Comments

• For noise reduction you don't necessarily need a wireless connection, just an electric isolation between the ADC board and your PC. That can also be achieved with opto-couplers or digital isolators (TI, ADI). The OpenBCI kit includes everything you…

  in Adding WiFi, faster BT, and other connections for v4? Comment by ferdinand March 2015
• I've run an ADS1298 at 8 kHz over USB using a Teensy 3.1. The bottleneck with that system was the way SPI is implemented on the Teensy. I've always wanted to give DMA a try, but I haven't had time for that, yet. These days I've been looking into co…

  in Adding WiFi, faster BT, and other connections for v4? Comment by ferdinand March 2015
• I gave the device away and I didn't measure it before. I'll keep you posted when I come around to building a second one.

  in Teensy based ADS1298 EMG acquisition board Comment by ferdinand December 2014
• Hi Martin, so you want to use the lead-off detection mode to measure the impedances of your electrodes, right? In that case you should be fine with just one BIAS connected. Regarding the bias I suggest you take a look at page 53, figure 51. Basica…

  in Multiple device setup and bias Comment by ferdinand September 2014
• Hey Martin, you can try to connect all your ADS1299s to one SPI bus but give each it's own CS pin on your micro. That way you can access them separately. Ferdinand

  in Multiple device setup and bias Comment by ferdinand September 2014
• The circuit board for the BTLE based EMG acquisition system. You can see a picture of my circuit right above. As for the report you can either read it online here or download it in PDF format from here. I don't know a lot about biopotential measure…

  in Teensy based ADS1298 EMG acquisition board Comment by ferdinand August 2014
• Gyorgy, let's assume you use the integrated 2.4 V reference, which gives you a full-scale input of 4.8 Vp-p (+-2.4 V). Setting the gain to 24x results in full-scale of 200 mVp-p. Now the LSB is approx. 12 nV. (200 mVp-p / 2^24). An input of 10 uVp-…

  in Where Are the High Gain Amps? Comment by ferdinand August 2014
• Actually the ADS1299 integrates the pre-amps. Each channel has one. The gain is programmable and goes up to 24x. Also its high resolution of 24-bit means you can still see signals much, much smaller than full-scale. Ferdinand

  in Where Are the High Gain Amps? Comment by ferdinand August 2014
• What were the changes you made to the SPI functions? If you're using the ADS1299 library from OpenBCI's Github be aware that it contains platform specific code and probably won't work with anything but the Due. However it's easy to convert it to use…

  in Software ADS1299 V2 Comment by ferdinand August 2014