Screaming Bread
Contents
The Idea
Louisville Mini Maker Faire was an opportunity for LVL1 and 1st Build have a little fun. So, LVL1 decided to play a prank. 1st Build had a refrigerator on display. The door would open and close during the event. When the door opens, the light goes on inside. So, what if when the door opened and the light went on inside, a loaf of bread screamed.
The Basics
A loaf of Bread
AdaFruit FX Sound Board
5v Power Supply
CDS sensor
Speaker
Recorded screams
Wiring
Power
A 5/3.3 volt power supply is located.
The power supply will use a 9 volt battery. A barrel connector compatible with the power supply board is added to a 9v battery connector.
Light Trigger
First, we located a CDS cell. One was found in a motion detection sensor with a broken cover window.
Breaking the cover window even more exposed the CDS cell.
Next came removal and placement on a piece of PCB.
At first, it was thought that an external pull up resistor was needed to trigger the FX board. But the FX board had internal pull up resistors, so the added resistor was not necessary. Two wires were attached and the CDS sensor was ready.
Putting It All Together
The assembly of the unit begins with connecting the power supply and FX Board. The pin alignment of the power supply and FX Board power terminals allows the two boards to be soldered together directly. Next the CDS Sensor is soldered to trigger line 1.
Connect to power supply to the FX Sound Board. In this case, the power supply is set up to plug into a breadboard. So directly connecting the breadboard to FX board is straight forward.
The cell is wired to a pull up trigger pin on the FX board.
The idea is that when light hits the CDS, the resistance drops and the pin reads a ground signal. Speakers are wired next. Add recorded screams in a random setup and all is done for the circuit.
Bread
Next, a loaf of bread is hollowed out. The sensor is moved high in the loaf to detect light.
What Happened
The best laid plans did not work out. Access to the fridge was blocked. No joy.
Now What
Halloween is coming. Maybe another opportunity will arise.
