Hello all!
For the last project for my application of ICs class, we have been tasked with updating Northrop and Nilakhe's No-Touch Ocular Pulse Measurement System. I attached the assignment specifications that I was given as well as the article itself that is mentioned.
I've read a lot of questions and answers on this site before, but I have never myself posted anything here. I'm trying to put up this project because I am very lost on it and am searching for any guidance I can get.
For this project, we are to redesign/update the systems shown in Figures 1, 8 and 9 in the article, though they are expected to be dramatically simplified for this undergraduate IC class. For example, we will not be using any kind of sensors to measure eye movement, but instead will be using a function generator as the input. We are not intended to design every portion of this circuit to have it operate exactly as it would in the systems outlined in the report, but instead we are to replicate the "concept" of each circuit.
For example, for Figure 1, my thought thus far was to create a PLL that could lock on to extremely low frequencies , like those of a human heart beat (so essentially 60 beats/min, or 1 Hz). I discussed this with my professor and he agreed that this would be a solution to the problem, though it would be impossible to design a PLL to operate with such low frequencies, which I agreed with. He recommended I build a frequency multiplier to up the frequency for the PLL, then divide it down afterward. For the PLL portion, we have built these before in the class using an LM565, but after looking into frequency multipliers I was having trouble finding something that was simple enough for this course while also accomplishing what I needed for such a low frequency signal. Figure 9 requires that this same circuit that "locks on" to the eye's movement be able to reset itself if the signal is lost (i.e. the subject blinks). This is one portion that I am very stuck on as I don't have a good idea of something I could build to do this. I've looked at the possibility of using a LM555 as a SR flip-flop to reset the PLL circuit, but in practice I really don't know how to do this.
As may be clear by now, we are only meant to redesign these systems to mimic the general concept of the original design rather than create some kind of eye tracking device. I don't have access to a significant number of components, but we have used simple ones like LM565s, 555s, 380s, 386s, 741s... etc. as well as typical resistor and capacitors (we haven't worked with many inductors so I'm not sure if we have much ot anything for that). This post is already really long, so if you're still reading, thanks for sticking with me. I'm not looking for an answer, or someone to give me a full design; all I wanted is to see if anyone can give me any kind of guidance on what I should try because I feel very lost. We are expected to complete this project in a week while most students like myself are home for the Thanksgiving holiday and are completely unable to test possible designs. I'm terrified I won't be able to come up with any kind of product in the time we were given...
Thank you for your time, and if you celebrate the holiday, then Happy Thanksgiving!
Also please tell me if more information is needed or if I've posted this in entirely the wrong place.
For the last project for my application of ICs class, we have been tasked with updating Northrop and Nilakhe's No-Touch Ocular Pulse Measurement System. I attached the assignment specifications that I was given as well as the article itself that is mentioned.
I've read a lot of questions and answers on this site before, but I have never myself posted anything here. I'm trying to put up this project because I am very lost on it and am searching for any guidance I can get.
For this project, we are to redesign/update the systems shown in Figures 1, 8 and 9 in the article, though they are expected to be dramatically simplified for this undergraduate IC class. For example, we will not be using any kind of sensors to measure eye movement, but instead will be using a function generator as the input. We are not intended to design every portion of this circuit to have it operate exactly as it would in the systems outlined in the report, but instead we are to replicate the "concept" of each circuit.
For example, for Figure 1, my thought thus far was to create a PLL that could lock on to extremely low frequencies , like those of a human heart beat (so essentially 60 beats/min, or 1 Hz). I discussed this with my professor and he agreed that this would be a solution to the problem, though it would be impossible to design a PLL to operate with such low frequencies, which I agreed with. He recommended I build a frequency multiplier to up the frequency for the PLL, then divide it down afterward. For the PLL portion, we have built these before in the class using an LM565, but after looking into frequency multipliers I was having trouble finding something that was simple enough for this course while also accomplishing what I needed for such a low frequency signal. Figure 9 requires that this same circuit that "locks on" to the eye's movement be able to reset itself if the signal is lost (i.e. the subject blinks). This is one portion that I am very stuck on as I don't have a good idea of something I could build to do this. I've looked at the possibility of using a LM555 as a SR flip-flop to reset the PLL circuit, but in practice I really don't know how to do this.
As may be clear by now, we are only meant to redesign these systems to mimic the general concept of the original design rather than create some kind of eye tracking device. I don't have access to a significant number of components, but we have used simple ones like LM565s, 555s, 380s, 386s, 741s... etc. as well as typical resistor and capacitors (we haven't worked with many inductors so I'm not sure if we have much ot anything for that). This post is already really long, so if you're still reading, thanks for sticking with me. I'm not looking for an answer, or someone to give me a full design; all I wanted is to see if anyone can give me any kind of guidance on what I should try because I feel very lost. We are expected to complete this project in a week while most students like myself are home for the Thanksgiving holiday and are completely unable to test possible designs. I'm terrified I won't be able to come up with any kind of product in the time we were given...
Thank you for your time, and if you celebrate the holiday, then Happy Thanksgiving!
Also please tell me if more information is needed or if I've posted this in entirely the wrong place.
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