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Update Code For Three Dollar EC PPM Meter for MCU

Description:
This code is a slight update of the last one, updated:This code is a slight update of the last one, updated:-Better Uptime Counter-LCD Shield-New Pin out Diagram-Restart Protected Calibration Details-EU and US Plug Calibrated Probe Also a quick update to the code so the calibration value will survive a power cut, we are storing the cell constant K [a float] in EEPROM as a scaled int, so there may be a slight change in the value following a reboot [but that small it wont make much difference].For Code See: www.MichaelRatcliffe.com/projects or look at the project LOG at either Element14 or HAD:http://www.element14.com/community/community/design-challenges/vertical-farming/blog/2015/09/19/automated-green-house-blog101--update-code-for-three-dollar-ec-ppm-meter-for-mcuhttps://hackaday.io/project/7008-fly-wars-a-hackers-solution-to-world-hunger/log/25459-update-code-for-three-dollar-ec-ppm-meter-for-mcu

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