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jlr91
Posts: 6
Hi,
I have a basic question.
When should I use a stepper (for which instrument in fact) and when a servo ?
I'd like to build a Cessna panel.
Regards
Jean-Luc
2020-01-31 19:03
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StephanHo
Moderator
From: EDDG, Germany
Posts: 1571
Supporter
Hi Jean-Luc,

whether you use a stepper or a servo depends on your skills and capabilities.

A servo basically only rotates in the range from 0 to 180 degrees, i.e. a semicircle. This range can be expanded with a gear reduction. There could also be a space problem because most servos are larger than the steppers.
It is often perceived as a disadvantage of the servos that they tend to shake and sometimes run restlessly.

Steppers cover the area of ​​360 degrees. You can also rotate 360 ​​degrees several times (compass, heading, etc.).
Steppers are very quiet and do not need a gear.
The 28BYJ-48 5V with the ULN2003 interface is popular and is used very frequently.
A stepper should not be supplied with power by the Mega module because they have a higher power requirement. It is therefore recommended to use an external power supply.

In terms of price, steppers are usually cheaper than servos. There are already cheap servos for 3 euros on ebay, but there is also the above-mentioned stepper for almost half.

If you want to know which gauges you use a stepper for, see this topic:

https://www.mobiflight.com/forum/message/3027.html

You can also use the forum search.
Grüße,
Stephan
2020-01-31 22:32
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jlr91
Posts: 6
Hi Stephan,
Thanks for your answer. That's exactly the info I was looking for.
I did a search before asking but got nothing about comparison.
regards,
Jean-Luc
2020-02-01 09:20
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VR-FlightSim
From: United Kingdom
Posts: 97
Supporter
Here's a comparison video "stepper vs servo" both running the same offset (engine RPM)

https://flic.kr/p/2hRpWYT

Jay
2020-02-05 16:14
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