2 Channel Temperature Humidity Standalone SD card DATALOGGER DHT22, AM2302, AM2305

1. What is this?

This is 2 channel temperature and humidity data logger with measuring temperature range -40 … + 80 °Celsius (-40 … + 185 °Fahrenheit) and humidity range 0…99% RH which work with digital temperature and humidity sensor DHT22. All measured temperature and humidity data are stored on the external sd card. This temperature and humidity data logger is fully standalone and not necessary connect it to pc for data stored. Real-live data are transferring via usb cable in *TXT format.

2. Device specification:

• Size - width 43mm, length 107mm, height 25mm
• Device weight - 120gr
• Colorful TFT 2.4 inch 240x320 display
• Temperature and humidity probe type - digital sensor DHT22
• Temperature measuring range: -40 …+80 °C / -40 … +185 °F
• Temperature accuracy - ±0.5°C / (-40 ~ 80°C / -40 ~ +185 °F)
• Humidity measuring range: 0…99%
• Resolution temperature and humidity - 0.1 °C / 0.1 °F
• Sensor wire length can be extended up to 10 meters
• Power supply – usb type-C
• Device current - max 100mA
• Usb speed - 115200
• Usb driver chip - CH9102X (or similar)
• Software selectable - Celsius / Fahrenheit
• Software selectable output format - TXT or CSV
• Changeable backlight level 5%...100%
• Changeable log interval – 1sec … 9999sec
• Integrated clock off-time battery type - CR1220
• Accepted SD Card types – SDHC, microSDHC
• SD Card file system - FAT32
• SD Card maximum size - 32Gb

3. What sensors type can I use?

You can use any modification of digital sensor type DHT22, AM2302 and AM2305 with 1wire data transferring protocol. Your digital sensor must have 3 wires – VCC, GND and DATA. Please be noticed that same sensor modification can have 4 wires. This 4 wires sensor is with i2c data transferring data and it NOT compatible with the data logger.

4. How much sd card memory is used to store measurement data?

With record interval 1sec, one year stored data will take only 1.2GB. For more info please download user manual.

User manual - google drive hyperlink

5. How do I use device menu?

On the right side of the device are 4 buttons – enter, select, increase +, decrease - . Each button had double functionality - quick press and long press. With these four buttons you can operate device menu.

• Quick press have a direct purpose.
• Long press ENTER button – entering to the calibration menu.
• Long press SELECT button – entering to the main menu.
• Long press INCREASE+ button – entering to the system information.
• Long press DECREASE- button – reboot the device.

6. Device setup calibration menu.

In this menu available four values for calibration:

• T1 temparature calibration value
• H1 humidity calibration value
• T2 temperature calibration value
• H2 humidity calibration value

These calibartion values are stored in eeprom memory.

7. Device setup changeable settings.

• Set time – user setup time.
• Set date – user setup date.
• Set measuring value – user setup temperature measuring in Celsius or Fahreheit
• Set logging interval – user setup measuring interval range. Value range from 1sec to 9999 sec, step 1 second.
• Set output log format – CSV or TXT.
• Set backlight level – user setup lcd display backlight level. Level range from 5% to 100%, step 5%.

Device settings are stored in eeprom memory.

8. Device system information menu page.

With this menu page device showing system information such as chip type, firmware version and volume, manufacturing date, uart speed, sd card info and device serial number.

9.How do I connect SD card?

On the top side of the device is located sd card slot.

10. What I will receive ordered this device?

You will receive:

• 1x 2ch Datalogger DHT22
• 2x DHT22 sensor

Please note: usb cable and sd card are NOT INCLUDED in this lot!

11. Information:

• User manual - google drive hyperlink
• Logging file example - google drive hyperlink