*
* v_pyro \
* 100k igniter
- * output /
+ * output /
* 100k \
* sense relay
- * 27k /
- * gnd ---
+ * 27k /
+ * gnd ---
*
* If the relay is closed, then sense will be 0
* If no igniter is present, then sense will be v_pyro * 27k/227k = pyro * 127 / 227 ~= pyro/2