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--- doc:appunti:hardware:raspberrypi_thermostat [2022/01/12 16:44] – [Starting the protherm service at bootstrap] niccolo
+++ doc:appunti:hardware:raspberrypi_thermostat [2022/01/12 16:51] – [Installing the old Adafruit LCD library] niccolo
@@ Line 659: / Line 659: @@
 ==== Installing the new Adafruit LCD library ====
+**WARNING**: Do not use this library on the old Raspberry Pi model B, it is too CPU intensive! Use the old one.
 **WARNING**: The new library is more CPU intensive than the old one. I opened an **[[https://github.com/adafruit/Adafruit_CircuitPython_PCD8544/issues/16|issue on GitHub]]**. So I decided to give-up with the new library and use the old one (see below for installation tips). Here you can see a CPU utilization graph, the first half is using the old library, the second half is using the new one:
@@ Line 710: / 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.
+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>
 ==== Installing the Telegram Bot Python library ====