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diff --git a/gas_sensors_spectrum/docs/notes b/gas_sensors_spectrum/docs/notes
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--- /dev/null
+++ b/gas_sensors_spectrum/docs/notes
@@ -0,0 +1,40 @@
+there are o2 sensors
+
+o2-a1
+o2-a2
+o2-a3
+
+
+first sensor type is a two pin model. this outputs a uA current.
+there is a 2nd type (same o2 sensor above) but three pins.
+
+
+my guess is that 1 and 3 are power pins, 2 is signal
+
+
+
+two pin model is replacable on dkey with sgx-40x
+uA current is near identical
+
+three pin model is replacable with ec410 though that is $30 more.
+
+Save $30 by hacking the three pin board (which is near identical) to be
+the two pin model. 
+
+Making a foshw vers of these boards is trivial
+
+
+There is a problem with electrochemical gas sensors. some of the main brands
+(alphasense, and citicel) only supply to OEM. The OEM doesn't easily supply replacements (i.e. honeywell).
+i will have to search some more.
+
+in any case, this is left to the consumer to either gamble on a $150 seller in IL, or buy the $40 china option.
+people will go to china every time.
+
+because there is no official distributor that resells the products, consumers get shafted.
+this is a shitty move by the companies. 
+
+there are some options on dkey, but may not be 1:1 compatible (depends on the sensor).
+more testing on output needed
+
+why can't we just have official distributors instead of dealing with the OEM nonsense. mafia system. 
\ No newline at end of file
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