Weighing scale for brewing espresso. Measures weight and times the brew. It can also calculate ratios.
License: GNU General Public License v3.0
Open Source Scale for Brewing Espresso.
More information can be found in the beautiful wiki.
🚧 The schematic and PCB are designed with CircuitMaker. The project can be found here.
| Name | Status | Description |
|---|---|---|
| main | active |
Main branch for developing with VSCode |
| unittest | stale |
Branch to test unit test framework and github actions. |
When pressing the shutdown button not long enough the scale locks up. You have to press it longer than a short moment, though. 🤷
When the button is pressed long enough the shutdown works.
The backlight cannot be enabled by the user.
The backlight should be enabled by pressing KEY0 for more than 2s.
The calibration coefficients are hard coded and compile time.
Add a calibration menu and procedure to perform the calibration by the user.
The documentation for the following topics has to be done:
The current filter is simple PT1 filter with a time constant of 0.5s.
The filter should be improved to settle faster and also give the derivative of the weight measurement to get the flow rate.
Use the same filter as used in OTP-15 oVaro.
The timer of the scale counts too slow.
The timer should count in 1s intervall.
The system task has to wait one systick less to increment the counter value.
The timing is included in the system task.
Add a separate task for timing with a schedule of 1Hz.
⇒ Change the structure of the task groups and use the variable TickPassed for the fast tasks.
The scale should have a GUI screen for changing the settings and performing the calibration. This requires the state machine to be extended as shown in the state diagram.
No calibration is applied, because with the current offset of the trimmer poti the scale reaches a accuracy of ±1g. Which is fine for now.
Since a linear calibration does not seem accurate enough, implement a advanced calibration with either a bilinear curve or a quadratic curve.
⇒ Further investigation on this topic will be necessary... 🤔
Add a welcome screen from where the user can decide what to do next as defined in the state diagram.
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