.sh\n<\/code><\/pre>\n<ul>\n<li>Connected the MCP2221A to the ADS1015:\n<ul>\n<li>5V \u2192 VDD (White)<\/li>\n<li>GND \u2192 GND (Black)<\/li>\n<li>SCL \u2192 SCL (Grey)<\/li>\n<li>SDA \u2192 SDA (Purple)<\/li>\n<\/ul>\n<\/li>\n<li>Time to scan for the I2C address. Connected the MCP2221A to my Mac using the USB-C cable and ran the following.<\/li>\n<\/ul>\n<pre><code class=\"language-bash\"># Active the venv and export the required environment variable for Blinka\n$ source source.sh\n(venv)$ cd examples\n(venv)$ python3 i2c-scan.py\n\nI2C addresses found: ['0x48']\n<\/code><\/pre>\n<ul>\n<li>Install the CircuitPython library for the ADS1015.<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">(venv)$ pip3 install adafruit-circuitpython-ads1x15\n(venv)$ .\/update-requirements.sh\n<\/code><\/pre>\n<ul>\n<li>Test that the Python libraries will work.<\/li>\n<\/ul>\n<pre><code class=\"language-bash\">(venv)$ python\n&gt;&gt;&gt; import adafruit_ads1x15.ads1015 as ADS\n&gt;&gt;&gt; from adafruit_ads1x15.analog_in import AnalogIn\n<\/code><\/pre>\n<ul>\n<li>Ok so here I hit a snag . There is an issue with importing the Blinka library where you will get the following error.<\/li>\n<\/ul>\n<pre><code class=\"language-python\">NotImplementedError: ('Microcontroller not supported:', 'MCP2221')\n<\/code><\/pre>\n<ul>\n<li>I raised a PR for the Blinka library to <a href=\"https:\/\/github.com\/adafruit\/Adafruit_Blinka\/pull\/541\">fix the issue<\/a>.<\/li>\n<\/ul>\n<h2>Converting analog signal to digital value<\/h2>\n<ul>\n<li>Connect the A0 pin from the ADS1015 to the voltage divider point as marked in the schematic.<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/andrejacobs.org\/wp-content\/uploads\/2022\/01\/ads_1403.png\" alt=\"\"><\/p>\n<ul>\n<li>Create a file named <code>adc.py<\/code>. Note: I copied the source code from <a href=\"https:\/\/github.com\/adafruit\/Adafruit_CircuitPython_ADS1x15\">here<\/a>.<\/li>\n<\/ul>\n<pre><code class=\"language-python\">import time\nimport board\nimport busio\nimport adafruit_ads1x15.ads1015 as ADS\nfrom adafruit_ads1x15.analog_in import AnalogIn\n\n# Create the I2C bus\ni2c = busio.I2C(board.SCL, board.SDA)\n\n# Create the ADC object using the I2C bus\nads = ADS.ADS1015(i2c)\n\n# Create single-ended input on channel 0\nchan = AnalogIn(ads, ADS.P0)\n\nprint(&quot;{:&gt;5}\\t{:&gt;5}&quot;.format('raw', 'v'))\n\nwhile True:\n    print(&quot;{:&gt;5}\\t{:&gt;5.3f}&quot;.format(chan.value, chan.voltage))\n    time.sleep(0.5)\n<\/code><\/pre>\n<ul>\n<li>Ensure the circuit is connected to the computer and run the following. Adjust the potentiometer while measuring.<\/li>\n<\/ul>\n<pre><code class=\"language-python\">(venv)$ python adc.py\nraw\t    v\n 9488\t1.186\n 9440\t1.180\n 9472\t1.184\n 9472\t1.184\n 9472\t1.184\n 8128\t0.906\n 1744\t0.212\n 1232\t0.152\n 1200\t0.158\n26336\t3.294\n26352\t3.294\n<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Image by Adafruit [&#8230;]<\/p>\n<p><a class=\"understrap-read-more-link\" href=\"https:\/\/andrejacobs.org\/electronics\/converting-analog-to-digital-using-the-adafruit-ads1015-breakout\/\">Read more &rarr;<\/a><\/p>\n","protected":false},"author":2,"featured_media":529,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[6],"tags":[23],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.13 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Converting analog to digital using the Adafruit ADS1015 breakout - 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