more rp2040 stuff

extensions/platformio/HX711_read/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

extensions/platformio/HX711_read/.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

extensions/platformio/HX711_read/include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the convention is to give header files names that end with `.h'.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

extensions/platformio/HX711_read/lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into the executable file.
+
+The source code of each library should be placed in a separate directory
+("lib/your_library_name/[Code]").
+
+For example, see the structure of the following example libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Example contents of `src/main.c` using Foo and Bar:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+The PlatformIO Library Dependency Finder will find automatically dependent
+libraries by scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

extensions/platformio/HX711_read/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:waveshare_rp2040_zero]
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git
+board = waveshare_rp2040_zero
+framework = arduino
+monitor_speed = 115200
+lib_deps = 
+    https://github.com/Chris--A/Keypad
+    bogde/HX711@^0.7.5

extensions/platformio/HX711_read/src/main.cpp

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+#include <Arduino.h>
+#include "HX711.h"
+
+const int LOADCELL_DOUT_PIN = 2;
+const int LOADCELL_SCK_PIN = 3;
+
+HX711 scale;
+
+float smoothedWeight = 0.0;
+float alpha = 0.3; 
+float calibration_factor = 111.17; 
+float known_weight = 796.0; 
+
+// Stability Lock Variables
+float lastDisplayedWeight = 0.0;
+const float STABILITY_THRESHOLD = 0.5;
+
+void calibrateScale() {
+    Serial.println("--- Calibration Mode ---");
+    Serial.println("1. Clear scale, type 't' to tare.");
+    Serial.print("2. Place "); Serial.print(known_weight); Serial.println("g weight.");
+    Serial.println("3. Type 'c' to confirm weight.");
+    
+    while (true) {
+        if (Serial.available()) {
+            char c = Serial.read();
+            if (c == 't') {
+                scale.tare();
+                Serial.println("Tared! Place weight and type 'c'...");
+            } else if (c == 'c') {
+                long reading = scale.get_value(15); 
+                calibration_factor = (float)reading / known_weight;
+                scale.set_scale(calibration_factor);
+                Serial.print("New Factor: "); Serial.println(calibration_factor);
+                Serial.println("Calibration Done! Exiting mode.");
+                break;
+            }
+        }
+    }
+}
+
+void setup() {
+    Serial.begin(115200);
+    scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
+    scale.set_gain(128); 
+    scale.set_scale(calibration_factor);
+    scale.tare();
+    Serial.println("HX711 Ready (Stable Lock Mode)");
+}
+
+void loop() {
+    if (scale.is_ready()) {
+        float currentReading = scale.get_units(1);
+        smoothedWeight = (alpha * currentReading) + (1.0 - alpha) * smoothedWeight;
+
+        // 1. Calculate the intended new display value
+        float targetWeight = round(smoothedWeight * 2.0) / 2.0;
+        if (abs(targetWeight) < 1.0) targetWeight = 0.0;
+
+        // 2. Stability Check
+        // Only update lastDisplayedWeight if the change exceeds the threshold
+        if (abs(targetWeight - lastDisplayedWeight) >= STABILITY_THRESHOLD) {
+            lastDisplayedWeight = targetWeight;
+        }
+
+        Serial.print("Weight: ");
+        Serial.print(lastDisplayedWeight, 1);
+        Serial.println(" g");
+    }
+
+    if (Serial.available()) {
+        char cmd = Serial.read();
+        if (cmd == 't') {
+            scale.tare();
+            smoothedWeight = 0; 
+            lastDisplayedWeight = 0; // Force display to zero immediately
+            Serial.println(">> Tared");
+        } else if (cmd == 'k') {
+            calibrateScale();
+        }
+    }
+
+    delay(10); 
+}

extensions/platformio/HX711_read/test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html