1. what has worked? what hasn't? / 2.What questions need to be resolved? / 3.What will happen when? / 4.What have you learned?
STEP 1 MEASURING DATA
I´m doing diferents test using diferent sensors moduls, like Magnetic Sensor Switch, Reflective Infrared Optical Sensor , AD8232 Single Lead Heart Rate Monitor, Biomedical Sensor Pad (10 pack), HMC5883L Triple Axis Compass Magnetometer Sensor Module, MLX90614 Non-Contact Sensors, to know which of them emitted a reliable data about the body and how it emitted it, to know if it could amplify it to be able to obtain the forms of cymatica in the machine.
AD8232 HEART RATE MONITOR:
Finally and after many tests the sendor that I have selected for the project has been AD8232 Heart Rate Monitor.
The first tests were with arduino one only to make the test, and to visualize the electrical impulses. I connected the biosensors in different parts of the body to see the different electrical stimuli, but the distribution that appears in the graphic is the one indicated to receive the heart beat.
Use the code that comes to make the sensor test, and everything worked correctly.
APAM8403 AMPLIFIER BOARD:
This board is a very important piece for the project, since it is essential to generate the waves in the liquid to amplify the input signal. So design a board that could fit the PAM8403 Mini 5V Audio Amplifier Board With Switch Potentiometer.
The diagram consists of input, to receive the data, amplifying it to two outputs one for right and one for left, the amplifier is powered with 9v.
I designed the board, with eagle, that is the program in which I have worked all the assignments and it´s easy for me for design. Once the design is obtained, proceed to the process of routing, drilling and cutting of the board.
The components I have used for this board are: APAM8403 Mini 5V Audio Amplifier Board With Switch Potentiometer / 1 mosfet / 1 regulator / 1 capacitor 10uf / 1 resistor 499ohm / 1 green led / 1 resistor 0.01ohm / 4 pin 2x1 / pin 11x1.
The welding part is my favorite, since it is a challenge to work with such small components. When the board is finished, finish the process by soldering APAM8403 Mini 5V Audio Amplifier Board with Switch Potentiometer. This component will buy it in an electronics store for a price of 2 $. For what was satisfactory, having made an amplifier with very good results at such a low cost.
AD8232 HEART RATE MONITOR + APAM8403 AMPLIFIER BOARD:
Finally I connected the amplifier to an input AD8232 Single Lead Heart Rate Monitor, and the output to a speaker to be able to obtain the electrical impulses of the amplified body that could be audible. First objective covered for the project, make the invisible visible or audible.
The power regulator was a need I had not planned. But having to unite all the modules in the same machine, it was complicated to have to feed all the parts, with different powers. So I designed with the help of Cesar Cruz, our teacher of electronics, this system where you can connect the different modules, input and output according to the needs that my project needed.
As you can see in the diagram, there are an input and output of 9v, two outputs of 3v, and two other outputs of 5v. This board is powered by a 9v battery, which distributes the pontencia in to the different outputs.
STEP 2 PROCESSING DATA
This board was one of the challenges of fab academy, I had to design and produce several models, to finally get one that will work for the project and for the weekly assignments. In the Fab Lab, we had to use to design the arduino, a crystal of 16mhz with 2 consensadores and not the one of 20mhz like the original, since it was the one that we could obtain and had compatibility with the code. (The process of this board can be extended in Assignment 4)
FABDUINO MODIFIED + AD8232 HEART RATE MONITOR + APAM8403 AMPLIFIER BOARD + POWER REGULATOR:
It is time to combine the components to be able to have the final prototype. The wiring has been somewhat complex to organize, you can see the outline in the design I made in the next photo. The data is output by the AD8232 heart Rate, and output to the fabduino to pin A0 where it will be processed by the indicated programming so that it can emit musical tones when receiving sound stimuli. The ouput comes out of pin 8 from the arduino to the amplifier that transmits it to the speaker. All this is powered by a 9v battery, which through the relay distributes the powers to the different components.
STEP 3 GRAPHIC VISUALIZATION - ANALOGIC
Use as a basis the example of Sparfunk indicated for the sensor, the problem is that the electrical impulses are very changing and could not define a continuous form in the liquid. So I needed to process the data using a Fabduino and be able to delay the input time. The digital network is programmed so that the sensor does not receive information stops with "no tone" and when it receives data "tone" emitting a continuous frequency, to which I can modifical the delay, in this case it is in 2 seconds of delay. Hear_rate.ino
First experiment was test the display with pure frequencies emitted by a generator of frequencies from my mobile. The results were incredible, beautiful patterns appear in the water, while I was changing frequencies through a frequency generator. The expectations for visual results were beginning to grow.
Use the CNC router tool, since it was clear that you wanted a wooden box with a compact appearance and easy functionality.
To do this design the piece with 3d modeling in rinoceros, to get an idea of the final product and its different parts. The process was divided into two parts, one part of cut, by parts exported to 2d, with easy execution of cut, and another part that was the top cover, in which the piece had to be exported in 3d, adjudicandoles to files Necessary data for the process as can be seen in assignment 12. This time I did not commit as many blacksmiths as the first few times I used the cnc router, and I took into account the size of the drill 12mm, and the thickness of the material in its design 18mm of wood in this case.
In order to change the batteries and organize the sensors, design an opening system, using a rotating shaft. This axis was the support that served as tripod for the project
The final results were as expected.
The part of 3d printing, was a subject more accessory for the project, but for me it was important to have a support where to place my camera, or the mobile, where to register the patterns of the different people in order to be able to compare them . So use the Rinoceros to do 3d modeling, then export it in .STL. The program I used for printing was Cura, and the 3d printer a printerbot, with a black PLA filament.
LASER CUT CASE
Use the laser cutter to develop a system of internal organization of the modules.
Design the part in rhinoceros with the measurements of the piece of the wooden cade. Finally I generated a sub-box with different layers, in which I could organize the components, and the cables, without looking as messy as in the initial delivery.
Use several materials, 5 layers of 3mm mdf, and a top layer with nobles of transparent 3mm acrylic modules.
Also use this technique to put personal branding details, and create the accessories for the use of the machine, such as the water jar.