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--- exploring_lora [2018/09/29 12:31] – [3.1. Modifying the Radio Parameters] samer
+++ exploring_lora [2018/09/29 12:59] – [3.1. Modifying the Radio Parameters] samer
@@ Line 67: / Line 67: @@
 ==== -. Modifying the Radio Parameters ====
 Download the {{ :sketch-1819.zip | basic sketches}} that implement a simple LoRa communication between the two modules: a client module and a server module. Open the sketches with Arduino IDE. Make sure to choose the correct ''Board'' and ''Port'' in the ''Tools'' menu.
-The typical configuration for LoRa modules consists of 125 kHz sub-channels, a coding rate of 4/5, and a spreading factor equal to 7. You can later modify these radio parameters in the ''setup'' function by choosing one the following data rates:
+Take a look at the source code in ''rf95_client.ino'' and ''rf95_server.ino''. Particularly, the ''setup'' function configures the radio parameters of your LoRa devices:
+  * Central frequency (freq)
+  * Spreading Factor (SF)
+  * Bandwidth (Bw)
+  * Coding Rate (CR)
+  * Transmit power (Pow)
-^  Data Rate   ^  Spreading Factor      ^  Bandwidth  ^
+<code c++>
-|  DR0         |	SF12            |  125kHz   |
+rf95.setFrequency(frequency);
-|  DR1         |	SF11            |  125kHz   |
+// Setup Power,dBm
-|  DR2         |	SF10            |  125kHz   |
+rf95.setTxPower(13);
-|  DR3         |	SF9             |  125kHz   |
-|  DR4         |	SF8             |  125kHz   |
-|  DR5         |	SF7             |  125kHz   |
-|  DR6         |	SF7             |  250kHz   |
-In order to reduce collisions, configure the central frequency of your LoRa modules as below:
+// Setup Spreading Factor (6 ~ 12)
+rf95.setSpreadingFactor(7);
+// Setup BandWidth, option: 7800,10400,15600,20800,31250,41700,62500,125000,250000,500000
+//Lower BandWidth for longer distance.
+rf95.setSignalBandwidth(125000);
+// Setup Coding Rate:5(4/5),6(4/6),7(4/7),8(4/8)
+rf95.setCodingRate4(5);
+</code>
+In order to reduce collisions, configure the central frequency of your LoRa modules as indicated below:
 ^  Group Number  ^   Frequency     ^