It's easy to use the ADS7830 with Python or CircuitPython, and the Adafruit_CircuitPython_ADS7830 module. This module allows you to easily write Python code to read the 8 analog inputs on the ADC.

You can use this driver with any CircuitPython microcontroller board or with a computer that has GPIO and Python thanks to Adafruit_Blinka, our CircuitPython-for-Python compatibility library.

CircuitPython Microcontroller Wiring

First wire up the breakout to your board exactly as follows. The following is the breakout wired to a Feather RP2040 using the STEMMA connector along with a potentiometer connected to analog input 0 (A0):

  • Board STEMMA 3V to breakout VIN (red wire)
  • Board STEMMA GND to breakout GND (black wire)
  • Board STEMMA SCL to breakout SCL (yellow wire)
  • Board STEMMA SDA to breakout SDA (blue wire)
  • Breakout VIN to potentiometer positive (red wire)
  • Breakout A0 to potentiometer wiper (green wire)
  • Breakout GND to potentiometer negative (black wire)
Video of a white hand turning the knob on a STEMMA Wired Potentiometer Breakout Board connect to a breadboard. Color changes when the knob is twisted.
For the easiest way possible to measure twists, turn to this STEMMA potentiometer breakout (ha!). This plug-n-play pot comes with a JST-PH 2mm connector and a matching  

The following is the breakout wired to a Feather RP2040 using a solderless breadboard:

  • Board 3V to breakout VIN (red wire)
  • Board GND to breakout GND (black wire)
  • Board SCL to breakout SCL (yellow wire)
  • Board SDA to breakout SDA (blue wire)
  • Breakout VIN to potentiometer positive (red wire)
  • Breakout A0 to potentiometer wiper (green wire)
  • Breakout GND to potentiometer negative (black wire)

Python Computer Wiring

Since there are dozens of Linux computers/boards you can use, we will show wiring for Raspberry Pi. For other platforms, please visit the guide for CircuitPython on Linux to see whether your platform is supported.

Here's the Raspberry Pi wired with I2C using the STEMMA connector:

  • Pi 3V to breakout VIN (red wire)
  • Pi GND to breakout GND (black wire)
  • Pi SCL to breakout SCL (yellow wire)
  • Pi SDA to breakout SDA (blue wire)
  • Breakout VIN to potentiometer positive (red wire)
  • Breakout A0 to potentiometer wiper (green wire)
  • Breakout GND to potentiometer negative (black wire)

Here's the Raspberry Pi wired with I2C using a solderless breadboard:

  • Pi 3V to breakout VIN (red wire)
  • Pi GND to breakout GND (black wire)
  • Pi SCL to breakout SCL (yellow wire)
  • Pi SDA to breakout SDA (blue wire)
  • Breakout VIN to potentiometer positive (red wire)
  • Breakout A0 to potentiometer wiper (green wire)
  • Breakout GND to potentiometer negative (black wire)

Python Installation of ADS7830 Library

You'll need to install the Adafruit_Blinka library that provides the CircuitPython support in Python. This may also require enabling I2C on your platform and verifying you are running Python 3. Since each platform is a little different, and Linux changes often, please visit the CircuitPython on Linux guide to get your computer ready!

Once that's done, from your command line run the following command:

  • pip3 install adafruit-circuitpython-ads7830

If your default Python is version 3 you may need to run 'pip' instead. Just make sure you aren't trying to use CircuitPython on Python 2.x, it isn't supported!

CircuitPython Usage

To use with CircuitPython, you need to first install the Adafruit_CircuitPython_ADS7830 library, and its dependencies, into the lib folder on your CIRCUITPY drive. Then you need to update code.py with the example script.

Thankfully, we can do this in one go. In the example below, click the Download Project Bundle button below to download the necessary libraries and the code.py file in a zip file. Extract the contents of the zip file, and copy the entire lib folder and the code.py file to your CIRCUITPY drive.

Your CIRCUITPY/lib folder should contain the following folders:

  • adafruit_bus_device/
  • adafruit_ads7830/
CIRCUITPY

Python Usage

Once you have the library pip3 installed on your computer, copy or download the following example to your computer, and run the following, replacing code.py with whatever you named the file:

python3 code.py

Example Code

If running CircuitPython: Once everything is saved to the CIRCUITPY drive, connect to the serial console to see the data printed out!

If running Python: The console output will appear wherever you are running Python.

# SPDX-FileCopyrightText: 2023 Liz Clark for Adafruit Industries
# SPDX-License-Identifier: MIT

# Simple demo to read analog input on channel 0

import time
import board
import adafruit_ads7830.ads7830 as ADC
from adafruit_ads7830.analog_in import AnalogIn

i2c = board.I2C()

# Initialize ADS7830
adc = ADC.ADS7830(i2c)
chan = AnalogIn(adc, 0)

while True:
    print(f"ADC channel 0 = {chan.value}")
    time.sleep(0.1)

The ADS7830 is initialized over I2C. Then in the loop, the analog input on A0 is read and printed to the serial monitor. As you adjust the potentiometer connected to A0, you'll see the values change.

To make code from different ADC's all compatible, we always return a 16-bit value (0 to 65535) even though, in this case, the underlying hardware is only 8-bit!

This guide was first published on Nov 13, 2023. It was last updated on Jul 15, 2024.

This page (CircuitPython and Python) was last updated on Jul 15, 2024.

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