1958 Turntable from the Black Forest - 6: Turntable Speed Sensor design

RE: 1958 Turntable from the Black Forest - 6: Turntable Speed Sensor design

Jan Cumps — Wed, 15 Apr 2015 22:19:01 GMT

Baked in the pizza oven. I had to rework the transistor with hot air because it wandered around a bit.

[View:/resized-image/__size/572x429/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-29e7d34d-b09c-4faf-81a3-c0fcecb35a44/contentimage_5F00_179246.jpg:572:429]

RE: 1958 Turntable from the Black Forest - 6: Turntable Speed Sensor design

Jan Cumps — Wed, 15 Apr 2015 12:46:57 GMT

teaser [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-29e7d34d-b09c-4faf-81a3-c0fcecb35a44/5670.contentimage_5F00_1.png:16:16]

[View:/resized-image/__size/620x465/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-29e7d34d-b09c-4faf-81a3-c0fcecb35a44/4274.contentimage_5F00_179245.jpg:620:465]

RE: 1958 Turntable from the Black Forest - 6: Turntable Speed Sensor design

Jan Cumps — Sun, 29 Mar 2015 00:06:55 GMT

The control firmware is finished. The table is now running at a constant speed with feedback regulation. I've added a slow - ok - fast LED display for visual feedback on the regulation.

The 8 seconds video below shows the regulation with a little hysteresis (to make the video flashy [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-29e7d34d-b09c-4faf-81a3-c0fcecb35a44/contentimage_5F00_1.png:16:16] - with optimized hysteresis the green led is on almost always).

[View:https://www.youtube.com/watch?v=t4hyU_gUEBs:520:333]

RE: 1958 Turntable from the Black Forest - 6: Turntable Speed Sensor design

DAB — Sat, 28 Mar 2015 21:41:44 GMT

Nice update.

I look forward to seeing the final boards.

DAB

RE: 1958 Turntable from the Black Forest - 6: Turntable Speed Sensor design

Jan Cumps — Sat, 28 Mar 2015 17:22:31 GMT

I've added a capture of the sensor signal before and after the amplifier for comparison of the slopes.

[View:/resized-image/__size/320x234/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-29e7d34d-b09c-4faf-81a3-c0fcecb35a44/contentimage_5F00_179244.jpg:320:234]

RE: 1958 Turntable from the Black Forest - 6: Turntable Speed Sensor design

Workshopshed — Sat, 28 Mar 2015 13:20:44 GMT

Great stuff, good practice to have that simple amplifier as close to the sensors and possible so putting it all on a PCB is a good idea.