You are reading a single comment by @Gordon and its replies. Click here to read the full conversation.
  • Hi, There are actually some quite polished EMG sensors if you need them, like this one:

    But to answer your questions:

    1. It totally depends on the size of the battery. A reasonably sized cell phone battery might be 2500mAh I think, and with Espruino itself running a lot of the time grabbing 1kHz data you'd be looking at maximum 30mA. So from that point of view it's 30 hours - however I'm not really sure on the power usage when sending over WiFi.

    I think it's save to say that with a 3 x 3 x 1 inch battery pack you'd be totally safe though, and you could probably get away with a lot less.

    1. Yes, you could definitely do some analysis. The JS code isn't very fast for ploughing though data, but there are things like built-in FFT, so you could run the data through that and pick out potential frequencies of interest very easily. There's also compiled JS code or the ability to just write some C code if you had to do some very heavy analysis.

    2. I think the WiFi would be fine - the other option is something like Puck.js. If you could cut down on the amount of data sent (for example doing an FFT and sending only some parts of it) then it could be a definitely option and is much smaller. It's very likely that one battery would last you well over a night - although it depends on how much power the EMG draws


Avatar for Gordon @Gordon started