Update README

README.md

@@ -1,8 +1,19 @@
-# (Work In Progress) is-iot-collector
+# is-iot-collector
+
+This repository represents the collector module of an IoT Irrigation System that:
+1. Collects data from the field and sends it to the sink module via MQTT.
 
 ### System requirements
 The application was developed on Raspberry Pi Zero W/Zero W 2 with Raspbian Buster as operating system, written in Python3.7. 
 
+### Electric connections
+![collector-electric](https://user-images.githubusercontent.com/51260103/178805085-dc51ea45-6ad1-43d8-a8eb-09392ef2a30c.jpg)
+  1. 2x Capacitive Soil Moisture Sensors -> [source](https://www.amazon.com/Gikfun-Capacitive-Corrosion-Resistant-Detection/dp/B07H3P1NRM)
+  2. 1x DHT22 Air Temperature and Humidity -> [source](https://www.amazon.com/HiLetgo-Temperature-Humidity-Electronic-Practice/dp/B0795F19W6/ref=sr_1_3?keywords=dht22&qid=1657737065&sr=8-3)
+  3. 1x DIY Light Intensity Sensor
+  ![LDR](https://user-images.githubusercontent.com/51260103/178808536-c2a7e598-0080-486c-b2e6-be6790812f13.jpg)
+  4. 1x ADS1015 Analog To Digital Converter -> [source](https://www.amazon.com/Comidox-channel-Development-Programmable-Amplifier/dp/B07KW2QZS2/ref=sr_1_4?crid=11S1RP1SKMJOI&keywords=ads1015&qid=1657738141&sprefix=ads101%2Caps%2C217&sr=8-4)
+
 ### Install prerequisites
 ```
 sudo apt-get update
@@ -26,6 +37,18 @@ source env/bin/activate
 pip install -r requirements.txt
 ```
 
+### Configure enviroment variables
+#### Change default values
+```
+cp .env.example .env
+nano .env
+```
+`Note: Replace the environment variables with your values. All variables need to be defined!!!`
+#### Export environment variables
+```
+set -o allexport; source .env; set +o allexport
+```
+
 ### Configure system setup
 ```
 nano setup.xml