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Realtime Technologies Ltd Shimmer User Manual
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53
Average Battery Life (hh:mm)
Accel (low noise)
Battery
Accel (low noise)
Battery
Accel (wide range)
Gyro
Mag (LSM303DLHC)
Battery.
Table 6-2 Shimmer3 Battery Life Estimation Table (LogAndStream – Bluetooth only)
Table 6-1 and Table 6-2 outline some example battery life estimation values for data capture,
derived from laboratory testing, using SDLog and LogAndStream (with Bluetooth streaming only),
respectively. The tables can also be used to estimate the battery life for a configuration not listed.
Note that users might experience some variation in battery life duration – this being dependent
upon the number of charge cycles a battery has undergone in its lifetime.
The Shimmer IDs, Shimmer APIs and software applications provide calibrated data, as well as raw
data. If you are developing a solution that does not avail of those options, you will need to calibrate
your raw ADC channel values to obtain a meaningful battery voltage reading.
Table 6-3 Battery Capacity based on Battery Voltage
Equation 1, below, defines how to convert the raw battery measurement values to Volts. Equation 2
calculates the battery voltage by multiplying the calibrated voltage output by two (required due to
use of voltage divider in hardware; contact Shimmer support if further information is required).
Equation 1
where offset = 0, Vref=3V, gain = 1.
Equation 2
In order to estimate the remaining battery capacity you can use Table 6-3 which has been derived
from information provided by the battery manufacturer. Note that the number of charge cycles a
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