Last Updated on January 9, 2023 by pg@petergamma.org
If we compare costs for single channel EEG devices on Aliexpress to 8 channel EEG modules on Aliexpress, they seem to be linked to each other. To buy 8 separate single EEG modules or an 8 channel EEG module does not matter so much, if we look at the costs.
We saw, that there are instructions how to connect an DF Robot optical heart rate sensor to an ESP 32 modules:
There are instructions, how to connect ESP 32 modules to Home Assistant Home Assistant and InfluxDB are our preferred platforms. If it is possible to connect an optical heart rate monitor to an ESP 32 module, then we should also be able to connect the ESP 32 module with the OHR to Home Assistant.
If this is possible, we can do the same with EEG modules. We saw papers with instructions, in which this has been done already.
After all we studied, we think it is worth to study the modules which we introduced on our journal in more detail, especially the ones which seem to be easily to be connected to Home Assistant and/or InfluxDB. This might cost us some time. But we think it is a solution which has a future. Costs for individual components drop everywhere, costs for complete solutions often stay high until these devices die.
But still, if we buy 8 EEG modules separately, we need an extra A/D converter for each EEG module. An 16 bit A/D converter costs only 2 USD, but we need to solder it to every EEG module.
I principle, we can have this today already. But we need to solder A/D converter to each sensor, which is hand work and time consuming. But on the long term, it is obvious, that new sensors will be developed which can easily be connected to InfluxDB by an interface which is user friendly.