The I2C sensors are all on i2cAB.
Use this setting for i2C clock speed hardware.i2cAB.configure(CLOCK_SPEED_400_KHZ);
By default the tempHumid Sensor takes the max number of samples, to average. So 256 for temp and 512 for humidity.
The imp goes into deep sleep when after it takes some sensor readings. The wake pin is pinW. The accelerometer is setup to generate an interrupt when it recognizes a doubleClick.
There are two LEDs on the environmental sensor, a green LED and a blue LED. Both are active low. The blue LED is on pinP. The green LED is on pinU.
There is a user configuration page hosted by the agent. Currently, the device only retrieves new configurations on power cycle. The Imp Explorers need about 10 seconds unpowered for successful power cycling.