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The main chip is GY-213V-HDC1080(Can use SHT21 HTU21D SI7021 chip to made the same sensor).This I2C digital humidity sensor is a fairly accurate and intelligent alternative to the much simpler Humidity and Temperature Sensor -SHT15 Breakouts It has a typical accuracy of ±4% with an operating range that's optimized from 10% to 80% RH. Operation outside this range is still possible - just the accuracy might drop a bit. The temperature output has a typical accuracy of ±0.2°C from -20~85°C.
TI has indicated that there's a 'settling' effect for the humidity and that you will need to re-hydrate the sensor once you receive it. To rehydrate it, place it in a location with 85% humidity for 24 hours or 60% humidity for 10 days.
Technical Parameters:
Humidity measuring range: 0-100%RH
Maximum power consumption: 2.7uW
Humidity accuracy range:10% RH to 95% RH
Measurement time: 50ms
10. Response time: 5s
RH: +/- 4% RH
RH: +/- 2% RH
Working humidity range: 0-100% RH
Features:
Temperature Accuracy ±0.2°C (typical)
14 Bit Measurement Resolution
Vin - this is the power pin. Unlike many sensors, this chip can be powered by 3-5VDC, so there is no voltage regulator on board.
3-5V OK
3-5V OK
These are pins you don't need to connect to unless you want to! RDY - This is the interrupt/'ready' pin from the HDC100x. The chip has some capability to 'alert' you when data is ready to be read from the sensor. We don't use this pin in our library but it's available if you need it! It is open collector so you need to use a pull-up resistor if you want to read signal from this pin. A0 A1 - These are the address select pins. Since you can only have one device with a given address on an i2c bus, there must be a way to adjust the address if you want to put more than one HDC100X on a shared i2c bus. The A0/A1 pins set the bottom 2 bits of the i2c address. There are pull-down resistors on the board so connect them to Vin to set the bits to '1'. They are read on power up, so de-power and re-power to reset the address.
1x Module Board
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