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uno-stats-monitor/monitor_sender.sh

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+#!/bin/bash
+# UNO Monitor Sender
+# kidacro@archamedis.net
+#
+
+# TTY Device to use
+TTY="/dev/ttyACM0"
+##########################################################
+
+# Stats
+# we are limited to 2 lines and 16 chars per line so, light stats & no labels
+CLOAD=$(mpstat | awk '$3 ~ /CPU/ { for(i=1;i<=NF;i++) { if ($i ~ /%idle/) field=i } } $3 ~ /all/ { printf("%d%%",100 - $field) }')
+CTEMP=$(sensors | grep TSI0_TEMP: | tr '°+' ' ' | awk '{print $2}' | paste -sd ', ')
+MFREE=$(free -h | grep Mem | awk '{print $4}' | paste -sd ', ')
+RFREE=$(df -h | grep /dev/nvme0n1p3 | awk '{print $4}' | paste -sd ', ')
+LFREE=$(df -h | grep /dev/sda1 | awk '{print $4}' | paste -sd ', ')
+SFREE=$(df -h | grep /dev/mapper/store0-lvol1 | awk '{print $4}' | paste -sd ', ')
+
+# setup device
+stty -F $TTY ispeed 9600 ospeed 9600 -ignpar cs8 -cstopb -echo -hupcl
+
+# Line 1
+LINE1="#1$CLOAD $CTEMP $MFREE@"
+/usr/bin/echo "$LINE1" > $TTY # -ne
+echo Sending to $TTY: $LINE1
+
+# line 2
+LINE2="#2$RFREE $LFREE $SFREE@"
+/usr/bin/echo "$LINE2" > $TTY
+echo Sending to $TTY: $LINE2

uno-stats-monitor/monitor_uno.ino

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+/*
+ * UNO Monitor Receiver (4bit LCD Version)
+ * kidacro@archamedis.net
+ * 
+ * Waits for input over serial connection and displays on LCD
+ * 
+ * Input Schema:
+ *  Start char is: '#'
+ *  End char is: '@'
+ *  2nd char denotes which line number to use
+ *  
+ * Example:
+ *  Line 1: #1Archamedis Status@
+ *  Line 2: #299% free / etc.@
+ *  
+ */
+
+// include the library code:
+#include <LiquidCrystal.h>
+
+// LCD Pinout:
+// LCD RS pin to digital pin 12
+// LCD Enable pin to digital pin 11
+// LCD D4 pin to digital pin 5
+// LCD D5 pin to digital pin 4
+// LCD D6 pin to digital pin 3
+// LCD D7 pin to digital pin 2
+// LCD R/W pin to ground
+// LCD VSS pin to ground
+// LCD VCC pin to 5V
+// 10K resistor:
+// ends to +5V and ground
+// wiper to LCD VO pin (pin 3)
+
+// Variable Init
+// LCD vars
+// initialize the library by associating any needed LCD interface pin
+//  with the arduino pin number it is connected to
+const int LCDRS = 12, LCDEN = 11, LCDD4 = 5, LCDD5 = 4, LCDD6 = 3, LCDD7 = 2;
+int LCDLength = 16;
+LiquidCrystal LCD(LCDRS, LCDEN, LCDD4, LCDD5, LCDD6, LCDD7);
+
+// Serial vars
+const byte numChars = 32;
+char receivedChars[numChars]; // an array to store the received data
+boolean newData = false;
+
+// Debugging (serial console must be connected)
+bool DEBUG = 1;
+ 
+void LcdSetup(void) {
+  // set up the LCD's number of columns and rows:
+  LCD.begin(LCDLength, 2);
+  
+  // Print a "waiting" message to the LCD.
+  LcdL1();
+  LCD.print("Starting Up...");
+  LcdL2();
+  LCD.print("Waiting for data");
+}
+
+void LcdCls(void) {
+  delay(10);
+  LCD.clear();  // The screen is empty
+  LcdL1(); // the cursor position is zeroed 
+  delay(10);
+}
+
+void LcdL1() {
+  delay(10);
+  LCD.setCursor(0, 0); // Define the cursor position as the 1st position of the 1st line
+  delay(10);
+}
+
+void LcdL2() {
+  delay(10);
+  LCD.setCursor(0, 1);  // Define the cursor position as the 1st position of the 2nd line
+  delay(10); 
+}
+
+// returns starting position of text
+void LcdCenter(int mylen) {
+  int mypos = 0;
+
+  return mypos;
+}
+
+void LcdWrite(String mymessage) {
+  int i = 0;
+  unsigned int mylen = mymessage.length(); 
+  
+  // trunicate string to lcd line length
+  if(mylen > LCDLength) {
+    mylen = LCDLength;
+  }
+
+  // Debug input and length
+  if(DEBUG) {
+    Serial.println("\n\nString: ");
+    Serial.println(mymessage);
+    Serial.println(mymessage.length());
+  }
+
+  // Output string
+  //LCD.print(mymessage);
+
+  // Output character by character
+  for(i=0; i < mylen; i++) {
+    char c = mymessage[i];
+    if(c != '\b') {
+      delay(10);
+      LCD.print(c);
+      delay(10);
+    }
+  }
+}
+
+void LcdWriteExample() {
+  LcdCls();
+
+  LcdL1();
+  LcdWrite("Archamedis Stats");
+
+  LcdL2();
+  LcdWrite("4.3ghz 89% 68C");
+  
+}
+
+void recvWithStartEndMarkers() {
+    static boolean recvInProgress = false;
+    static byte ndx = 0;
+    char startMarker = '#';
+    char endMarker = '@';
+    char rc;
+ 
+    while (Serial.available() > 0 && newData == false) {
+        rc = Serial.read();
+
+        if(recvInProgress == true) {
+            if(rc != endMarker) {
+                receivedChars[ndx] = rc;
+                ndx++;
+                if (ndx >= numChars) {
+                    ndx = numChars - 1;
+                }
+            }
+            else {
+                receivedChars[ndx] = '\0'; // terminate the string
+                recvInProgress = false;
+                ndx = 0;
+                newData = true;
+            }
+        }
+
+        else if(rc == startMarker) {
+            recvInProgress = true;
+        }
+    }
+}
+
+void showNewData() {
+  if(newData == true) {
+    if(DEBUG) {
+      Serial.print("This just in ... ");
+      Serial.println(receivedChars);
+    }
+
+    // Print on line 1 or 2
+    // dev: fucking c and its fixed arrays
+    //      we have to define 1st character (line number) as BS and when printing, search for that BS character to skip printing that 1 character, grrr
+    if(receivedChars[0] == '1') {
+      LcdL1();
+      LcdWrite("                "); // 16 spaces for a blank line
+      LcdL1();
+      receivedChars[0] = '\b';
+      LcdWrite(receivedChars);
+    }
+    else if(receivedChars[0] == '2') {
+      LcdL2();
+      LcdWrite("                "); // 16 spaces for a blank line
+      LcdL2();
+      receivedChars[0] = '\b';
+      LcdWrite(receivedChars);
+    }
+    
+    newData = false;
+  }
+}
+
+void setup (void) {
+  // Init LCD panel
+  LcdSetup();
+
+  // Init Debugging output
+  if(DEBUG) {
+    Serial.begin(9600);
+    while (!Serial) {
+      ; // wait for serial port to connect. Needed for native USB port only
+    }
+  }
+
+  // Init normal operation
+  else {
+    Serial.begin(9600);
+  }
+  
+}
+
+// main()
+void loop (void) {
+  // process input
+  recvWithStartEndMarkers();
+  showNewData();
+}