Hi all!
At first i want to say that im new to Arduino, so if i will say something wrong, dont get mad.
So, i would like to do simple (or not) mechanism with Arduino, when i power on my mechanism it needs to run a motor from car wipers at 100rpm, then after 5 minutes, motor would run at 200rpm, after another 5 minutes, motor would run at 300rpm. I would like to do that with an oled display when i can customize values above. And i need help with choosing parts; which Arduino? How to control motor RPM [A] changing after [B, C, D] minutes by [E] value? What i need to buy and how to write the code for it?
Thanks in advance
~Michael
Leave off the OLED for now and get something working with the fixed idea you expressed.
You can control the speed of a DC motor using PWM, available easily with analogWrite().
You will need a driver circuit that can handle the voltage and current of the motor you want to use.
What voltage and current does the motor need? For starting up, and for running at the highest speed you want?
You can also leave that out for the moment, as analogWrite() also does a good job of dimming an LED, so…
...wire up an LED and a series current limiting resistor and you can work on the code with no distractions which can be considered separately, later or before or your sister is helping and she'll do that part.
a7
Can You provide information about the honey extractor? I've seen such ones and might have some little knowledge.
The drums I've seen had a diameter of 1 meter and a height roughly the same. The inertia is huge! Such a drum You will never be able to turn using a wiper motor! That motor will get overheated and burn.
Give the physical dimensions of Your device and include the weight.
For real control, to a given RPM, a rotary encoder is required for feedback of the actual speed.
Indeed.
I should have said you can make a motor go faster and slower using PWM.
a7
This would be an engine from car wipers. 12v, 6/8A i guess would work nice, when i'll have one i'll measure what voltage and current it needs for highest speed i want.
I was thinking about menu [A,B,C,D,E] values customizable and showing rpm at main screen.
Hello emgru
Don´t forget to think about a suitable RPM sensor for your system.
My dad is doing the drum, my part is mechanism, that's why i started this discussion. It is 80cm diameter, wich will handle 40 frames (around 50kg) Im pretty sure it will work with a wiper motor, using a drive belt.
What is the target RPM of the rotating mass?
The 6 - 8 amps will by far not be enough to accelerate the drum up to the target RPM I'm afraid. Multiply that by some 5 to 10.
Try Your theory and tell us how it turned out. Measuring and watching the temperature of the motor would be good to avoid smoke signals.
Manual, visual controll using a pot and PWM would likely do as a beginning. I doubt the wiper motor will survive...
100-300 rpm, gear ratio 1:3, i was thinking about an car fan cooler engine if the wiper engine is too weak
Sure.
But we see many ppl here with a giant program (relatively speaking) with all kindsa nifty hardware and features.
That does not work even if it compiles, and the logic is so strewn about with all the other stuff that it becomes a headache to figure out what it is doing and why. Or what it is not doing and why not.
Which is why I always try to get the basic logic and timing accomplished, then I add things to that functioning base one at a time.
Those are both motors, not engines, but never mind.
What RPM can you get from a wiper motor? What torque can you get from a car fan cooler motor?
I don't know that either motor would be a solution so I too await the results of your experiments.
a7
When I look at plans for a "DIY honey extractor" I see the motor used to be AC with an ability to turn 150 to 200 RPM's and motor size is from 1/4 HP, for 2 frames to 3/4 HP for 4 to 6 frames.
I'd venture to say that a DC wiper motor is not up to the task.
Im sure, that cooler fan motor is okay, i saw extractors with these motors and they are working.
I calculated it, and got 65 N.m, its 350/400 watts motor, with current around 30 amps.
All i need to know is how to do the electronics. What modules to buy, how to wire it and make it work.
Well I don't see that anyone has mention pololu.com, a place to start for motor drivers.
At 10s of amps and never having rolled your own, you will get along better with a prebuilt unit.
has some good basic info and a wide selection of products to help.
a7
FTI: Engines run on fuel. Motors run on electricity.
The error in trying to use automotive motors in this project is COOLING. Neither of the motors being considered have internal cooling fans!
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