How to convert raw values to voltage?
For TGAT-based hardware devices (such as TGAT, TGAM, MindSet, MindWave, and MindWave Mobile), the formula for converting raw values to voltage is:
[ rawValue * (1.8/4096) ] / 2000
This is due to a 2000 gain, 4096 value range, and 1.8V input voltage. The unit is V.
The ECG/EKG raw values from CardioChip/BMD10X-based devices must use following conversion:
(rawValue * 18.3) / 128.0
This is due to a 128 gain, 16 bit digital signal. The unit is uV.
Please note the gain on actual hardware may be slightly off from 2000x (maybe +/- 5%?), but unless you need to make ultra-sensitive measurements for some reason, that formula should be good enough.
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