Arduino connection help

The problem is the limited memory resources both SDRAM and flash. Have you looked at how much is currently used? You may want to approach this from another angle. If you tie in a Raspberry Pi 3, you can use UART to communicate and handle the higher level functions on the Pi 3 IMHO.

See.... In my schematics... Along with the leds i want to display the sensor values on a lcd screen... Is it possible?

Possible if you look at the above comment

You should be able to do it but

You will need to use a WS5100 type ethernet shield as it will offload some of the software to the hardware. It will plug into the Arduino UNO, it uses pins 10,11,12,13

you will need to move the LEDs to other pins as the ethernet shield will use the ones your currently using

you can get an LCD display that can use I2C interface (A4, A5) to display status etc. A 16x2 or a 20x4

Memory will be tight but it is doable

All libraries and hardware are plentiful, just search for "I2C arduino display", or "Arduino Ethernet Shield 5100" you will find plenty of info

Can you please give me a drawn schematic?

Hand drawn or out of a computer?

Perhaps take a look at this Arduino tutorial on LCD displays to get started:

Tutorial 13 for Arduino: Liquid Crystal Displays

If you want something more graphical then you could perhaps take a look at one of these type of displays:

Resistive 4.3" GEMmodule

which off-load the graphics processing onto the display module only requiring the data updates to be sent over a UART serial connection from the Arduino.

As for the Ethernet shield, have you taken a look at:

https://www.arduino.cc/en/Guide/ArduinoEthernetShield

Tom Igoe has written an interesting book called 'Making Things Talk' which covers this sort of area, so you may want to try and get hold of a copy. The 3rd edition is due to be published soon:

https://www.amazon.co.uk/Making-Things-Talk-Sensors-Networks/dp/1680452150/ref=la_B001K8AUGU_1_5

Looking at your breadboard layout your analogue inputs don't look correct to me.

Firstly it looks like you have misaligned the lower ground connection from the Arduino to the breadboard power rail in such a way that the 10k resistors are not tied to ground but just to each other.

Secondly if the 10k resistors were tied to ground then your three analogue inputs would also all be tied to ground which would not be of much use.

The photo resistor for example is normally set up as a potential divider circuit so your analogue input would be  taken from the midpoint between the resistor and the photo resistor as per this circuit:

https://www.arduino.cc/en/Tutorial/AnalogInput

Also perhaps be aware that the power rails on some breadboards are not continuous but instead are interrupted half way along. You may find that you need to place a jumper on your ground rail between block 5 and block 6 to continue the ground rail to reach the 10k resistors. Alternatively move your ground wire from the Arduino two blocks to the right.

The same may apply to your +5v rail at the top as it may not reach the components at the right hand side of the breadboard.

Can u please give me a hand drawn schematic of the modified connections? Please give