Initial commit

.gitignore

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

.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"
+    ]
+}

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:uno_r4_minima]
+platform = renesas-ra
+board = uno_r4_minima
+framework = arduino
+lib_deps = 
+	adafruit/Adafruit AS7341@^1.4.1
+	adafruit/Adafruit BusIO@^1.16.2

src/main.cpp

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+#include <Arduino.h>
+#include <Adafruit_AS7341.h>
+#include <Wire.h>
+
+Adafruit_AS7341 as7341;
+
+int measurement = -1;
+int baselineValue = 0;
+bool reactionComplete = false;
+unsigned long startTime = 0;
+const int triggerPin = 2;
+const int SIGNIFICANT_DECREASE = 5000;
+bool triggerArmed = false;  // Add this to wait for pin to stabilize
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) delay(10);
+  
+  Wire.begin();
+  delay(100);
+
+  Serial.println("Looking for AS7341 sensor...");
+  if (!as7341.begin()) {
+    Serial.println("Could not find AS7341 sensor. Check wiring!");
+    while (1) delay(10);
+  }
+
+  Serial.println("AS7341 sensor initialized!");
+
+  // Configure sensor
+  as7341.setATIME(100);
+  as7341.setASTEP(999);
+  as7341.setGain(AS7341_GAIN_256X);
+  as7341.enableLED(false);
+  
+  pinMode(triggerPin, INPUT_PULLUP);
+  
+  // Wait for trigger pin to stabilize to HIGH
+  delay(100);
+  if (digitalRead(triggerPin) == HIGH) {
+    triggerArmed = true;
+    // Serial.println("Trigger armed and ready!");
+  }
+}
+
+void loop() {
+  delay(50);
+  
+  if (!as7341.readAllChannels()) {
+    Serial.println("Error reading channels");
+    return;
+  }
+
+  measurement = as7341.getChannel(AS7341_CHANNEL_630nm_F7);
+
+  // Print trigger state periodically
+  static unsigned long lastTriggerDebug = 0;
+  if (millis() - lastTriggerDebug > 500) {
+    // Serial.print("Trigger pin state: ");
+    // Serial.println(digitalRead(triggerPin));
+    lastTriggerDebug = millis();
+  }
+
+  // Start timer when trigger is pulled (goes from HIGH to LOW) and take baseline
+  if (triggerArmed && !reactionComplete && digitalRead(triggerPin) == LOW && startTime == 0) {
+    baselineValue = measurement;
+    startTime = millis();
+    Serial.println("Reaction started!");
+    Serial.print("Baseline value: ");
+    Serial.println(baselineValue);
+  }
+
+  // Check for completion if reaction has started
+  if (!reactionComplete && startTime > 0) {
+    if (baselineValue - measurement >= SIGNIFICANT_DECREASE) {
+      reactionComplete = true;
+      float duration = (millis() - startTime) / 1000.0;
+      Serial.print("Reaction complete! Duration: ");
+      Serial.print(duration);
+      Serial.println(" seconds");
+    }
+  }
+
+  Serial.print('>');
+  Serial.print("630nm:");
+  Serial.println(measurement);
+}

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