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--- loramessenger:project [2021/07/16 07:44] – [Lora Messenger] neilhao
+++ loramessenger:project [2023/02/11 17:30] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-====== Lora Messenger ======
+====== Compact Lora Messenger ======
 == - Optimized RF Design for Maximum Coverage ==
-Neil Hao
+[[http://uniteng.com/index.php/about-me/|Neil Hao]]
+Starts from 2021/Jul/09 to ~~LASTMOD~~ (Last Modification)
--Jul-2021
 ===== Overview =====
-This project aims to design a Lora Messenger which does not depend on Internet or Cellular network. In other words, users can chat with others by using this credit card size Lora device and a smartphone with Bluetooth without Internet and Cellular network.
+This project aims to design a credit card size Lora Messenger which does not depend on Internet or Cellular network. In other words, users can chat with others by using this credit card size Lora device and a smartphone with Bluetooth without Internet and Cellular network.
 For the hardware design, a high efficiency compact Lora PCB Antenna and an ultra-low noise figure amplifier had been designed for maximum the communication range.
@@ Line 18: / Line 20: @@
 The coverage of this credit card size Lora device was tested in the urban area. In the experiment (TX:14dBm, Freq:915Mhz, Spreading Factor:12), 1500m communication distance had been tested, no timeout or re-transmitting occurred.  According to the link budget, this system could reach far further than 1500m.
-[[https://www.youtube.com/watch?v=Rsd4tXtQQUE|Demo Video]]
+[[https://www.youtube.com/watch?v=Rsd4tXtQQUE|Demo Video (YouTube)]]
+----
 ===== Hardware Design =====
@@ Line 72: / Line 78: @@
 {{ :loramessenger:lora_pcb_antenna_xy.png?direct&400 |}}
 XY Plane
+----
 ===== Software Design =====
 |Evaluation Firmware|{{ :loramessenger:lora_esp32_evaluation_firmware.zip |}}|Version: 08 Jul 2021|
@@ Line 127: / Line 135: @@
 {{ :loramessenger:lora_receiving_process.png?direct |}}
 Note: Lora Receiving Process will be called consecutively.
+----
 ===== Resource =====
 |Schematics|{{ :loramessenger:lora_messenger_schematics.pdf |}}|Version: 25 May 2021|
@@ Line 134: / Line 144: @@
 |Android App | [[https://play.google.com/store/apps/details?id=de.kai_morich.serial_bluetooth_terminal&hl=en_US&gl=US|Serial Bluetooth Terminal]] |Retrieved Jul 11, 2021|
+----
 ===== Reference =====
 [1] Richard Wallace. Design Note DN024: Monopole PCB Antenna with Single or Dual Band Option . Retrieved Jul 11, 2021, from https://www.ti.com/lit/an/swra227e/swra227e.pdf?ts=1625872783255