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Post: I finally tested my ADCDifferential boards. After setting i2c bus speed to 1Mhz as you suggested and with updated ver of your code (demo-speedtestthreaded.py) I have 222.54 Sps @12bit. So can't see actually your 434 Hz. Hence for all 8 channels that would be about 28 Hz. Now I got 32 Channels across 4 ADCDifferentialPi boards. What I did next is created py script (without threads in python) for each ADC -- 8 scripts in total, each for certain 4 channels corresponding to each ADC. When run them simultaneously I get about 42 Hz per each ADC and since they seemingly start and stop almost at the same time, that should do 42 x 32ch = 1344 Sps ? i used pi4 this time. Can see about 40 % cpu load for your demo_threaded (8 channels only) and about 6-7% per process (so again about 48-56% cpu in total) for my multiprocess approach (8 proc x 4 chan). [pre][code]pi@adc-raspi4:~/ADC/ABElectronics_Python_Libraries/ADCDifferentialPi/demos $ clear; ./continious_1A.py & ./continious_1B.py & ./continious_2A.py & ./continious_2B.py & ./continious_3A.py & ./continious_3B.py & ./continious_4A.py & ./continious_4B.py & [1] 1237 [2] 1238 [3] 1239 [4] 1240 [5] 1241 [6] 1242 [7] 1243 [8] 1244 pi@adc-raspi4:~/ADC/ABElectronics_Python_Libraries/ADCDifferentialPi/demos $ 200 samples in 4.175 seconds on 4 channels of board 2.2 47.902 samples per second 200 samples in 4.561 seconds on 4 channels of board 3.2 43.852 samples per second 200 samples in 4.638 seconds on 4 channels of board 3.1 43.124 samples per second 200 samples in 4.648 seconds on 4 channels of board 1.1 43.026 samples per second 200 samples in 4.653 seconds on 4 channels of board 4.1 42.983 samples per second 200 samples in 4.694 seconds on 4 channels of board 2.1 42.604 samples per second 200 samples in 4.696 seconds on 4 channels of board 1.2 42.591 samples per second 200 samples in 4.716 seconds on 4 channels of board 4.2 42.410 samples per second [1] Done ./continious_1A.py [2] Done ./continious_1B.py [3] Done ./continious_2A.py [4] Done ./continious_2B.py [5] Done ./continious_3A.py [6] Done ./continious_3B.py [7]- Done ./continious_4A.py [8]+ Done ./continious_4B.py pi@adc-raspi4:~/ADC/ABElectronics_Python_Libraries/ADCDifferentialPi/demos $ [/code][/pre] ... I think its time for me to switch to C and MPI... (1 MPI process per ADC I guess) Alex