try sending

logdata_visualization/testsender/testsender.pde

@@ -1,4 +1,19 @@
-// Example by Tom Igoe
+//Note for HC12 433mhz module
+/*
+connect to 3v3 or 5v.
+config: bridge set pin to ground and power on
+connect with arduino serial monitor (can send written line at once). 9600baud
+AT+RX  , shows all configs
+default: 
+  OK+B9600
+  OK+RC001
+  OK+RP:+20dBm
+  OK+FU3
+
+change baud to 115200:
+  AT+B115200
+ RC001 is frequency of 433.4MHz. rc100 is 473.0MHz 
+*/
 
 import processing.serial.*;