frohr
Member

If I undestand well (not sure) I have to add capacitor and resistor between power of ADS / ADXL and GND = Capacitor will be connected between 5V and GND. Is that correct?

But why is it ok with PC and not ok with notebook? Another grounding of USB in those devices? But: I will start to use my device without USB cable - could you recommend me how to send array of 30000 floats bus...

If I connect signal generator to the connector instead ADXL the I have no noise.

I made simple pcb where is inserted Teensy 4.0 and ADS1256. Then I have wires to connector and to ADXL1005 eval board. ADS has 2.5V reference pin - I do not use it, I think it is somehov internaly (I hope). Anyway, If...

OK, I will check. I am looking for any information but nothing what I need... Main question is: Is possible send 30000 float values from Teensy 4.0 via bluetooth in a short time? Will it be the same like via serial?

Hi, I try now to use bluetooth instead serial. Maybe you can help me because I have stucked. I have now very similar Teensy code: #include <SoftwareSerial.h> SoftwareSerial mySerial(0, 1); // RX, TX char...

Hi, I am testing it with my app in Python. But I can see lot of noise: If I have connected signal generator, I have no problem with noise and no problem witth all range of frequencies from 0-15000Hz:

But ActualSPS (30005) I need from Teensy, right? And tehre I have buffer 30000. I can not use 30005 in Python because I receive only 30k samples. Or I can add to array in Python 5 items with zero value...

Removed mean - FFT seem ok: About frequency shift: "On T4.1, I get total time of 999825 us for 30000 samples. That means sample rate = 30000/0.999825 = 30005.25" Where I have to change sample rate to...

50Hz time: FFT 50Hz:

Here is time wave for 12kHz: Zoomed: If I understand well, I have to calculate average value of all samples and then deduct this average from every sample, right?

Great. I wil test it more. Just one question - any idea why is there peak at 0Hz? It is there for all frequencies. For 12kHz: Zoomed:

Seems OK, but what do you mean about signal 12kHz and FFT 14kHz? Sine 50Hz 0.1V Sine 12000Hz 0.1V FFT 14000Hz

I have signal generator JDS6600. I have sine wave, testing from 10-7400Hz for 15kSPS and from 10-14900Hz for 30kSPS. Connected to ADS by crocodile clips. 15kSPS - signal OK in all range. 30kSPS - signal "shifted" in...

Just for comparison: "Matt Bilski" code, 30k SPS: My code, 15kSPS (but does not work 30kSPS):

Yes, seems ok, but I am not sure if the wave / time signal is ok. I want to see nice sine wave but I have: And another question - is possible make differential reading from ADXL1005? (I have eval board) ...

I have this module:

How to verify that?

Yes, seems the same - time signal is visually the same and fft is the same. I measured time to read 30k samples = 999731 micros - the same for both SPI speeds. I think I need 1M us. void SAMPLE_ADC() { int...

I changed nothing for now - just SPI speed from 2500000 to 1950000 but the result seems the same. Then I use function read_Value() then I use: void SAMPLE_ADC() { for(int i=0;i <(BUFFER_SIZE); i++)...

I am testing https://github.com/mbilsky/TeensyADS1256 I have connected function generator (JDS6600). SPS30000, PGA64, 30k samples, + to AIN0 - to AIN1. It seems to be a bit noisy. For example for 14kHz I can see in...