Two-Way 8-Bit Serial Communication Between Arduino Master and Slave With Sensors and LCD

In this task you are required to create a two way serial communication between two Arduino microcontrollers. The
first microcontroller, which should be a slave, should have two sensors. First sensor should be a temperature sensor
and the second should be a light sensor. This microcontroller should accept several commands. The communication
should be done over 8 bits. The first set of commands is to trigger a read on sensor. A command of 129 should select
the first sensor where 130 should select the second sensor. After these commands, for the next 8 clock signals, the
device should supply the requested value. The second set of commands control which units the device should supply
the temperature in. Command 65 should select celcius, 66 should select fahrenheit, 67 should select raw value scaled
to 8 bits.
The second microcontroller will be the master device and should have and LCD. You may use built-in LiquidCrystal library to control the LCD. Every second, the master device should read temperature in celcius, fahrenheit
and raw form and should read light sensor value. These values should be displayed on the LCD screen.
Draw your circuit and write your program on this page.

This looks like class/lab work for a degree course. If that is the case, then tell us how you would go about it and I an sure someone will offer some feedback. Post a block diagram of the system with some detail on the Arduino I/O being used, and some pseudo code as well.
Cheers,
Richard

Hello
Obviously I can't do all the work for you.
I can suggest you that you can use a serial communication between the two microcontrollers, by connecting the port two with port three and vice versa, with an appropriate communication firmware.
Cheers
Giovanni