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I am considering to switch from the digital encoders to analog one (e.g. https://www.mouser.de/ProductDetail/Alpha-Taiwan/RV142FPF-40B1-15F-0B20K-004?qs=XeJtXLiO41TzHkmiDnL8fQ%3D%3D). Are those supported? I was looking for input_params/count mode to configure it. |
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Replies: 2 comments 4 replies
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No, that won't work—you'd need two analog inputs and some trigonometry to calculate the position. High-resolution optical encoders usually provide two sinusoidal signals shifted by 90°, and it's common to use intermediary electronics to convert these signals into high-resolution incremental outputs. |
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The signals are triangles. The encoders are used in this teensy project, just FYI |
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Yes, I saw that they are triangular. But you can still use the sinusoidal formula alpha = atan2(A,B) to calculate an angle. Depending on your accuracy requirement you might need to do a lookup to correct for nonlinearities due to the triangular shape. Do you need the higher resolution? There also are simple mechnical encoders with no detents ad a rather high resolution. |
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I currently have EC11 digital encoders with detents and 30 ticks per rotation and those are way to coarse (I know that I can open them to remove the disc that causes the detents). |
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You get encoders without detents from the usual suspects. E.g. Alps, Bourns.. If you want better quality and even higher resolution you should look for oil damped optical encoders. IIRC Bourns has them. Be prepared to pay something in the 30USD range for those. https://bourns.com/products/encoders/optical-encoders |
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I've ordered the dual wiper potentiometers now and will try them. They are ~4.50€ per piece. I'll also check out the no-detent once, in case I am not happy with the Alpha potentiometers. |
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You get encoders without detents from the usual suspects. E.g. Alps, Bourns..
Without detents you can set the count mode of those encoders to FULL which would give you 4 times the resolution. Countmode FULL would still guarantee to settle at the correct position but it will count up and down a few counts during the bouncing time. If you only use them to adjust some settings like e.g. volume this shouldn't be a problem.
If you want better quality and even higher resolution you should look for oil damped optical encoders. IIRC Bourns has them. Be prepared to pay something in the 30USD range for those. https://bourns.com/products/encoders/optical-encoders