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--- doc:appunti:hardware:raspberrypi_thermostat [2022/01/12 16:47] – [Installing the new Adafruit LCD library] niccolo
+++ doc:appunti:hardware:raspberrypi_thermostat [2022/01/12 17:09] – [Installing the old Adafruit LCD library] niccolo
@@ Line 712: / Line 712: @@
 As reported above, the new **Adafruit CircuitPython PCD8544** library is more CPU intensive than the old discontinued one **[[https://github.com/adafruit/Adafruit_Nokia_LCD|Adafruit Nokia LCD]]**. Fortunately enough, the old library does run with Python 3, and I was able to use it on my old Raspberry Pi model B over the operating system derived from Debian 11 Bullseye. So the average CPU usage is **lower than 10%**, instead than **above 30%**!
-FIXME Describe the installation.
+The library is not available from the **[[https://pypi.org/|PyPI]]** repository, so it must be downloaded from the GitHub repository. The library depends upon **Adafruit_GPIO**, which in turn requires **Adafruit_PureIO** and **spidev**. The two Adafruit libraries are available from PyPI, for **spidev** we installed the Debian packaged version.
+<code>
+apt install python3-spidev
+mkdir -p /usr/local/download/Adafruit-GPIO
+cd /usr/local/download/Adafruit-GPIO
+pip3 download Adafruit-GPIO
+pip3 install Adafruit_PureIO-1.1.9-py3-none-any.whl
+pip3 install Adafruit_GPIO-1.0.3-py3-none-any.whl
+</code>
+We download the library from its **GitHub repository** and install it using **pip3**:
+<code>
+cd /usr/local/download
+git clone https://github.com/adafruit/Adafruit_Nokia_LCD.git
+cd Adafruit_Nokia_LCD/
+pip3 install .
+</code>
+The dependencies tree is the following:
+  * Adafruit_Nokia_LCD
+    * Adafruit_GPIO
+      * Adafruit_PureIO
+      * spidev
 ==== Installing the Telegram Bot Python library ====