It's summer and you're sweating and your hair's all frizzy and all you really want to know is why the weatherman said this morning that today's relative humidity would max out at a perfectly reasonable 52% when it feels more like 77%. Enter the HDC1008 Temperature + Humidity Sensor - the best way to prove the weatherman wrong!
This I2C digital humidity sensor is a fairly accurate and intelligent alternative to the much simpler Humidity and Temperature Sensor - SHT15 Breakout 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.
The HDC1008 sensor chip has 2 address-select pins, so you can have up to 4 shared on a single I2C bus. It's also 3-5V power and logic safe so you don't need any level shifters or regulators to use with a 5V or 3V microcontroller.
Such a lovely chip, but only available in a tiny BGA package. So we spun up a breakout board with the chip and some extra passive components to make it easy to use. Each order comes with one fully assembled and tested PCB breakout and a small piece of header. You'll need to solder the header onto the PCB but it's fairly easy and takes only a few minutes even for a beginner.
- Dimensions: 18mm x 15mm x 2mm / 0.7" x 0.6" x 0.1"
- Weight: 1.0g
- Power: 3-5VDC
- Logic: 3-5VDC
- Datasheet with more specifications!
- Uses I2C address 0x40, 0x41, 0x42 or 0x43
Temperature and Humidity Sensor Breakout Board - HDC1008 
- Brand: Adafruit
- Product Code: ADA-2635
- Reward Points: 8
- Availability: 4
- Ex Tax: £8.45
- Price in reward points: 100