4-digit 7-segment led display thermometer using 1N4148 diode

original version (written in Romanian)

   You can made a cheap thermometer using few components: clone Arduino board (in my case, I use Arduino Nano board with uC ATmega 168, but work with Arduino nano with ATmega328, Arduino Uno, leonardo, etc), a 1N4148 diode, 4-digit 7-segment led display with common cathode or common anode (just few changes in sketch), an breadboard and some wires.
   Schematic is very simple:

  I write first sketch named diode_thermometer_display_1.ino and on dissplay temperature is as integer:

,

but if it use diode_thermometer_display_2.ino sketch, value is with decimal value:

   I use info from article https://www.hackster.io/microst/thermometer-diode-based-524613 and I test sketch:

see 1N4148 diode as temperature sensor movie:

   For project with display, I made thermometer with 1N4148 diode as sensor on multiplexed led display

   For understand how can be use a diode as temperature sensor see figure 1 from 1N4148 diode datasheet

and article:
- DIODE-BASED TEMPERATURE MEASUREMENT (Burr-Brown)
- Accurate Temperature Sensing with an External P-N Junction (Linear Technology)