Extra GPIOs can be found on connector P4. In addition to P4, some of the GPIOs are available on connectors P5-P8.
For more information, see Connector pinouts.
These connectors are compatible with the Grove system from Seeed. P5 and P7 are connected to the same I2C bus as the low-power accelerometer, and only I2C devices should be connected to these connectors. P6 has two analog/digital I/Os, and P8 has one.
Figure 1. Thingy external connectors
Figure 2. Interface connectors
