Team:Valencia UPV/Design
Where will our project flourish? How will the information be transmitted to the seed? What’s needed in order to have access to the encoded products and hence produce them? Do I have to transmit the light pulses myself? All these questions had to be answered somehow. Even more, what about having a device that can be used with just two simple buttons? That's our goal, and here is our device, designed following Aladdin's magic lamp: This is our device, our lamp, where all the process of transformation and product selection happens. It has been designed to hold closed and isolated environment so that there’s no light interference and no in/out contamination. Additional considerations have been taken in order that the seeds can develop appropriately in such environment and the product extraction can be performed. If you wish to see it in your hands, download the Augment app (available for Android and iOS) in your smartphone and print the image that follows this link. Once you’ve done so, scan the image with the Augment app and check our model thanks to the power of augmented reality. If you had been at the 2015 Jamboree and you have our card, scan it, it’s the same image. Watch the video for a brief description of the device and its usage. Our device has been designed on a future stage in which the implementation of the genetic circuit is achieved in seeds. The following assumptions have been considered: At the Jamboree we presented the device programmed and designed for demonstration purposes only (without seeds), meaning that it didn’t took into account the RTC usage and the control circuit relies entirely on one of the integrated timers of the microcontroller. Additionally, the production cycle was reduced to less than a minute so that people could see an on-site demonstration Our device measures 41.27x26.27x21 cm (16.25x10.34x8.27 inch). It’s composed of the following parts: This is the base of the entire model. It contains the batteries compartment [10] (two 4xAA battery holders in parallel) at the bottom and secured in place with a lid and a screw. The battery wires go parallel to the contour of the body in a groove (17) that it’s sealed later. It incorporates a handle and a spout through which a vacuum pump can be connected in order to extract the medicine from the seeds, and serve it to whom it needs it. The device contains two caps. The first one (13) is at the end of the spout, isolating the inside part of the device. This blocks any form of contamination on, or transmission of, the GM seeds. The second cap (15) is located between the handle and the body (1). When you add water to the device there’s always a risk of adding too little (seeds won’t reach to the water) or too much (seeds will drown). In order to avoid such a problem, we’ve made a hole in the body of the device at the right height so that seeds will grasp the water but wont drown in it. You will only need to add water and let the excess run out through such hole. Once you’re done setting the device, you only have to plug the second cap there. Here is where the seeds will be placed and receive the information for the selection of a product through a combination of lights.One the lights are applied, the seeds germinate. Based on the design of a mixer of chocolate milk mixer (Baticao), we designed the bottom of the cup with holes to not just allow water pass through for the seeds reach it, but also so that when the cup is moved up and down the water will wash in and out of the cup. This flow of water will cause turbulance and the seeds will move and allow shed the light information to the inner hidden seeds that rise up. These two parts enclose the electronics and allow the movement of the cup. On one hand, the inner lid holds the red and blue LEDs (eight of each) that will project sufficient light to illuminate as many seeds possible. It also holds the cup (3) to the rest of the structure of the device though hooks in the cup and slots inside the inner lid. This is a critical part of the device. It’s here where the control electronics is located in the circuit holder (12) and where the servo (6) is placed. The purpose of the servo is to allow vertical movement of the cup (3) shake the move the seeds thanks to water going in and out of the cup with the help of the mechanism that turns rotational movement (7) into vertical movement (8 & 9). It will move the cup 1 out of 4 seconds of light pulse emission. It’s thanks to the control electronics that the information can be transmitted through appropriate timing and activation of the right light pulses. We chose a free design rather than using an open source system as such systems occupy a relative big volume for the amount of space that was available in the device. Besides, we had the chance to simulate the circuit with Proteus software in order to check its functionality before implementing the entire circuit in a PCB board, built at our university. The control electronics board is divided in to five different sections that correspond to: We chose the PIC18LF14K50 from a list of microcontrollers that took in consideration several aspects like amount of pins it had (we didn’t wanted a huge chip), the communication capabilities with the Real Time Clocl (see below), low power capabilities, package type (we only have experience with through hole packages), integrated inside the simulation program, etc. Thanks to this microcontroller, we can control the LED switching in time and have a simple user interface for product selection. For its programing we used the student edition of MPLAB software and the C18 compiler. Its program its entirely based on interrupts from either the user interface, communications from the RTC or the RTC itself when sends the wake-up signal to the microcontroller. If the microcontroller is the brain of the device, the RTC is the heart of it. It incorporates an alarm function that can be set from the microcontroller. This function is critical, as its set accordingly to wake up the microcontroller from its sleep state. The microcontroller could replace the need of an external RTC, but that will have meant to configure it to set the wake up call every second, perform the math of the amount of elapsed time and go back to sleep. It might not seem a lot of time to do such task, but because it will do it every second over two periods of 1.5 hours (we assumed it took 10 ms for the wake-up call, calculate and go back to the sleep state) it will add up 108 extra seconds (it will happen 10800 times). It doesn’t look a lot an additional 1 minute and 48 seconds, but if the device was to be set for longer periods of information transmission that amount of extra time will increase proportionally and out of the established parameters. It was the only servo that we could find that was available at the electronic distributors that the university uses and had a description of its performance characteristics. Its powered through a controlled transistor because when it receives no signal it still consumes power (8 mA) and depletes the batteries. That way only when its desired to be used, the servo is powered and then the control signal is sent. Also to mention that it’s an analog position servo because we were interested in leaving the cup at its highest position rather than at any random height. This is achieved though the applied control signal. It’s a simple two button (14) and four colored LEDs display (16). Starting with the buttons, they provide functions of selection (Button 1 in green), start and stop of the information transmission, and wake up of the device (Button 2 in blue). The four LEDs indicate the medicine that has been chosen and if the device is in standby mode while waiting for user input (one of the LEDs will be blinking in that scenario for thirty seconds before setting the circuit to sleep mode and save power). It contains the red and blue LEDs responsible for the transmission of the required information that will make the biological circuit work. It’s composed of eight red and eight blue LEDs and two transistors. These transistor will manage the activation of the corresponding LEDs by means of a low current signal from the microcontroller. Sure, the device fulfills its theoretical purpose. This is the list of enhancements that can take our device to new levels, offering better user experience and more: A LCD screen could expand the information that the current 4 colored LED layout shows, as well as integrate a simple user interface that will allow to manage additional functions implemented on the device. These functions could include remaining production time, execute a diagnosis of the device, check power supply status, change parameters, etc. Integrating Wi-Fi capabilities, the user will have control of the device around the globe as well as access to the additional functions described above and even reprogramming of the control circuit. Right now the device has been designed for using eight AA batteries working in two groups of four in order to have enough voltage for the voltage regulator and enough capacity to last two transmission cycles. It could be expanded its usage by designing a single battery that could fit inside the geometry of the device, meet the voltage requirements, and have a different composition that will make it last longer than the alkaline batteries. It could also be designed to be rechargeable through a micro-USB port and a cellphone charger or compatible. Product extraction has to be done with the help of an external vacuum pump. In the following versions of the device this component will be integrated. From this point on the device works by itself, selecting the red and blue light pulses in the appropriate order so that the information is transmitted to the genetic circuit. During the process of pulse emission, the cup will move up and down in order to allow water come through the holes and shake all the seeds and allow hidden seeds receive the information. Most of the device has been constructed by 3D printing at our university except the body of the device do to time limitation. We were recommended to use a technique called thermoforming, which consists on using a sheet of plastic, heat it until it’s malleable, formed to the shape of a prepared mold and cut the excess. Feel free to download the files that have made possible the construction of such device and to add modifications to it. Leave a comment on our social networks about it.Overview
Considerations
Device: Description
Device: Electronics
What will be next?
How to
Step by step handling instructions
Construction