initial implementation of HX711 and 1602 display

diff --git a/HX711/HX711.ino b/HX711/HX711.ino
new file mode 100644 (file)
index 0000000..f14f062
--- /dev/null
+++ b/HX711/HX711.ino
@@ -0,0 +1,114 @@
+#include "HX711.h"
+
+// HX711.DOUT  - pin #A2
+// HX711.PD_SCK        - pin #A1
+
+HX711 scale(A2, A1);           // parameter "gain" is ommited; the default value 128 is used by the library
+
+#include <LiquidCrystal.h>
+LiquidCrystal lcd(8, 9, 4, 5, 6, 7); // rs enable d0-d3
+
+void setup() {
+  lcd.begin(16, 2);
+  lcd.print("HX711");
+
+  Serial.begin(115200);
+  Serial.println("HX711 Demo");
+
+  Serial.println("Before setting up the scale:");
+  Serial.print("read: \t\t");
+  Serial.println(scale.read());                        // print a raw reading from the ADC
+
+  Serial.print("read average: \t\t");
+  Serial.println(scale.read_average(20));      // print the average of 20 readings from the ADC
+
+  Serial.print("get value: \t\t");
+  Serial.println(scale.get_value(5));          // print the average of 5 readings from the ADC minus the tare weight (not set yet)
+
+  Serial.print("get units: \t\t");
+  Serial.println(scale.get_units(5), 1);       // print the average of 5 readings from the ADC minus tare weight (not set) divided 
+                                               // by the SCALE parameter (not set yet)  
+
+  scale.set_scale(465.f);                      // this value is obtained by calibrating the scale with known weights; see the README for details
+  scale.tare();                                        // reset the scale to 0
+
+  Serial.println("After setting up the scale:");
+
+  Serial.print("read: \t\t");
+  Serial.println(scale.read());                 // print a raw reading from the ADC
+
+  Serial.print("read average: \t\t");
+  Serial.println(scale.read_average(20));       // print the average of 20 readings from the ADC
+
+  Serial.print("get value: \t\t");
+  Serial.println(scale.get_value(5));          // print the average of 5 readings from the ADC minus the tare weight, set with tare()
+
+  Serial.print("get units: \t\t");
+  Serial.println(scale.get_units(5), 1);        // print the average of 5 readings from the ADC minus tare weight, divided 
+                                               // by the SCALE parameter set with set_scale
+
+  Serial.println("Readings:");
+}
+
+#ifdef FLOAT_AVG
+#define g_bucket 10
+#define g_size g_bucket*3
+float g_history[g_size];
+int g_pos = 0;
+#endif
+
+void loop() {
+  float g = scale.get_units();
+  Serial.print(g);
+
+ 
+  lcd.setCursor(0,0); // col,row
+  lcd.print(g);
+  lcd.print(" ");
+
+#ifdef FLOAT_AVG
+  g_history[g_pos++] = g; // insert into circular buffer
+  g_pos %= g_size;
+
+  float sum = 0;
+  for(int i=1; i<g_size; i++) {
+    int pos = ( g_pos + i ) % g_size;
+    sum += g_history[pos];
+    if ( i % g_bucket == 0) {
+       float avg = sum / i;
+       Serial.print(" ");
+       Serial.print(avg, 3);
+        lcd.print(avg);
+        lcd.print(" ");
+    }
+  }
+#endif
+ 
+  int key = analogRead(0);
+  Serial.print("\t");
+  Serial.println(key);
+
+  lcd.setCursor(12,1);
+  lcd.print(key);
+  lcd.print("   ");
+
+  lcd.setCursor(0,1);
+  if ( key > 1000 ) {
+       // nothing pressed
+  } else if ( key > 800 ) {
+       lcd.print(" tare ");
+        scale.tare();
+  }
+
+  uint32_t adc = scale.read();
+  lcd.print(adc);
+  lcd.print(" ");
+
+  Serial.print("\t");
+  Serial.println(adc);
+
+
+//  scale.power_down();                                // put the ADC in sleep mode
+//  delay(100);
+//  scale.power_up();
+}