--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/air-quality/hw.md	Tue Aug 13 22:38:39 2024 -0700
@@ -0,0 +1,15 @@
+# https://cdn.shopifycdn.net/s/files/1/0617/7190/7253/files/T-display-pin-diagram_1024x1024.jpg
+
+# https://www.aqmd.gov/docs/default-source/aq-spec/resources-page/plantower-pms5003-manual_v2-3.pdf
+
+
+    # pms pin 1 (blk) to 5V
+    # pms pin 2 (red) to gnd NEXT TO ESP PIN 12!!
+    # pms pin 3 (blk) NC
+# original setup
+# GPIO13/RXD2 num 16 = pms tx (pin 5 blk)
+# GPIO15/TXD2 num 17 = pms rx (pin 4 red)
+# or on T-Display ESP32, 
+#   pms tx pin 5 to esp 13
+#   pms rx pin 4 tp esp 17
+#   led strip: +5/gnd like pms; DIN to esp 27
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