Update readme

README.md

@@ -1,7 +1,6 @@
 # Vulpes
 An ESP32-based radio orienteering controller. This repo is for
-the code. There will be another repo for the schematic and PCB
-design.
+the code. See below for hardware comments and a link.
 
 ## What
 Radio orienteering, or amateur radio direction finding (ARDF) is a 
@@ -11,13 +10,14 @@ it when and what to transmit.
 
 This is my attempt at a simple, easy-to-use controller with a low 
 parts count. Rather than programming a microcontroller and/or 
-using DIP switches, time delays, and sync cables, the ESP32 development
+using DIP switches, delayed starts, and sync cables, the ESP32 development
 board lets you set up each controller using a web browser (e.g., on your
 smartphone or tablet).
 
 The [ARRL ARDF page](https://www.arrl.org/amateur-radio-direction-finding) 
 is an OK starting point for learning about radio orienteering, but 
-there are probably better ones.
+there are probably better ones. I've never done an RO event before, but have
+experience racing and directing adventure races.
 
 ## Hardware
 I designed a simple custom printed circuit board (PCB) to make
@@ -25,11 +25,15 @@ assumbling this controller easy to do. The repo for schematic and
 board design is here: [vulpes_hardware](https://amiok.net/gitea/W1CDN/vulpes_hardware).
 
 Because the ESP32 doesn't track time when it is powered off, and
-I wanted to avoid specific delays (e.g., push a button two hours
+I wanted to avoid delayed starts (e.g., push a button exactly two hours
 before an event starts), an additional real-time clock (RTC) is 
 included. The RTC runs on a watch battery to track time when the
 controller is not powered on.
 
+Morse code is sent according to the parameters set up in the UI. The GPIO
+pin triggers a transistor that acts as a switch to close the key connection
+on the radio. Code is also shown on the onboard LED of the ESP32 dev board.
+
 ## Software/Firmware
 Power on the controller by plugging in a micro-USB cable to a 5V 
 source (e.g., computer or battery pack). After the device is powered on,
@@ -41,14 +45,39 @@ to `http://192.168.0.1` (note "http" not "http**s**"). You will see the
 settings below. Note that you will not be able to access the Internet while
 connected to this network, and each controller sets up a separate network.
 
+**Web UI**
+![screenshot of the Vulpes web UI](doc/vulpes_gui.png)
+
 ### General Settings
+- **Sending Program**
+    - Off - nothing is sent
+    - Continuous - the message in `Message` is sent to the key GPIO and the
+    onboard LED
+    - Cycle - the message in `Message` is sent according to the `Cycle Settings`
+- **Message**
+    - Custom Message - a message defined in `Custom Message`
+    - MOE - transmitter 1 message (dit)
+    - MOI - transmitter 2 message (dit dit)
+    - MOS - transmitter 3 message (dit dit dit)
+    - MOH - transmitter 4 message (dit dit dit dit)
+    - MO5 - transmitter 5 message (dit dit dit dit dit)
+- **Custom Message** - a custom message to be sent when "Custom Message" is selected in `Message`
+- **Speed** - speed of Morse code transmission in words per minute (WPM)
 
 ### Cycle Settings
+These settings only apply when "Cycle" is chosen under `Sending Program`
+- **Cycle Start Time** - when to start the next cycle/event (only HH:MM:SS day-of-month matter)
+- **Step Length** - how long this transmitter will transmit on each cycle
+- **Cycle ID** - what order transmitter is this (1st, 2nd, 3rd, etc.)
+- **Number of Transmitters** - how many transmitters there are
 
 ### Network Settings
-#### Access Point
-When using as a wireless access point, the network SSID is "vulpes"
-with no password. Navigate to http://192.168.0.1 to access webform.
+The `Submit and Reboot` button only affects these fields.
+
+#### Network access
+- **Access Point** - when using as a wireless access point, the network SSID is "vulpes"
+with no password. Connect to wireless network "vulpes" and point your browser to URL http://192.168.0.1 (http, not https)
+- **Existing Wireless Network** - connect to the same existing network and use the proper IP address (useful if you have access to the router or a serial connection). If an existing network can't be connected to, an access point will be set up. 
 
 ## License
 GNU GPLv3. See `LICENSE` file for details, and 
@@ -64,3 +93,5 @@ for similar design insparation.
 ## Questions and Contributing
 Until I get Gitea set up completely, please email me at w1cdnQRTw1cdn.net, 
 but replace "QRT" with @.
+
+I developed the C++ code in Visual Studio Code (VSCode).