Powering with an external power source
The devices can be powered by a battery or other external power source.
Be sure to connect the positive lead of the power supply to VIN, and ground to GND.
When powering via VIN:
- The input voltage must be between 3.4V and 5.5V.
When powering via 3V3:
- The input voltage must be exactly 3V3, ripple free and from a supply capable of sourcing at least 500mA of current.
The battery connector for the expansion board is a JST SH 2P variant. The expansion board exposes the male connector and an external battery should use a female adapter in order to connect and power the expansion board.
The GPIO pins of the modules are NOT 5V tolerant, connecting them to voltages higher than 3.3V might cause irreparable damage to the device.
Static electricity can damage components on the device and may destroy them. If there is a lot of static electricity in the area (e.g. dry and cold climates), take extra care not to shock the device. If the device came in a ESD bag (Silver packaging), the best way to store and carry the device is inside this bag as it will be protected against static discharges.