From 3d7b301819dfbbf95bb858f12d018c65f2c9c72a Mon Sep 17 00:00:00 2001
From: Timo Denk <simssosdenk@googlemail.com>
Date: Sun, 17 Apr 2016 10:39:13 +0200
Subject: [PATCH 1/2] Analog multiplexer notes and schematics draft

---
 AnalogMux.txt  |  30 ++++++++++++++++++++++++++++++
 Schmeatics.fzz | Bin 0 -> 4036 bytes
 2 files changed, 30 insertions(+)
 create mode 100644 AnalogMux.txt
 create mode 100644 Schmeatics.fzz

diff --git a/AnalogMux.txt b/AnalogMux.txt
new file mode 100644
index 0000000..6d8d93b
--- /dev/null
+++ b/AnalogMux.txt
@@ -0,0 +1,30 @@
+// analog multiplexer control signals
+#define analogMuxS0 5
+#define analogMuxS1 6
+#define analogMuxS2 7
+
+// analog multiplexer enable signal
+#define analogMuxE 8
+
+// analog multiplexer data
+#define analogMuxData A0
+
+
+int read4051AnalogPin(int pin) {
+	// select multiplexer input
+	digitalWrite(analogMuxS0, pin & 1);
+	digitalWrite(analogMuxS1, pin & 2 >> 1);
+	digitalWrite(analogMuxS2, pin & 4 >> 2);	
+
+	// enable 
+	digitalWrite(analogMuxE, LOW);
+	delayMicroseconds(5);
+
+	// read value
+	int val = analogRead(analogMuxData);
+
+	// disable
+	digitalWrite(analogMuxE, HIGH);
+
+	return val;
+}
\ No newline at end of file
diff --git a/Schmeatics.fzz b/Schmeatics.fzz
new file mode 100644
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From cb81c76a29c91ea687f105a5e62a0f27c9203bc1 Mon Sep 17 00:00:00 2001
From: Timo Denk <simssosdenk@googlemail.com>
Date: Sat, 25 Jun 2016 14:13:52 +0200
Subject: [PATCH 2/2] Battery Voltage

---
 Display-Teensy/Display-Teensy.ino | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/Display-Teensy/Display-Teensy.ino b/Display-Teensy/Display-Teensy.ino
index 4c0e2d3..bb04a5e 100644
--- a/Display-Teensy/Display-Teensy.ino
+++ b/Display-Teensy/Display-Teensy.ino
@@ -47,6 +47,10 @@ int dataLength, bytesAvailable, bytesAvailableAfterDelay;
 
 long numberOfBytesAvailableLastTime = 0;
 
+// battery voltage
+int vout = 0, vin = 0;
+float R1 = 47000.0, R2 = 4700.0;
+
 // display object
 ILI9341_t3 tft = ILI9341_t3(TFT_CS, TFT_DC);
 
@@ -55,6 +59,7 @@ String sensorUnits[numberOfSensors] = { "A", "A", "A", "V", "A", "C", "C", "C",
 byte sensorLineOffset[numberOfSensors] = { 0, 0, 0, offsetPerHr, offsetPerHr, 2 * offsetPerHr, 2 * offsetPerHr, 2 * offsetPerHr, 3 * offsetPerHr, 3 * offsetPerHr, 6 * offsetPerHr, 6 * offsetPerHr, 6 * offsetPerHr };
 
 void setup() {
+  pinMode(batteryVoltagePin, INPUT);
   Serial.begin(9600);
   
   // start tft
@@ -181,7 +186,7 @@ void loop() {
       float val = * sensorValue;
       
       if (i == 12) { // battery voltage
-        val = map((float)analogRead(batteryVoltagePin), 0, 1024, 0, 4.2);
+        val = getBatteryVoltage();
       }
       
       logFile.print(",");
@@ -287,6 +292,25 @@ String addLeadingZeros(int x, int digits) {
   return str;
 }
 
+// battery voltage
+long readVcc() {
+  long result;
+  ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
+  delay(2);
+  ADCSRA |= _BV(ADSC);
+  while (bit_is_set(ADCSRA,ADSC));
+  result = ADCL;
+  result |= ADCH<<8;
+  result = 1126400L / result;
+  return result;
+}
+
+int getBatteryVoltage() {
+  vout = (analogRead(batteryVoltagePin) * readVcc() / 1000) / 1024.0;
+  vin = vout / (R2/(R1+R2));
+  return vin;
+}
+
 
 
 // draw bitmap code