Here’s what they do:
JP1 - Close this jumper with a solder blob to change the I2C address of the
BME280 sensor from 0x77 to 0x76.
JP2 - Close this jumper with a solder blob to change the I2C address of the
CCS811 sensor from 0x5B to 0x5A.
JP3 - Close the 0 half of this jumper with a solder blob to set the address of
the APDS-9301 sensor to 0x29. Close the 1 half of this jumper to set the
address to 0x49. If you accidentally bridge the entire jumper, the address
will be 0x29, but nothing bad will happen.
JP4 - Cut this trace to disable the onboard NTC thermistor used by the
CCS811 for temperature compensation. If you do this, you must add an
external NTC thermistor for the CCS811 to work properly.
JP5 - Cut the traces on this jumper to disable the pull-up resistors for the
I2C bus.
Optional, off-board Sensors
There are connections for five off-board sensors as well: wind speed and
direction, rainfall amount, temperature, and soil moisture.
Wind Speed and Direction
Coupled with SparkFun’s weather station, the wind speed and direction can
be measured by counting pulses per second and by measuring the
resistance of a discrete step potentiometer. The pins for these two functions
are connected to ESP32 Thing pins 14 (speed) and 35 (direction).
One tick per second corresponds to 1.492mph (2.40 kph) of wind speed.
Obviously, the orientation of the weather meter determines what the
resistance is for a given position. Sixteen positions are available and the
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