feat(wokwi-hx711): arduino uno test

Author: urish

.github/workflows/wokwi-test.yml

@@ -34,6 +34,9 @@ jobs:
           - name: dht22-stm32
             path: wokwi-dht22/dht22-stm32
             scenario: dht22.test.yaml
+          - name: hx711-uno
+            path: wokwi-hx711/hx711-uno
+            scenario: hx711.test.yaml
           - name: ili9341-uno
             path: wokwi-ili9341/lcd-uno
             scenario: ili9341.test.yaml

README.md

@@ -13,6 +13,8 @@ This repository contains a set of test projects for many Wokwi parts. The tests
   - [ESP32](./wokwi-dht22/dht22-esp32/)
   - [Raspberry Pi Pico](./wokwi-dht22/dht22-pico/)
   - [STM32L0](./wokwi-dht22/dht22-stm32/)
+- wokwi-hx711
+  - [Arduino Uno](./wokwi-hx711/hx711-uno/)
 - wokwi-ili9341
   - [Arduino Uno](./wokwi-ili9341/lcd-uno/)
 - wokwi-lcd1602

wokwi-hx711/hx711-uno/diagram.json

@@ -0,0 +1,16 @@
+{
+  "version": 1,
+  "author": "Claude Code",
+  "editor": "wokwi",
+  "parts": [
+    { "type": "wokwi-arduino-uno", "id": "uno", "top": 163.8, "left": 18.6, "attrs": {} },
+    { "type": "wokwi-hx711", "id": "hx711", "top": 0, "left": 100, "attrs": { "type": "5kg" } }
+  ],
+  "connections": [
+    [ "uno:GND.1", "hx711:GND", "black", [ "v-20", "*", "v0" ] ],
+    [ "uno:3", "hx711:DT", "blue", [ "v-28.8", "h-168.8", "v-107.7" ] ],
+    [ "uno:2", "hx711:SCK", "green", [ "v-19.2", "h-187.9", "v-107.4" ] ],
+    [ "uno:5V", "hx711:VCC", "red", [ "v20", "h-178.6", "v-320.3" ] ]
+  ],
+  "dependencies": {}
+}

wokwi-hx711/hx711-uno/hx711.test.yaml

@@ -0,0 +1,25 @@
+name: 'HX711 Load Cell Test'
+version: 1
+author: 'Claude Code'
+
+steps:
+  - wait-serial: 'HX711 test!'
+  - wait-serial: 'HX711 initialized and tared'
+  # Wait for first reading - should be near zero after taring
+  - wait-serial: 'Raw: 0 Weight: 0.00 units'
+  # Wait for second reading to confirm consistency
+  - wait-serial: 'Raw: 0 Weight: 0.00 units'
+  # Set load cell to a specific value (simulate weight applied)
+  - set-control:
+      part-id: hx711
+      control: load
+      value: 1050
+  # Check reading with weight applied (441000 raw / 420 scale = 1050 units)
+  - wait-serial: 'Raw: 441000 Weight: 1050.00 units'
+  # Change weight to different value
+  - set-control:
+      part-id: hx711
+      control: load
+      value: 1680
+  # Check new reading (705600 raw / 420 scale = 1680 units)
+  - wait-serial: 'Raw: 705600 Weight: 1680.00 units'

wokwi-hx711/hx711-uno/platformio.ini

@@ -0,0 +1,6 @@
+[env:uno]
+platform = atmelavr
+board = uno
+framework = arduino
+lib_deps =
+    bogde/HX711@^0.7.5

wokwi-hx711/hx711-uno/src/main.cpp

@@ -0,0 +1,41 @@
+#include <Arduino.h>
+#include "HX711.h"
+
+// HX711 circuit wiring
+const int LOADCELL_DOUT_PIN = 3;
+const int LOADCELL_SCK_PIN = 2;
+
+HX711 scale;
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println(F("HX711 test!"));
+
+  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
+
+  // Set scale factor (calibration value)
+  // For the 5kg load cell simulation, raw values range from 0-2100
+  scale.set_scale(420.0); // This gives us readings in a 0-5 range for 0-2100 raw
+
+  // Tare the scale to zero
+  scale.tare();
+
+  Serial.println(F("HX711 initialized and tared"));
+}
+
+void loop() {
+  delay(500);
+
+  if (scale.is_ready()) {
+    long rawValue = scale.get_value();
+    float weight = scale.get_units();
+
+    Serial.print(F("Raw: "));
+    Serial.print(rawValue);
+    Serial.print(F(" Weight: "));
+    Serial.print(weight, 2);
+    Serial.println(F(" units"));
+  } else {
+    Serial.println(F("HX711 not ready"));
+  }
+}

wokwi-hx711/hx711-uno/wokwi.toml

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