projects:electronics:tirepressuresensor

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projects:electronics:tirepressuresensor [2008/04/24 00:49] – external edit 127.0.0.1projects:electronics:tirepressuresensor [2014/11/13 10:50] (current) – external edit 127.0.0.1
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-==== Tire Pressure Sensor ====+====== Tire Pressure Sensor ======
  
 The pressure is determined by the formula, <m>P=0.145*{{{ADC/2^10}-0.04}/0.0012858}</m> where ADC is the value from the 10-bit DAC and P is the pressure in PSI. The pressure sensor is ratiometric with respect to V<sub>dd</sub> which makes it easy to interface to the PIC. Instead of the LCD display the finished project will use the [[7segdisplay]] to make it easier to read under different lighting conditions. Also, I have not been able to locate a small, backlight display, or even a small single line display that is inexpensive. The pressure is determined by the formula, <m>P=0.145*{{{ADC/2^10}-0.04}/0.0012858}</m> where ADC is the value from the 10-bit DAC and P is the pressure in PSI. The pressure sensor is ratiometric with respect to V<sub>dd</sub> which makes it easy to interface to the PIC. Instead of the LCD display the finished project will use the [[7segdisplay]] to make it easier to read under different lighting conditions. Also, I have not been able to locate a small, backlight display, or even a small single line display that is inexpensive.
  
-=== Prototype === +===== Prototype ===== 
-Coming soon+{{:projects:electronics:tirepressuresensor:pconbrdtop.jpg?300|}} 
 +{{:projects:electronics:tirepressuresensor:pconbrdbottom.jpg?300|}} 
 +{{:projects:electronics:18f_control_board.jpg?300|}}
  
-== Parts ==+{{:projects:electronics:18f_control_board_etch.pdf|}} 
 + 
 + 
 +===== Parts =====
 ^  Part#  ^  Description  ^  Source  ^  Cost  ^ ^  Part#  ^  Description  ^  Source  ^  Cost  ^
 |MPX5700DP-ND|0-101.5PSI Pressure sensor|[[http://www.digikey.ca/|Digikey]]|$16| |MPX5700DP-ND|0-101.5PSI Pressure sensor|[[http://www.digikey.ca/|Digikey]]|$16|
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 | |Click on air chuck for valve stem |Princess Auto|$3| | |Click on air chuck for valve stem |Princess Auto|$3|
 | |1/8NPT tank valve|Princess Auto|$2.50| | |1/8NPT tank valve|Princess Auto|$2.50|
-|  Total ||| <php>print 16+17;</php> |+|  Total ||| $<php>print 16+17;</php> |
  
  
  
-=== Development ===+===== Development =====
 Here are the {{:projects:electronics:excel_calculations.pdf|calculations}} I did for the module using a spreadsheet to graph the transfer function, then working out the math to something which can be easily done in assembly. Here are the {{:projects:electronics:excel_calculations.pdf|calculations}} I did for the module using a spreadsheet to graph the transfer function, then working out the math to something which can be easily done in assembly.
  
 {{:projects:electronics:mpx5700.pdf|MPX5700 Datasheet}} {{:projects:electronics:mpx5700.pdf|MPX5700 Datasheet}}
  
-{{:projects:electronics:p1020101.jpg|}}+{{:projects:electronics:p1020101.jpg?300|}}{{:projects:electronics:7segdisplay:display_working.jpg?300|}}
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  • Last modified: 2014/11/13 10:50
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