Digital pressure gauge

[fjpompeo]

Hi all,

I need a voltimeter to read a 0-150BAR or 0-250BAR to 0-10Vcc pressure sensor. Was thinking to use an AVR or PIC 0-10V digital Voltmeter with expanded end of scale, lets say 0V is 0BAR and 10V is 150BAR or 250BAR, I mean, when the microprocessor reads 10V instead of display 10 it will display 150 or 250 adjustable with a single pole two positions switch.

 

[jayanth.devarayanadurga]

I can write code for it. You cannot give 10V input to microcontroller. If your sensor gives 0 to 10V then you have to scale down it to 0 to 5V and give it to adc input pin. Is your sensor output linear? Post the datasheet of sensor and I will write the code.

 

[fjpompeo]

Dear Yesterday, 18:38 #1 fjpompeo
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Level:13Digital pressure gauge
Hi all,

I need a voltimeter to read a 0-150BAR or 0-250BAR to 0-10Vcc pressure sensor. Was thinking to use an AVR or PIC 0-10V digital Voltmeter with expanded end of scale, lets say 0V is 0BAR and 10V is 150BAR or 250BAR, I mean, when the microprocessor reads 10V instead of display 10 it will display 150 or 250 adjustable with a single pole two positions switch. Edit Post Reply Reply With Quote Multi-Quote Msg Report Post View Profile Private Message .
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Dear jayanth.devarayanadurga,

Very thank you for your prompt reply, the datasheet is in portuguese but important thinks to concider in the design is 0Bar=0V and 250Bar=10Vcc (or 5Vcc after resistor divider), 24Vcc power source, just one decimal case. I can use a resistor divider with no problem since need at least 2k of load according to the datasheet. If possible use a two line LCD display compatible with HD44780U. The power supply will be a 12V to 24V doubler with LM2575 and three Li-Po cells. Please make comments that you consider important to learn programming with AVR or PIC as per your choose.
Best regards,
Fernando J. Pompeo - BRAZIL

 

[jayanth.devarayanadurga]

I will do it with PIC16F887 and INTRCOSC 1 MHz and mikroC Compiler. I need to know few things. What pressure sensor are you using? Link for it? Is it a linear device?

See if this code works.

 

[fjpompeo]

I apologise, the sensor I'm using is a DANFOSS MBS1250.

 

[jayanth.devarayanadurga]

Ok. Datasheet doesn't tell much. I think it is a linear device. Connect it so/p to adc input pin (0 - 5V) and see if it gives correct values.