The picture is fine. I just download from the site where the picture is and ZOOM it. Al least, the picture is clear.
It look and connect fine, beside the wires mess. I did not see if you connect to A2 and A4 and the resistor at the LM335 is 2.2 K. Look more Brown - Brown - Brown. Just double check on that.
Beside the mess and the connections, it look fine. I am a bit lost. :~
Here I will do :
- Remove the whole circuit.
- Just wired the LM335 , the limiting resistor of 2.2 K , +Vcc, GND, and connect to an analog pin.
- Measured the voltage at the analog pin point / cathode of the LM335. <-- I hope you do have a Digital Multi Meter
---> If measured close to the Vcc or GND.... Bad News : LM335 is Bad. The voltage should reflect your room temperature. - Do a simple code that read the value - voltage - temp calculation and display toward the serial monitor. <-- No DMM available