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Update README.md
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README.md
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README.md
@ -7,7 +7,29 @@ Coming soon...
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## Designs
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### SmartKnob View
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Premium SmartKnob experience. Under active development. Untested & unproven.
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Premium SmartKnob experience. Under active development.
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Not recommended for general use yet (mechanical and electrical revisions are planned).
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Requires advanced soldering experience to build - reflow and small-pitch SMT soldering are required.
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Features:
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- Powered by ESP32-PICO-V3-02 (Lilygo TMicro32 Plus module)
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- 240x240 round LCD, protected by 39.5mm watch glass on rotor
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- PCB flexure and strain gauges used for press detection (haptic feedback provided via the motor)
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- 8 side-firing RGB LEDs (SK6812-SIDE-A) illuminate ring around the knob
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- USB C (2.0) connector for 5V power and serial data/programming (CH340)
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- VEML7700 ambient light sensor for automatic backlight & LED intensity adjustment
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- Versatile back plate for mounting - use either 4x screws, or 2x 3M medium Command strips for mounting
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- Front cover snaps on for easy access
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#### Demo video
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<a href="https://www.youtube.com/watch?v=ip641WmY4pA">
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<img src="https://img.youtube.com/vi/ip641WmY4pA/maxresdefault.jpg" width="480" />
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</a>
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#### Exploded view
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@ -20,6 +42,7 @@ Premium SmartKnob experience. Under active development. Untested & unproven.
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<img src="https://smartknob-artifacts.s3.us-west-1.amazonaws.com/master/electronics/view_base-back-3d.png" width="300" />
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</a>
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Note: use white soldermask, for reflecting light from RGB LED ring around the knob.
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[Schematic](https://smartknob-artifacts.s3.us-west-1.amazonaws.com/master/electronics/view_base-schematic.pdf)
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@ -58,6 +81,19 @@ Planned for the future.
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## Component Info
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### Magnetic encoders
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#### MT6701 (MagnTek)
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Excellent sensor at a reasonable price - highly recommended. Less noisy than TLV493D, and more responsive (control loop is more stable) using SSI.
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- Lots of IO options - SSI, I2C, and ABZ - should offer good response latency
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- SSI includes CRC to validate data
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- No power-down or low-power options - may not be ideal for battery-powered devices
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- Not available from US distributors (Mouser, Digi-Key)
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[Datasheet](http://www.magntek.com.cn/upload/MT6701_Rev.1.5.pdf)
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[Ordering (LCSC)](https://lcsc.com/product-detail/Angle-Linear-Position-Sensors_Magn-Tek-MT6701CT-STD_C2856764.html)
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#### TLV493D (Infineon)
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A mediocre choice. Easy to prototype with using [Adafruit's QWIIC breakout board](https://www.adafruit.com/product/4366).
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@ -71,27 +107,15 @@ There is also apparently a known silicon issue that causes the internal ADC to s
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be detected by:
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- Frame Counter (FRM) counter stucks and does not increment anymore.
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In my experience testing 4 different Adafruit breakout boards, 2 of them (50%) regularly exhibit this lockup behavior within a minute or two of use.
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As of 2022-02-08, there is limited availability of this IC.
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In my experience testing 4 different Adafruit breakout boards, 2 of them (50%) regularly exhibit this lockup behavior within a minute or two of use. It is possible to detect and auto-reset (and there is code in the project to do so), but it is slow and may cause undesirable jumps/delays if the sensor locks up often.
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[Datasheet](https://www.mouser.com/datasheet/2/196/Infineon_TLV493D_A1B6_DataSheet_v01_10_EN-1227967.pdf)
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#### MT6701 (MagnTek)
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Very promising based on the datasheet and initial tests. Seems to be less noisy than TLV493D, and more responsive (control loop is more stable) using SSI.
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- Lots of IO options - SSI, I2C, and ABZ - should offer good response latency
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- SSI include CRC to validate data
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- No power-down or low-power options - may not be ideal for battery-powered devices
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- Not available from US distributors (Mouser, Digi-Key)
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[Datasheet](http://www.magntek.com.cn/upload/MT6701_Rev.1.5.pdf)
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[Ordering (LCSC)](https://lcsc.com/product-detail/Angle-Linear-Position-Sensors_Magn-Tek-MT6701CT-STD_C2856764.html)
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####
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### Motor drivers
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#### TMC6300-LA
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This is a relatively new IC and it's a perfect match! There generally aren't any other drivers (with integrated fets) that meet the requirements for the low-voltage and low-current motors used in this project.
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This is a relatively new IC and it's a perfect match! There generally aren't any other drivers (with integrated fets) that meet the requirements for the low-voltage and low-current motors used in this project (DRV8316 might work, but has not been tested).
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Highlights:
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- 2-11V DC motor supply input
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