BotronikS - Final code for all types of Arduino and PC users: -- HOME -- email:

Arduino required accessories:  
TM1637 LED display - 1 - 2 - 3
sensor DHT22: 1 - 2 - 3
or sensor AM2302: 1 - 2 - 3
or sensor AM2305: 1 - 2 - 3
or sensor AM2315C: 1 - 2 - 3
connections (click to enlarge)
additional accessories

TEHUM4: Measurement temperature and relative humidity (4x sensor DHT22/AM2305...) and show at one LED display - FREE!
For Arduino boards: NANO or UNO or MEGA
Electrical and practical notes:
Uses 9V/1A external power supply (VIN/GND) on DC plug (or external 5V/1A on 5V/GND pin).
Display of the measured value is in the form of one decimal digit.
Use specified type of 7 segments display with decimal points only (not clock dots).
S1 switch selector for temperature display in Celsius or Fahrenheit
P1 Display brightness selection potentiometer (0-7)
Download the HEX codes below, unpack and upload to the proper Arduino board (Use a free net tool for example XLoader)
1. uc ATmega328-16MHz-5V (NANO,UNO...) - TEHUM4code1-m328
2. uc AtMega2560 (Mega(ATMEGA2560).....) - TEHUM4code1-m2560

User guide manual:
t1 xxx h1 xxx (temp. and humidity from Sensor1)
t2 xxx h2 xxx (temp. and humidity from Sensor2)
t3 xxx h3 xxx (temp. and humidity from Sensor3)
t4 xxx h4 xxx (temp. and humidity from Sensor4)