feat(wokwi-photoresistor-sensor): test with Arduino Uno

Author: urish

.github/workflows/wokwi-test.yml

@@ -46,6 +46,9 @@ jobs:
           - name: microsd-card-esp32
             path: wokwi-microsd-card/sd-esp32
             scenario: sd.test.yaml
+          - name: photoresistor-uno
+            path: wokwi-photoresistor-sensor/photoresistor-uno
+            scenario: photoresistor.test.yaml
           - name: slide-potentiometer-uno
             path: wokwi-slide-potentiometer/pot-uno
             scenario: slide-potentiometer.test.yaml

README.md

@@ -20,6 +20,8 @@ This repository contains a set of test projects for many Wokwi parts. The tests
   - [ESP32-C3 + I2C](./wokwi-lcd1602/lcd-i2c-esp32-c3/)
 - wokwi-micro-sd
   - [ESP32](./wokwi-micro-sd/sd-esp32/)
+- wokwi-photoresistor-sensor
+  - [Arduino Uno](./wokwi-photoresistor-sensor/photoresistor-uno/)
 - wokwi-slide-potentiometer
   - [Arduino Uno](./wokwi-slide-potentiometer/pot-uno/)
   - [ESP32](./wokwi-slide-potentiometer/pot-esp32/)

wokwi-photoresistor-sensor/photoresistor-uno/diagram.json

@@ -0,0 +1,22 @@
+{
+  "version": 1,
+  "author": "Uri Shaked",
+  "editor": "wokwi",
+  "parts": [
+    { "type": "wokwi-arduino-uno", "id": "uno", "top": 0, "left": 0, "attrs": {} },
+    {
+      "type": "wokwi-photoresistor-sensor",
+      "id": "photoresistor",
+      "top": 57.3,
+      "left": 263.3,
+      "rotate": 90,
+      "attrs": { "lux": "500" }
+    }
+  ],
+  "connections": [
+    [ "uno:5V", "photoresistor:VCC", "red", [ "v48.5", "h204.8", "v-67.2" ] ],
+    [ "uno:A0", "photoresistor:AO", "green", [ "h-14.21", "v29.3", "h142.21", "v-48" ] ],
+    [ "photoresistor:GND", "uno:GND.2", "black", [ "h0.4", "v57.6", "h-185.7" ] ]
+  ],
+  "dependencies": {}
+}

wokwi-photoresistor-sensor/photoresistor-uno/photoresistor.test.yaml

@@ -0,0 +1,29 @@
+name: 'Photoresistor Sensor Test (ESP32)'
+version: 1
+author: 'Wokwi'
+
+steps:
+  - wait-serial: 'Photoresistor Sensor Test'
+  # Wait for first reading
+  - delay: 500ms
+  # Check initial light value (should be around 500 lux)
+  - wait-serial: 'Sensor value: 250'
+  # Wait for second reading to confirm consistency
+  - delay: 500ms
+  - wait-serial: 'Sensor value: 250'
+  # Set new lux value (bright light)
+  - set-control:
+      part-id: photoresistor
+      control: lux
+      value: 1000
+  - delay: 500ms
+  # Check new values (analog value should be lower)
+  - wait-serial: 'Sensor value: 169'
+  # Set low light condition
+  - set-control:
+      part-id: photoresistor
+      control: lux
+      value: 100
+  - delay: 500ms
+  # Check low light values (analog value should be higher)
+  - wait-serial: 'Sensor value: 511'

wokwi-photoresistor-sensor/photoresistor-uno/platformio.ini

@@ -0,0 +1,4 @@
+[env:uno]
+platform = atmelavr
+board = uno
+framework = arduino

wokwi-photoresistor-sensor/photoresistor-uno/src/main.cpp

@@ -0,0 +1,37 @@
+#include <Arduino.h>
+
+const int PHOTORESISTOR_PIN = A0;
+
+// These constants should match the photoresistor's "gamma" and "rl10" attributes
+const float GAMMA = 0.7;
+const float RL10 = 50;
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println("Photoresistor Sensor Test");
+}
+
+void loop()
+{
+  // Read the analog value from the photoresistor
+  int lightValue = analogRead(PHOTORESISTOR_PIN);
+
+  // Convert to voltage (ESP32 ADC reference is 3.3V, 12-bit resolution)
+  float voltage = (lightValue * 5) / 1024.0;
+
+  // Convert the analog value into lux value:
+  float resistance = 2000 * voltage / (1 - voltage / 5);
+  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
+
+  // Print the values
+  Serial.print("Sensor value: ");
+  Serial.print(lightValue);
+  Serial.print(", Voltage: ");
+  Serial.print(voltage);
+  Serial.print(", Lux: ");
+  Serial.println(lux);
+
+  // Wait before next reading
+  delay(1000);
+}

wokwi-photoresistor-sensor/photoresistor-uno/wokwi.toml

@@ -0,0 +1,4 @@
+[wokwi]
+version = 1
+firmware = '.pio/build/uno/firmware.elf'
+elf = '.pio/build/uno/firmware.elf'