add scales_kit example

Author: Gitshaoxiang

examples/KIT/SCALES_KIT/SCALES_KIT.ino

@@ -0,0 +1,114 @@
+/*
+*******************************************************************************
+* Copyright (c) 2022 by M5Stack
+*                  Equipped with M5Core sample source code
+*                          配套  M5Core 示例源代码
+* Visit the website for more information：https://docs.m5stack.com/en/app/scales_kit
+* 获取更多资料请访问：https://docs.m5stack.com/zh_CN/app/scales_kit
+*
+* describe: SCALES KIT WEIGHT UNIT EXAMPLE.
+* date：2022/02/23
+*******************************************************************************
+  Connect WEIGHT UNIT to port B (G26/36), calibration instructions: press button A to remove the tare weight when there is no load,
+  press button B, switch the standard weight value left and right and put down the corresponding weight, confirm for calibration.
+  将WEIGHT UNIT连接至端口B（G26/36）， 校准说明：无负重情况下按下按键A去处皮重， 按下按键B，左右切换标准重量值并放下对应重量砝码，comfirm进行校准。
+  Libraries:
+  - [HX711](https://github.com/bogde/HX711)
+
+*/
+
+#include <M5Stack.h>
+#include <M5GFX.h>
+#include "HX711.h"
+
+M5GFX display;
+M5Canvas canvas(&display);
+
+// HX711 related pin Settings.  HX711 相关引脚设置
+#define LOADCELL_DOUT_PIN 36
+#define LOADCELL_SCK_PIN 26
+
+HX711 scale;
+
+void setup() {
+  M5.begin(); //Init M5Stack.  初始化M5Stack
+  M5.Power.begin(); //Init power  初始化电源模块
+  display.begin();
+  canvas.setColorDepth(1); // mono color
+  canvas.createSprite(display.width(), display.height());
+  canvas.setTextDatum(MC_DATUM);
+  canvas.setPaletteColor(1, GREEN);
+
+  canvas.drawString("Calibration sensor....", 160, 80);
+  canvas.pushSprite(0, 0);
+  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
+
+
+  scale.set_gain();
+  //The scale value is the adc value corresponding to 1g
+  scale.set_scale(27.61f);  //set scale
+  scale.tare(); // auto set offset
+}
+
+char info[100];
+
+void loop() {
+  canvas.fillSprite(BLACK);
+  canvas.setTextSize(1);
+  canvas.drawString("Connect the Weight Unit to PortB(G26,G36)", 160, 40);
+  canvas.drawString("Click Btn A for Tare deduction", 160, 55);
+  canvas.drawString("Click Btn B Switch to Calibration mode", 160, 70);
+  float weight = scale.get_units(10)/1000.0;
+  // float weight = scale.get_units(10) / 1.0;
+  canvas.setTextSize(3);
+  if(weight >= 0) {
+    Serial.printf("Weight: %.2f", weight);
+    sprintf(info, "Weight: %.2f", weight);
+    canvas.drawString(String(info) + "kg", 160, 150);
+    // canvas.drawString(String(info) + "g", 160, 150);
+  }else{
+    canvas.drawString("Weight: 0kg", 160, 150);
+    // canvas.drawString("Weight: 0g", 160, 150);
+  }
+  M5.update();
+  if (M5.BtnA.wasPressed()) {
+    scale.tare();
+    canvas.drawString("0g Calibration!", 160, 180);
+  }
+  if (M5.BtnB.wasPressed()) {
+    long kg = 5;
+    while (1)
+    {
+      M5.update();
+      canvas.fillSprite(BLACK);
+      canvas.setTextSize(1);
+      canvas.drawString("Connect the Weight Unit to PortB(G26,G36)", 160, 40);
+      canvas.drawString("Click Btn A/C to change kg value", 160, 55);
+      canvas.drawString("Click Btn B Calibration Comfirm", 160, 70);
+      canvas.setTextSize(3);
+      canvas.drawString("Calibration:" + String(kg) + "kg", 160, 150);
+      canvas.drawString("comfirm", 160, 200);
+      canvas.fillTriangle(40, 200, 60, 220, 60, 180, 1);
+      canvas.fillTriangle(280, 200, 260, 220, 260, 180, 1);
+      canvas.pushSprite(0, 0);
+      if(M5.BtnA.isPressed()){
+        kg--;
+      }
+      if(M5.BtnC.isPressed()){
+        kg++;
+      }
+      if(M5.BtnB.wasPressed()){
+        break;
+      }
+      delay(10);
+    }
+    long kg_adc = scale.read_average(20);
+    kg_adc = kg_adc - scale.get_offset();
+    scale.set_scale( kg_adc / (kg * 1000.0));
+    // canvas.drawString(String(kg) + "kg Calibration: " + String(kg_adc / (kg * 1000.0)), 160, 180);
+    canvas.drawString("Set Scale: " + String(kg_adc / (kg * 1000.0)), 160, 180); 
+    canvas.pushSprite(0, 0);
+    delay(1000);
+  }
+  canvas.pushSprite(0, 0);
+}