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--- drone_communications [2022/09/28 01:21] – [IP for Drones] jhagstrand
+++ drone_communications [2023/09/10 02:32] (current) – [Cellular] jhagstrand
@@ Line 16: / Line 16: @@
   * Sensor readings: GPS, compass, altimeter, speed, orientation
   * Battery charge level
+Three sets of data to be communicated
+  - flight commands, radio to drone
+  - Telmetry, drone to GCS
+  - Video stream, drone to GCS
 ===== Three transmission types =====
@@ Line 142: / Line 148: @@
 an internet is a connection of two or more local networks\\
 "the Internet" is the global connection of every computer and device on the planet\\
+== port forwarding ==
+Through port forwarding you can make a device in your home available to the public internet.
+devices in your home have a local IP address assigned by the Access Port\\
+if the Access Port has an internet connection, then the host server will also assign a global IP address\\
+but that address is used internally only, it is NOT available publicly,\\
+UNLESS you do port forwarding\\
+Managing a local network.
 == Internet of Things (IoT) ==
@@ Line 211: / Line 229: @@
 AT (Attention) commands, were created by Dennis Hayes for his 300 baud modem in 1981.
+Tutorial: Use an ESP8266 to control an LED over the internet \\
+https://maker.pro/esp8266/tutorial/esp8266-tutorial-how-to-control-anything-from-the-internet
+== ESP8266 Development Board ==
+There are several "development" boards available which include an ESP8266 plus additional components.
+  * Wemos D1 Mini
+  * NodeMCU
+  * Adafruit Heather Huzzah
+  * ESP8266 Thing Development Board, has onboard FTDI USB-to-Serial chip
@@ Line 217: / Line 246: @@
 Create an Access Point (AP) that allows only one connection. \\
 Not used as a hub, but used for point-to-point communications between two devices.
+===== Speeds =====
+Hz - hertz, a measure of bandwidth \\
+bps - bitrate, limited by bandwidth and SNR \\
+==== RC ====
+MHz (older analog RC gear in the US)  \\
+MHz (older analog RC gear in Europe)  \\
+MHz (RC and telemetry, in Europe)  \\
+-915 MHz (video and telemetry, in the US)  \\
+.3 GHz (video)  \\
+.4 GHz (digital RC gear, video and telemetry)  \\
+.8 GHz (video)  \\
+https://diydrones.com/profiles/blogs/some-tips-on-picking-frequencies
+==== Cellular =====
+G  \\
+G  \\
+G  \\
+G - theoretical max: 10 GHz  \\
+=== 5G vs 5GHz ===
+G - 5th generation cellular networks, a marketing term designed to be vague and misleading \\
+GHz - a wifi band at 5000 hertz, as opposed to the alternative 2.4 GHz \\
+==== Wifi ====
+.4 GHz  \\
+GHz
+==== ESP32-C5 ====
+The ESP32-C5 comes with dual-band WiFi 6 (802.11ax) and still has the backward compatible 802.11b/g/n.
+//Has this been used with Arduino at 5 GHz?//
+https://www.espboards.dev/blog/connect-esp32-to-5ghz-wifi/
+==== Espressif ====
+The company that makes the ESP chips and boards.\\
+Open source. \\
+IPO on Shanghai Stock Exchange (SSE) in June 2019.\\
+https://www.espressif.com/en