DHT22 2 Click Board™

Product Code: MIKROE-2818

The DHT22 2 Click Board™ is used for measuring the environmental temperature and relative humidity. It uses the AM2322 sensor, with very accurate thermal and humidity measuring capabilities. It can use either 1-Wire or I2C protocol to communicate with the integrated circuit. Attributes like the ultra-small size, low-power consumption, signal transmission distance up to 20 meters, make this sensor the perfect choice for all kinds of applications that require measurement of the temperature and humidity. How Does The DHT22 2 Click Board™ Work? The DHT22 2 Click Board™ is based on the AM2322 sensor. This sensor contains humidity and temperature measurement elements, compensated and calibrated in the accurate calibration chamber. The calibration coefficient is saved in the OTP memory of an integrated MCU. The integrated MCU also provides I2C or 1-Wire interface, selectable by the onboard SMD jumper selectors. The operating voltage can also be selected by the onboard SMD jumper. Typical temperature accuracy is ±0.3°C, while relative humidity accuracy is 2% RH, with the resolution of 0.1 for both measured properties.

I2C/1-Wire interface is used to communicate with the host MCU, sending the measurement data every 2 seconds. Proprietary data collecting techniques are used to average the sampled values, after which the result is sent via the I2C/1-Wire bus. Specifications Type Temperature & humidity Applications Weather stations, HVAC systems, humidity regulators and so on On-board modules AM2322 sensor with very accurate thermal and humidity measuring capabilities Key Features Great measuring accuracy: ±0.3°C, ±2%RH at 25°C, ultra-small size, low power consumption, signal transmission distance up to 20 meters. Interface 1-Wire,I2C Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V or 5V Pinout diagram This table shows how the pinout on the DHT22 2 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 OW 1-wire NC 2 RST INT 15 NC NC 3 CS RX 14 NC NC 4 SCK TX 13 NC NC 5 MISO SCL 12 SCL I2C clock NC 6 MOSI SDA 11 SDA I2C data Power supply +3.3V 7 3.3V 5V 10 +5V Power supply Ground GND 8 GND GND 9 GND Ground DHT22 2 click maximum ratings Description Min Typ Max Unit Logic voltage level 3.3 5 5.5 V SCL clock frequency 100 kHz Measuring range (T) -40 +80 °C Measuring range (RH) 0% 99% RH Onboard settings and indicators Label Name Default Description JP1 OW/SCL Right Digital interface selection. Left position 1-Wire, right position I2C. JP2 OW/SDA Right Digital interface selection. Left position 1-Wire, right position I2C. JP3 LOGIC SEL Left Logic level voltage selection. Left position 3.3V, right position 5V. PWR Power LED - Power LED indicates that the click is powered on