This TinyShield lets you measure temperature and humidity from the TinyDuino. Based around the Silicon Labs Si7020-A10 sensor, this allows for accurate temperature measurement (+- 0.4C) and precision relative humidity readings.

This TinyShield incorporates level shifters and a local power supply to ensure proper and safe operation over the entire TinyDuino operating voltage range up to 5V.

TECHNICAL DETAILS

Si7020-A10 Specs

Precision Relative Humidity Sensor
- +-4% RH, 0-80% RH
- 0 - 100% RH operating range
High Accuracy Temperature Sensor
- +-0.4C, -10 to +85C
Factory Calibrated
Integrated on-chip heater
Excellent long term stability

TinyDuino Power Requirements

Voltage: 3.0V - 5.5V
Current:
- 150uA (Active Mode).
- 60nA (Standby)
- Due to the low current, this board can be run using the TinyDuino coin cell option

Pins Used

A5/SCL - I2C Serial Clock line
A4/SDA - I2C Serial Data line

Dimensions

20mm x 20mm (.787 inches x .787 inches)
Max Height (from lower bottom TinyShield Connector to upper top TinyShield Connector): 5.11mm (0.201 inches)
Weight: 1 gram (.04 ounces)

NOTES

You can also use this shield without the TinyDuino – there are 0.1″ spaced connections for power, ground, and the two I2C signals along the side of the TinyShield to allow you to connect a different system. Warning: Revision 4 boards have a mistake on the silkscreen, the pin marked VCC is actually SCL, the pin marked SCL is actually SDA, and the pin marked SDA is actually VCC. If you connect this up the way it is marked you will not damage the board.
This sensor has a hole in the top of it for measuring humidity, care should be taken to not get debris in this opening.

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