Basic Plant example doc

Examples/Microsoft.PowerShell.IoT.Plant/README.md

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+# Example module Microsoft.PowerShell.IoT.Plant
+
+This PowerShell module is for automating taking care of potted indoor plants.
+
+This module allows a PowerShell script to control lights and water a plant when needed based on soil moisture level.
+
+This showcases GPIO functionality of [the Microsoft.PowerShell.IoT module](../../README.md).
+
+## Hardware setup
+
+Hardware pieces:
+
+* For lights:
+  * Desktop lamp
+  * [Plant-specific light bulb](https://www.amazon.com/dp/B07567BPVH/ref=sspa_dk_detail_5?psc=1&pd_rd_i=B07567BPVH&pd_rd_wg=5iTv6&pd_rd_r=WYCAF6212XNJ9NQ14E5Q&pd_rd_w=2u0Gj)
+  * [Power relay for power mains (for the lamp)](https://www.amazon.com/POWERSWITCHTAIL-COM-PowerSwitch-Tail-II/dp/B00B888VHM/ref=sr_1_1?ie=UTF8&qid=1518818881&sr=8-1)
+* For watering:
+  * [Small water pump](https://www.adafruit.com/product/1150)
+  * [Power Relay for 12V DC](https://www.ebay.com/itm/5V-2-Channel-Relay-Module-Shield-For-Arduino-PIC-ARM-DSP-AVR-Electronic-US/162876526032)
+  * [12V DC PowerAdapter (for water pump)](https://www.adafruit.com/product/798)
+  * [Soil moisture sensor](https://www.ebay.com/i/122408308563?chn=ps)
+
+Default pin configuration of Microsoft.PowerShell.IoT.Plant module:
+
+* Water pump relay connected to GPIO pin 0.
+* Light relay connected to GPIO pin 2.
+* Soil moisture sensor sends data to GPIO pin 5.
+
+Wiring diagram will be published shortly.
+
+## Software setup
+
+### Install PowerShell Core on Raspberry Pi
+
+Installation instructions can be found [here](https://github.com/PowerShell/PowerShell/tree/master/docs/installation/linux.md#raspbian).
+
+### Start Powershell and install modules
+
+```powershell
+sudo pwsh
+Install-Module -Name Microsoft.PowerShell.IoT
+git clone https://github.com/PowerShell/PowerShell-IoT.git
+Import-Module ./PowerShell-IoT/Examples/Microsoft.PowerShell.IoT.Plant
+```
+
+### Manual operation
+
+```powershell
+PS /home/pi> # working with light
+PS /home/pi> Set-Light On
+PS /home/pi> Set-Light Off
+PS /home/pi> 
+PS /home/pi> # working with water
+PS /home/pi> Start-Water
+PS /home/pi> Stop-Water
+PS /home/pi> 
+PS /home/pi> # reading soil moisture level
+PS /home/pi> Read-SoilIsDry
+```
+
+### Automated operation
+
+See `full-plant-demo.ps1`.
+
+This script runs 2 PS jobs - one controls light, the other - water.
+
+For demo purposes script runs for 2 minutes. Adjust timeouts in the script for your scenario.