Update README.md

README.md

@@ -5,6 +5,18 @@ FreeBSD 14. It is capable of taking temperature and humidity every 5
 seconds and storing them into a database. The measurements can then be viewed
 using either the integrated display, or, they can be exported to a USB drive.
 
+# Goals
+
+One of the most important goals for this project is that this device should be
+low maintenance. Therefore, you should not have to connect it to a computer or
+the network for years at a time. As this device has not yet been in service for
+more than a few weeks, this cannot yet be guaranteed, however, it has been
+designed to, at least in theory, be capable of this. It allows you to change the
+device's time, date, and timezone from the built in display, as well as allowing
+you to export data and clear the internal storage of collected data. Finally, it
+should be able to survive a full drive, however, as there are a lot of
+variables, it may not be able to.
+
 # Contents
 1. [Construction](#construction)
 2. [OS Preparation](#os-preparation)
@@ -20,7 +32,7 @@ The following is a general list of materials required:
 - 4x Push button
 - 1x DHT11/DHT22 [^2]
 - 1x DS3231 (or other RTC)
-- 1x 16x2 HD44780U based LCD (such as a 1602 LCD)
+- 1x 16x2 HD44780U based LCD (such as a 1602 LCD, not I²C)
 - 1x N-channel MOSFET (optional, for turning off the screen)
 - 1x Schottky diode (optional, for turning off the screen)
 - 1x 1kΩ resistor [^3]
@@ -140,7 +152,7 @@ hint.gpioths.0.pins=2097152
 ds3231_load="YES"
 # The I2C bus the controls the pins the sensor is connected to
 hint.ds3231.0.at=iicbus0
-# The *8 BIT* address of the sensor. The following is the default for a DS3131
+# The *8 BIT* address of the sensor. The following is the default for a DS3231
 # addr = 0xd0
 hint.ds3231.0.addr=208
 ```
@@ -150,7 +162,7 @@ how to use it, execute `man vi` or see [vi(1)][7].
 
 [7]: https://man.freebsd.org/cgi/man.cgi?query=vi&manpath=FreeBSD+14.0-RELEASE+and+Ports
 
-The next step is to enable I²C for the DS3131. Once again, *append* the
+The next step is to enable I²C for the DS3231. Once again, *append* the
 following to the end of the `[all]` section of the `/boot/msdos/config.txt`
 file:
 
@@ -235,10 +247,10 @@ default options. These can also be changed after installation by editing
 `/usr/local/etc/rpi4b-temp-humidity/config.conf`.
 
 Once you have configured everything to your liking, execute the following
-commands to build and install the software.
+command to build and install the software.
 
 ```sh
-make all install
+make install
 ```
 
 # Configuration
@@ -253,8 +265,6 @@ sysrc rpi4b_temp_humidity_config_file="/path/to/your/config/file"
 service rpi4b-temp-humidity enable
 ```
 
-# Usage
-
 The following command line flags are supported:
 
 - `-h`: print a simple help message, then exit
@@ -273,3 +283,12 @@ the [sysrc(8)][10] command).
 
 [9]: https://man.freebsd.org/cgi/man.cgi?query=rc.conf&manpath=FreeBSD+14.0-RELEASE+and+Ports
 [10]: https://man.freebsd.org/cgi/man.cgi?query=sysrc&manpath=FreeBSD+14.0-RELEASE+and+Ports
+
+# Usage
+
+The buttons from closest to the display to farthest are: select, back, up, and
+down. When the device first turns on, the stats screen will be shown. This screen
+displays the current temperature, humidity, and time. Pressing the back button
+will take you to the main menu. The following is a short description of each screen:
+- "Stats by" screen shows stats by a specific period (e.g. hour, day, week)
+-