power.md

layout	title	permalink	sequence	power
power	Power	/power	6	tree components calculation source battery_life charging_duration charging_instruction true true true <code>380mAh</code> LiPo battery 5 days 5 hours Plug in the USB cable to charge. <code>Yellow</code> LED will be on while it is charging.

Power consumption of main components

Chip #	Chip	Operating Voltage	Advertising mode (152.5ms)	Transmission mode
nRF52832	BLE + MCU	1.7v to 3.3v	60 µA	216 µA
VEML6075	UV Sensor	1.7V to 3.6V		480uA at 1.8V

Power calculation

Advertising Mode

From online power profiler

• Chip nRF52832
• Voltage 3.3V
• Radio TX Power 0dBm
• Role: Advertising (Connectable)
• TX payload (Byte) 0 byte
• Advertising interval (ms): 152.5 ms as recommended in Apple developer guide
• 120mAh battery capacity

Transmission Mode

From online power profiler

• Voltage 3.3V
• Role: Connection (peripheral)
• 3 byte TX payload
• Connection interval (ms): 1000 ms

Summary

• If transmitting 100% of the time: ~781 days
• If advertising 100% of the time: ~83 days
• If CPU running 100% of the time: ~12.5 hours

Other potential batteries

Name	Capacity	Voltage	Dimension	Buy from
CR2450	120mAh	3.6V	4cm x 2cm x 2cm	AliExpress
LiPo	380mAh	3.7V	37mm x 19mm x 8mm	AliExpress