A Clock Idea
I have two ideas with this clock:
Make a real simple clock, no other hardware needed (other than the electronics).
Show how IT can interact and improve mechanical devices.
The motor I got from Adafruit: https://www.adafruit.com/product/858, has 32 steps and a reduction ratio of 1/16.032.
At first, it does not look like a good choice for a clock, however IT technology can give the illusion of a perfect working motor.
32 steps and the ratio of 1/16.032 gives 513.034 steps per shaft revolution, divided by 60, that is 8.551 steps/second, or per minute, depending on the set up.
A stepper motor can only move an integer number of steps.
The program will decide if it will be 8 or 9.
The human eye will not see the difference!
Here is the link for the program:
iframe src="https://create.arduino.cc/editor/jaconline/3bf4d5f0-314d-42f8-97cc-338978bbc35c/preview?embed" frameborder="0"
And for the 1/64 motor:
iframe src="https://create.arduino.cc/editor/jaconline/82345395-feea-4d60-89e3-76227200757a/preview?embed" frameborder="0"
I also included a program for the same motor with a 1/64 ratio that is very easy to find on Ebay and other places.
The Arduino time keeping is not that great, depending on the board, I got a few minutes, up to 20 minutes variation per week.
I see it more as a learning experience.
Please comment if you feel like, or want to add it.
black sand silver
Making the clock
2 mini breadboards: https://www.adafruit.com/product/65
1 Arduino Nano or similar
1 Stepper Motor: https://www.adafruit.com/product/858
1 L293D IC: https://www.adafruit.com/product/807
Wires, 22AWG size
3D printed parts
I printed all the parts in PLA, with a 0.2 mm layer setting and 20% infill.
The only one tricky part is the gear 8, make sure you have a good bed adhesion.
Check that the gear and hand spins freely onto the face
Check that the gear spins on the mid frame
Assemble the screws, don’t mix them out, there is 2 half’s that need to stay together
The thread is a metric M 8
Then the motor and the 8 teeth gear
Details of the stepper motor:
Find more detail about it here:
Notice the 4 pins to connect the stepper motor to the breadboard.
Detail of motor, frame and gears
Notice the notch in the screw to allow room for the gear.
Don’t forget the holder for the boards at the bottom.
Another front view:
Completed mid-frame with motor, gear, electronics and back frame.
Notice that the motor does not need screws for holding it in place.
The front frame will hold everything in place.
Completed front-frame with gear and hand.
I printed the Hands and front nuts in a contrasting color.
The layout is similar to this: