2:46 AM
(1) Senior Design Clothes Folding Machine - WashU 2017dec17
https://www.youtube.com/watch?v=OTIuf46fZ0g
(2) Automatic clothes folding machine - 2018jun22
https://www.youtube.com/watch?v=zsiOJq4oTwg
(3) ZS AF818 CNC Full Automatic edge folding machine for leather - 2019feb22
https://www.youtube.com/watch?v=i98uN4qWSEo
https://www.youtube.com/watch?v=OTIuf46fZ0g
(2) Automatic clothes folding machine - 2018jun22
https://www.youtube.com/watch?v=zsiOJq4oTwg
(3) ZS AF818 CNC Full Automatic edge folding machine for leather - 2019feb22
https://www.youtube.com/watch?v=i98uN4qWSEo
3:00 AM
3:30 AM
Pico MicroPython L298N DC motor driver and N20 DC gear encoder motor programming design notes, Part 1.
4:13 AM
I first move the abstraction level from L298N driver to N20 motor. So from now on I will work at the motor level, rather than driver level. Below is the function to move motor forward and backward at full speed.
def testN20V01(): # *** Move N20 motor at full speed for 2 seconds forward, 2 seconds backward *** printProgramName() print('Begin testN20V01(), ...') n20StopMotor(l298nEnblPinNum) # Setup/Config motor n20SetDirForward(l298nIn1PinNum, l298nIn2PinNum) n20MoveFullSpeed(l298nEnblPinNum) # move motor full speed, 4 seconds pause(fourSeconds) n20StopMotor(l298nEnblPinNum) n20SetDirBackward(l298nIn1PinNum, l298nIn2PinNum) # move motor backward, full speed, 4 seconds n20MoveFullSpeed(l298nEnblPinNum)
2 hours later…
6:09 AM
Suggestion to use a stronger motor. As I said earlier, we need a stronger motor to flip the flap. Yous with no reduction gear is too weak, mine even with gear is also too weak. So I searched my junk box to find a strong guy. I used it for my other Micky Mouse toy project, a cat food feeder. The motor is used to open a flap, so the cat food biscuits would fall to the bowl, ...
ChiHai Motor CHW4632-370 permanent magnetic worm reducer motor power off self-locking 6/12/24V (6mm shaft dia) - AliExpress US$7 ~ 11
https://www.aliexpress.com/item/32820642165.html?spm=a2g0o.seodetail.topbuy.1.5dbf66f4vsH3gT
https://www.aliexpress.com/item/32820642165.html?spm=a2g0o.seodetail.topbuy.1.5dbf66f4vsH3gT
This reminds me one of the ways to "sense" that the T-shirt folder flap has reached either of the two limiting positions, motor current suddenly jumping from 2A to over 5A. At these two positions the program would stop moving the motor. Another way is to use position sensors such as a Hall effect sensor.
1 hour later…
7:42 AM
5 hours later…
12:25 PM
Another closed loop feedback control signal is from the switching regulation PSU, eg LM2596 2A max PSU. For the T-shirt folder machine, if the flap is at either limiting position, the motor can no longer move, so will stall at this point, now the current will suddenly jump from about 2A to the stall current 5A. however, the short circuit current protection circuit of the LM2596 would take off, prevent damaging the PSU and motor.
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