python to control the stepmotor nema11

#finally it works! the wait time has to be finetuned to prevent the wobbling import RPi.GPIO as GPIO from RpiMotorLib import RpiMotorLib import time ################################ # RPi and Motor Pre-allocations ################################ # #define GPIO pins GpioPins=[21,22,23,24] # Declare a instance of class pass GPIO pins numbers and the motor type #mymotortest = RpiMotorLib.A4988Nema(direction, step, (21,21,21), "DRV8825") mymotortest = RpiMotorLib.BYJMotor("Mymotorone", "Nema") #mymotortest = RpiMotorLib.A4988Nema(direction, step, (21,21,21), "A4948") for i in range(5): time.sleep(1) mymotortest.motor_run(GpioPins, 0.0002, 1600, True, False, "full", .05)#pins, wait, steps, ccwise, verbose, steptype,inidelay time.sleep(1) mymotortest.motor_run(GpioPins, 0.0003, 1600, False, False, "full", .05)#pins, wait, steps, ccwise, verbose, steptype,inidelay GPIO.cleanup() # clear GPIO allocations after run

open image sequence with filter of more than one criteria

It took some effort, but I figure out the code should be: File name contains: (.*_F_.*tif) This means there is a "_F" in file name and the type of images is tif

3d mouse brain and skull model

Very nice 3d model: https://www.thingiverse.com/thing:3079327 This is how to make it smaller in file size so it can be imported to Tinkercad https://3dtomorrow.com/2019/07/17/how-to-reduce-file-size-in-meshmixer/

To convert 2-column vectors to 5 column vectors for comparison of grouped data

target=half_decay; grp=1:5; grouplength=ones(1,5); for i=1:5 grouplength(i)=length(find(target(:,2)==i)); end largest_groupnumber=max(grouplength); finalmatrix=NaN(largest_groupnumber,5); for ii=1:5 for iii=1:grouplength(ii) aa=target(find(target(:,2)==ii)); finalmatrix(iii,ii)=aa(iii); end end

Language tips: dire

There is a burning need to develope effective therapeutics toward... : Burning to "dire"

Add arrays to a structure

Num2cell is a useful function. The important part is that it could convert an array (m x n) to scalar array (y x 1) so you could add this to a structure. aa=table2struct(readtable((fullfile(filePath0,'curve','params',file0(1).name)))); %This is the structure you want to add new values to file1=dir(fullfile(filePath0,'ROI_dark*.mat')); dark_files=load(fullfile(filePath0,file1(1).name),'Intensity','dff0'); %Then you got two variables, both are two dimensional array. To add them, you have to first convert them into cell: cc=num2cell(dark_files.Intensity,1); %Then add them: [aa.dark_Intensity]=cc{:};

low cost microscopes

1. smart design https://www.osapublishing.org/DirectPDFAccess/73B7846B-A422-B22A-AA38B1E6131DE5F9_429869/boe-11-5-2447.pdf?da=1&id=429869&seq=0&mobile=no 2. not fancy https://www.instructables.com/ARPM-Another-raspberry-pi-microscope-made-from-Ple/ control of motion (for adujustment of focus): https://www.robotshop.com/community/forum/t/retracting-linear-actuator-with-raspberry-pi/43024/6 Since you want to control the speed and the position of the actuator, I would recommend using a linear actuator including a potentiometer like this one: https://www.robotshop.com/en/l16-linear-actuator-351-50mm-12v-w--potentiometer-feedback.html 89 This will allow you to track the position of the actuator. Note that you will need a microcontroller to read the value of the potentiometer. To control the speed of the actuator I would recommend any regular DC motor driver depending on the specifications of the actuator.