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+# Environmental sensor
+
+## CO₂
+
+https://sensirion.com/products/catalog/SEK-SCD41/
+
+https://github.com/Sensirion/arduino-i2c-scd4x
+
+connector: JST PH 2.0mm 4 pin
+
+## particulate
+
+https://sensirion.com/products/catalog/SPS30/
+
+https://github.com/Sensirion/arduino-sps
+
+connector: JST ZH 1.5mm 5 pin
+
+## controller
+
+http://www.lilygo.cn/claprod_view.aspx?TypeId=62&Id=1391&FId=t28:62:28
+
+https://github.com/Xinyuan-LilyGO/LilyGo-T5-ink-series
+
+battery: JST 1.25mm 2 pin
+    
+## breadboarding
+
+μC:
+* 21 SDA green
+* 22 SCL yellow
+
+SCD41:
+* 1 SCL yellow
+* 2 GND black
+* 3 VDD white/red
+* 4 SDA green
+