added sources

xpbowler · Oct 22, 2022 · ea83310 · ea83310
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 Software for model rocket 
 Includes: PID control, Madgwick filter
 
+# Hardware sources
+Arduino/teensy interrupts: https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/
+
+# Software Sources
+Linking C files using GCC: https://randerson112358.medium.com/link-c-programs-7282712fca1f
+(this may be necessary to produce a single *c* $\rightarrow$ *.ino* file in order to upload onto teensy)