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Need Assist in Programing Flowmeter and temperature sensor to the RaspberryPi (Python)

e14 Contributor

Hey guys i'm new to the community and just starting out with the raspberry pi.

i do have some basic programming experience with C and FORTRAN but python is new to me.

 

I am working on a project that requires tow of the Liquid flow Meter - Plastic 1/2" NPS Threaded (adafruit 828), and six of the Waterproff DS18B20 Digital temperature (adafruit item 381).

 

I am trying to program them into the raspberry Pi in order to record and display each of temperature sensor data in Fahrenheit and each flow meter need to put out instantaneous speed of liquid in Gal / Minutes.

 

Adafruit does have the code for the temperature sensor and the flow meter but the problem is that the code for flowmeter is designed to output the data on a twitter page and i can't make any heads or tails of it. also the two programs need to be able to put together in to a single file.

 

please help.

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    I am also trying to use the Adafruit flow meter.  My question is how is it wired to the RaspberryPi?  The sensor has a operating 5v, but the Pi's GPIO pin use 3v3, I am concered about damaging my RaspberryPi.  Did you use a level shifter or some resisters?  Can you provide some pics or a wiring diagram?

  • 0 in reply to sausage_toes

    Darren the flow meter is a very simple device by the looks . The Hall sensor merely delivers  a number of pulses per revolution of the impeller blades inside the unit.

     

    You can try powering this sensor off 3.3V see if you are lucky (simplest option ..watch out for degraded performance!!)

     

    Have a simple voltage divider from say a 3.3K and 1.8 K resistor  to give you the 3.3V levels (approx ) that you want. You may need to play with this to get the right resistances depending on the output impedance.

     

    Use a level Shifter as you state either an integrated solution or some single transistor design

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  • 0 in reply to sausage_toes

    Darren the flow meter is a very simple device by the looks . The Hall sensor merely delivers  a number of pulses per revolution of the impeller blades inside the unit.

     

    You can try powering this sensor off 3.3V see if you are lucky (simplest option ..watch out for degraded performance!!)

     

    Have a simple voltage divider from say a 3.3K and 1.8 K resistor  to give you the 3.3V levels (approx ) that you want. You may need to play with this to get the right resistances depending on the output impedance.

     

    Use a level Shifter as you state either an integrated solution or some single transistor design

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