Contributors:
jimblom Powering the ThingThe Thing provides for two methods of power delivery: USB or LiPo. The USB connector on the Thing is of the Micro-B variety. A micro-B cable plugged into either a computer USB port or a 5V USB Wall Wart can power the Thing.
Any of our single-cell LiPo batteries will also work to power the Thing -- they all have the same 2-pin JST connector.
Add an 850mAh LiPo and an LSM9DS0 9DoF IMU to the Thing, to create an IoT motion sensor.If both USB and LiPo are connected to the Thing, it'll take power from the USB port and charge the LiPo battery at up to 500mA.
Electrical CharacteristicsThe ESP8266's maximum voltage is 3.6V, so the Thing has an onboard 3.3V regulator to deliver a safe, consistent voltage to the IC. That means the ESP8266's I/O pins also run at 3.3V, you'll need to level shift any 5V signals running into the IC.
The input to this regulator can either be delivered by USB, LiPo battery, or through the VIN pin.
Max Input Voltage: If you supply power to the board through the VIN, make sure the voltage does not exceed
6V. That's the maximum input voltage of the
AP2112K-3.3V regulatorthe board uses.
Alternatively, if you have an external, regulated, supply you'd like to deliver directly to the ESP8266, you can supply that voltage through the 3V3 pin (on the I2C header). While this voltage doesn't have to be 3.3V, it must be within the range of 1.7-3.6V.
Current RatingsOn average, the Thing pulls about 80mA. WiFi transmits and receives can momentarily increase that draw. Here's a table, transcribed from the ESP8266 datasheet, with some of the more common current characteristics.
Parameter Typical Max Unit Transmit 802.11b (1 Mbps) 215 mA Transmit 802.11b (11 Mbps) 197 mA Transmit 802.11g (54 Mbps) 145 mA Transmit 802.11n 135 mA Receive 802.11b 60 mA Receive 802.11g 60 mA Receive 802.11n 62 mA Standby 0.9 mA Deep Sleep 10 µA Maximum I/O Pin Drive Capability 12 mAIf your application requires maximum battery life, you'll likely need to make liberal use of the ESP8266's deep sleep functionality. That'll be covered later in this tutorial.
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