Dankdryer improvements

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* We're ditching the Sparkfun NAU7802 breakout board, so we'll need add 2.2kΩ pullups on both I2C lines, 0.1µF and 1µF capacitors on VDDA, and 47Ω resistors on VNN1N and VNN1P with a 0.1µF bypass capacitor across them. See the [https://cdn.sparkfun.com/assets/6/a/5/9/d/Qwiic_Scale.pdf schematic]:

[[File:SparkFun-NAU7802.png]]

==Thoughts==

* Rather than mounting the RC522 directly onto the bottom of the top chamber, we print a short mount for it (building the mount into the hotbox would make it very difficult to print). This reduces the heat directly transferred to the RC522, without adding new connectors. The necessary screw holes into the bottom of the chamber already exist.

* I cut out chunks from the eight "fat corners" of the hotbox. I'd like to make these siting areas for dessicants. This <i>added</i> weight, presumably due to more walls vs sparse infill, so I changed it back.

* I experimented with adding a kinda inverted eggholder (actually just a bunch of inverted frustra) to the underside of the bottom chamber, in the hope of eliminating warping. It didn't really pan out (a good number detached from the build plate), and you need defeat warping for the top chamber anyway, so I removed them.

* I'm experimenting with a [https://en.wikipedia.org/wiki/Hypoid_gearboxes hypoid gear] to replace the less efficient [https://en.wikipedia.org/wiki/Worm_drive worm drive], and also hoping to reduce the choppiness of the platter rotation.

Dankdryer improvements: Difference between revisions

Dank (talk | contribs)

@@ Line 16: / Line 16: @@
 * We're ditching the Sparkfun NAU7802 breakout board, so we'll need add 2.2kΩ pullups on both I2C lines, 0.1µF and 1µF capacitors on VDDA, and 47Ω resistors on VNN1N and VNN1P with a 0.1µF bypass capacitor across them. See the [https://cdn.sparkfun.com/assets/6/a/5/9/d/Qwiic_Scale.pdf schematic]:
 [[File:SparkFun-NAU7802.png]]
+==Thoughts==
+* Rather than mounting the RC522 directly onto the bottom of the top chamber, we print a short mount for it (building the mount into the hotbox would make it very difficult to print). This reduces the heat directly transferred to the RC522, without adding new connectors. The necessary screw holes into the bottom of the chamber already exist.
+* I cut out chunks from the eight "fat corners" of the hotbox. I'd like to make these siting areas for dessicants. This <i>added</i> weight, presumably due to more walls vs sparse infill, so I changed it back.
+* I experimented with adding a kinda inverted eggholder (actually just a bunch of inverted frustra) to the underside of the bottom chamber, in the hope of eliminating warping. It didn't really pan out (a good number detached from the build plate), and you need defeat warping for the top chamber anyway, so I removed them.
+* I'm experimenting with a [https://en.wikipedia.org/wiki/Hypoid_gearboxes hypoid gear] to replace the less efficient [https://en.wikipedia.org/wiki/Worm_drive worm drive], and also hoping to reduce the choppiness of the platter rotation.