Add doc (#115)

Terkwood · Mar 2, 2020 · bd814bb · bd814bb
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diff --git a/README.md b/README.md
@@ -34,9 +34,7 @@ Includes configuration for a google container OS instance.  Runs a small Rocket.
 
 ## Resources 
 
-- Background: https://twitter.com/Terkwood/status/1044992354178994178?s=19
 - pH sensor wiring and example code: https://www.element14.com/community/docs/DOC-89396/l/arduino-projects-for-arduino-day-water-and-irrigation-projects-part-2
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 - LED with scrolling text tutorial: https://gustmees.wordpress.com/2018/04/08/first-steps-with-the-arduino-uno-r3-maker-makered-coding-scrolling-text-with-8x8-led-matrix/amp/?__twitter_impression=true
 - Cross compiling rust for armv7 from MacOSX using vagrant: https://medium.com/@wizofe/cross-compiling-rust-for-arm-e-g-raspberry-pi-using-any-os-11711ebfc52b
 - Cross compiling OpenSSL: https://assil.me/2017/09/30/cross-compile-openssl-arm-zynq.html

diff --git a/microcontrollers/README.md b/microcontrollers/README.md
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+# Microcontroller gadgets
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+[PH and Submersible Temp Sensor](ph_temp_sensor_esp8266) are implemented using a DF Robot SEN0169, which [has documentation here](https://wiki.dfrobot.com/Analog_pH_Meter_Pro_SKU_SEN0169).
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		# Microcontroller gadgets

		[PH and Submersible Temp Sensor](ph_temp_sensor_esp8266) are implemented using a DF Robot SEN0169, which [has documentation here](https://wiki.dfrobot.com/Analog_pH_Meter_Pro_SKU_SEN0169).