It's easy to use the TSC2007 with Python or CircuitPython, and the Adafruit CircuitPython TSC2007 module. This module allows you to easily write Python code that reads the distance from the TSC2007 sensor.

You can use this sensor 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 a TSC2007 to your board exactly as shown below. Here's an example of wiring a Feather M4 to the sensor with I2C using one of the handy STEMMA QT connectors:

  • Board 3V to sensor VIN (red wire)
  • Board GND to sensor GND (black wire)
  • Board SCL to sensor SCL (yellow wire)
  • Board SDA to sensor SDA (blue wire)

You can also use the standard 0.100" pitch headers to wire it up on a breadboard:

  • Board 3V to sensor VIN (red wire)
  • Board GND to sensor GND (black wire)
  • Board SCL to sensor SCL (yellow wire)
  • Board SDA to sensor SDA (blue wire)

Python Computer Wiring

Since there's 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 to the sensor using I2C and a STEMMA QT connector:

  • Pi 3V to sensor VIN (red wire)
  • Pi GND to sensor GND (black wire)
  • Pi SCL to sensor SCL (yellow wire)
  • Pi SDA to sensor SDA (blue wire)

Finally here is an example of how to wire up a Raspberry Pi to the sensor using a solderless breadboard:

  • Pi 3V to sensor VIN (red wire)
  • Pi GND to sensor GND (black wire)
  • Pi SCL to sensor SCL (yellow wire)
  • Pi SDA to sensor SDA (blue wire)

Python Installation of TSC2007 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-tsc2007

If your default Python is version 3, you may need to run pip instead. 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 TSC2007 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 folder and file:

  • adafruit_bus_device/
  • adafruit_tsc2007.mpy
CP

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

# SPDX-FileCopyrightText: Copyright (c) 2022 ladyada for Adafruit Industries
#
# SPDX-License-Identifier: Unlicense


import board
import adafruit_tsc2007

# Use for I2C
i2c = board.I2C()

irq_dio = None  # don't use an irq pin by default
# uncomment for optional irq input pin so we don't continuously poll the I2C for touches
# irq_dio = digitalio.DigitalInOut(board.A0)
tsc = adafruit_tsc2007.TSC2007(i2c, irq=irq_dio)

while True:
    if tsc.touched:
        point = tsc.touch
        if point["pressure"] < 100:  # ignore touches with no 'pressure' as false
            continue
        print("Touchpoint: (%d, %d, %d)" % (point["x"], point["y"], point["pressure"]))

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.

adafruit_products_repl.png
REPL printout

Attach a resistive touch screen to the TSC2007 with the FPC connector or the four X/Y contacts. Now try touching different spots on your attached resistive touchscreen to see the values change!

First you import the necessary modules and libraries. Then you instantiate the sensor on I2C.

Then you're ready to read data from the sensor, including the initial information printed to the serial console.

Finally, inside the loop, you check the coordinates where pressure is detected.

The first number is the X coordinate, the second number is the Y coordinate and the last number is the Z "pressure" coordinates that can tell you how hard the touch pad is being pressed

That's all there is to using the TSC2007 with CircuitPython!

This guide was first published on Apr 05, 2022. It was last updated on 2022-04-05 19:21:25 -0400.

This page (Python & CircuitPython) was last updated on May 24, 2022.

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