Yesterday's temperature high in Phoenix, Arizona was 39C (102F). The interior of one's parked vehicle can subsequently reach 65C+ unshaded from the sun. Stagnant air aides in this elevation and discomfort which was cause for the application of a device for any appreciable deflection of this excess heat.

Plundering from a 10$ child science kit found at most hobby stores (a surprisingly cheaper alternative to individual parts from an electronics store such as Radio Shack) with a delicate drilling and soldering, we have installed an independent solar powered (as to not drain the vehicle's battery) air circulation system.

Prototyping an Arduino sketch can lead to several disconnects and reconnects of the USB cable. This unobtrusive on/off switch hack takes (3) dollar store parts to achieve what is often sold retail for vastly more. A gratuitous USB cable and/or toggle switch may already be some thing presently laying around your shop.

Ingredients
USB Car Charger
USB Cable
Toggle Switch
Paint (Optional)

Recipe
Hard connect GND, D+ and D- to the female USB and toggle the VCC. (USB Pinout)

Last year, we neglected to add our annual Everybody Draw Mohammed Day contribution and with this year's event closing in, we thought we would release our "last year" sketch prior to publishing this year's addition. Allow us, if you shall, a rendition of the meme "Dick Butt", Mohammed Butt...with retsyn.

Reference: Arduino Bowel Gauge

 // Bowel Gauge _ @TVMiller
 #include <LiquidCrystal.h>
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int ssr;
int sensorstart = 0;

void calibrate() {
 lcd.setCursor(0, 0);
 lcd.print("Calibrating...");
for (int x=0, x<10; x++) {
 ssr = analogRead(A0);
 sensorstart = sensorstart + ssr;
  delay(100);
}
 sensorstart = sensorstart / 10;          // Average
 lcd.clear();
}

void setup()
{
 lcd.begin(16, 2);
 lcd.clear();
 calibrate();
}

void loop()
{
  int sensorlive = analogRead(A0);       // Live reading
   int dif = (sensorlive - sensorstart); // Subtract calibrated reading
    float difsol = dif * 0.191;          // Variance to fl oz per 40 oz
     float difoz = difsol * 1.0425;      // Convert fluid to solid ounces

     if (difoz < 0) {
 lcd.setCursor(0, 0);
 lcd.print("0.00");                      // Remove negative fluctuations
 } else {
 lcd.setCursor(0, 0);
 lcd.print(difoz);                      // Print OZ
 }

 lcd.setCursor(6, 0); lcd.print("OZ");
 lcd.setCursor(11, 0); lcd.print("BOWEL");
 
 lcd.setCursor(0, 1);
 lcd.print(millis()/1000);               // Print SEC

 lcd.setCursor(6, 1); lcd.print("SEC");
 lcd.setCursor(11, 1); lcd.print("GAUGE");

  delay(100);
}

Mine are well rounded.

In our current climate of caloric disseminators, few observe before and after exhumation of waste. To clarify, using a resistance sensor and an Arduino, we have hacked your bowels.

Ingredients
Arduino Uno
Aluminum or Copper Strips
1K Ohm 1/4W Resistor
100K Ohm 1/4W Resistor
0.1uf Capacitor
LCD Display [Optional]
10K Potentiometer
10 Ohm 1/4W Resistor

[Notations] The resistance sensor observed in the following multimedia is a first version testing sensor. Affixing it to a constantly drenched porcelain surface proved difficult and was temporarily remedied with Gorilla Tape.

A brass valve was added to the bowl fill line extending from the fill valve as to regulate the water level with in the bowl. Typical specs fill water to crest the rear siphon allowing waste to displace water in to the drainage line as to prevent over flow.


Sketch
[Notations] The following is a non-smoothing sketch as our current coding for a smoothing sketch is currently being modified and tested in addition to a low pass filter PWM alternative.

Resistance was measured between 60 and 100 fluid ounces and this variance was divided by the 40 fluid ounces, then multiplied by 1.0425 to obtain weight ounces.

 #include <LiquidCrystal.h>
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int sensorstart = 0; // Intial reading

void setup()
{
  sensorstart = analogRead(A0); // Store initial reading
  lcd.begin(16, 2);
}

void loop()
{
  int sensorlive = analogRead(A0); // Live reading
   int dif = (sensorlive - sensorstart); // Subtract start reading
    float difsol = dif * 0.191; // Variance to fluid ounces per 40 oz measure
     float difoz = difsol * 1.0425; // Convert fluid to solid ounces

 if (difoz < 0){
 lcd.setCursor(0, 0);
 lcd.print("0.00"); // Zero fluctuation
 } else {
 lcd.setCursor(0, 0);
 lcd.print(difoz); // Print ounces
 }

 lcd.setCursor(6, 0);
 lcd.print("oz");
 lcd.setCursor(11, 0);
 lcd.print("Bowel");
 
 lcd.setCursor(0, 1);
 lcd.print(millis()/1000); // Seconds
 lcd.setCursor(6, 1); lcd.print("sec");
 lcd.setCursor(11, 1); lcd.print("Gauge");

   delay(1000); // per second
}

Update(s)
Updated Arduino Bowel Gauge Sketch (Calibration Version)

HackADay "Skull and Wrenches" logo used with(out) permission by HackADay.com

Update(s)
HackADay - We Asked For It Arduino Bowel Gauge
Instructables - Arduino Bowel Gauge
Element14 - 10 Awesome Arduino Projects

Amid a light rain, masculine drivers detest the forced automation of wind shield wipers and are often resorted to having turn on, then off the wiper controls to obtain that single swipe. Here, we have hacked an Isuzu Trooper to now offer a single swipe from a single depression of a button. Control is restored.