Asthma Eliminator MicroMedic Competition Entry

Transcription

1 Asthma Eliminator 2013 MicroMedic Competition Entry Overview: Our project helps people with asthma to avoid having asthma attacks. It does this by monitoring breath pressure and alerting the user if the pressure exceeds a preset point, customized to that user s lung capacity. Sometimes people with asthma don t realize that an asthma attack is coming. This device will make them aware so that they can reduce their level of exercise so that they can continue exercising, but at a safe level. Description of Operation: A pressure sensor measures the pressure on the bottom of a nebulizer mouthpiece. An analog to digital converter transforms the pressure signal to a digital signal that goes to the microcontroller. The microcontroller turns on bar graph LED s to show how much relative pressure is being input. It also checks if the pressure is above a preset level. If it isn t, it will turn on the 4 segment LED display to show the word GO. If it is above this level, it will show STOP. Video Link:

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4 {{ MicroMedic Project 2013.spin Program Date: 7/25/2013 Version: 1.0 Description: This program reads the pressure input from a pressure sensor on AD0 and outputs the values on a bargraph as well as displaying "GO" or "STOP" on a 4-segment LED display when the pressure is above or below a setpoint. This is used for determining when an individual that suffers from asthma as getting near the point of having an asthma attack. }} CON 'let the compiler know which crystal and PLL settings to use _xinfreq = 5_000_000 _clkmode = xtal1 + pll16x INPUT = false 'bit pattern is all 0s OUTPUT = true 'bit pattern is all 1s PC_BAUD = 115_200 'PC serial terminal's baud rate ADC_CH0 = 1 << 0 ADC_CH1 = 1 << 1 ADC_CH2 = 1 << 2 ADC_CH3 = 1 << 3 ADC_ALL = ADC_CH0 + ADC_CH1 + ADC_CH2 + ADC_CH3 'LED Bar graph pin definitions BAR_GRAPH_0 = 0 BAR_GRAPH_1 = 1 BAR_GRAPH_2 = 2 BAR_GRAPH_3 = 3 BAR_GRAPH_4 = 4 BAR_GRAPH_5 = 5 BAR_GRAPH_6 = 6 BAR_GRAPH_7 = 7 BAR_GRAPH_8 = 8 '4 Digit 7-segment display pin definitions DIGIT_0 = 9 DIGIT_1 = 10 DIGIT_2 = 11 DIGIT_3 = 12 DIGIT_4 = 13 DIGIT_5 = 14 DIGIT_6 = 15 DIGIT_7 = 16 DIGIT_8 = 17 DIGIT_9 = 18 DIGIT_10 = 19 OBJ adc : "PropBOE ADC" 'Requires 1 cog pc : "Parallax Serial Terminal" 'Requires 1 cog VAR 'Globally accessible variables, shared by all cogs long pressure long cogstack[20] byte breath_ok PUB Go rawreading 'Start other objects pc.start(pc_baud) adc.start(adc_ch0) 'Launch additional cogs repeat rawreading := adc.in(0) pressure := rawreading/2-13 if rawreading => 49 breath_ok := 0 else breath_ok := 1 'Get the reading from channel 0 on the ADC. 'Scale the raw reading to be displayed on the LED bar graph. 'Note that this scaled reading does not correspond with a particular 'unit of pressure such as mmh2o, mmhg, kpa, or PSI. Check the sensor's 'datasheet (MPX5010DP) for the mv/mmh2o conversion value if you want an 'absolute reading in a particular unit of pressure. ' 'The global variable "pressure" is shared between this cog and the cog 'that is controlling the LED bar graph. 'SETPOINT FOR "GO" OR "STOP" DETERMINATION -- CALIBRATED FOR THE USER

5 waitcnt(cnt + clkfreq/20) 'wait for ~1/20th seconds so as not to flood the computer's serial port with data. PUB RunBarGraph i dira[bar_graph_8..bar_graph_0] := OUTPUT dira[digit_10..digit_0] := OUTPUT 'set range of pins to output '(this works in this case because the pins are consecutive) repeat outa[bar_graph_8..bar_graph_0] := 1<<pressure - 1 if(breath_ok) outa[digit_8] := 1 outa[digit_5] := 1 outa[digit_3] := 1 outa[digit_8] := 0 outa[digit_6] := 0 outa[digit_5] := 0 outa[digit_9] := 1 outa[digit_1] := 1 outa[digit_5] := 0 outa[digit_3] := 1 outa[digit_9] := 0 outa[digit_1] := 0 else outa[digit_7] := 1 outa[digit_3] := 1 outa[digit_4] := 0 outa[digit_5] := 1 outa[digit_7] := 0 outa[digit_0] := 0 outa[digit_2] := 0 'Continually set the value of the scaled pressure to the LED bar graph pins. 'Do a little bitwise manipulation to make the LEDs look nice. 'Letter G 'Letter O 'Letter S 'Letter T outa[digit_8] := 1 outa[digit_8] := 0 outa[digit_5] := 0 outa[digit_9] := 1 outa[digit_1] := 1 outa[digit_9] := 0 outa[digit_2] := 0 outa[digit_3] := 0 'Letter O outa[digit_10] := 1 outa[digit_5] := 1 outa[digit_10] := 0 outa[digit_1] := 0 outa[digit_4] := 0 'Letter P DAT {{ TERMS OF USE: MIT License Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. }}

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