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Type: Posts; User: 2_Wheeler

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  1. Replies
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    I just bought the LC and have an eBay OLED i2c...

    I just bought the LC and have an eBay OLED i2c that uses the SH1106 library. I found this thread when the display did not work with the LC- like the other member here it worked fine with my Arduino...
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    On the first equation, it calls for an undefined...

    On the first equation, it calls for an undefined C, T, and mV, two of which (C and mV) I input from sensor specs using an example temperature (C) of 10 degrees and corresponding (mV) of 980. The...
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    Thanks for the help. I went to math class with...

    Thanks for the help. I went to math class with Barbie :), so I'm trying to work the equation listed. I came up with a negative number to square, which is impossible, so I've done something wrong.
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    Now that I have a viable sensor housing, I've...

    Now that I have a viable sensor housing, I've been trying to learn about converting millivolts (mV) to degrees Celsius (C) for use with the LC, but have experienced severe brain fade. ;) Time to ask...
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    Thanks for the links. I've been reading...

    Thanks for the links. I've been reading datasheets today and going through some brass pipe fittings I have on hand. I was able to cut the end off of an old 1/8 brass NPT temperature fitting and drill...
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    Thank you for your help and suggestions. I need...

    Thank you for your help and suggestions. I need to learn about op amplifiers.

    It seems like the best solution with what is mostly on hand is to craft a 3.3V capable sensor such as the one I linked...
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    I did some experimenting with the resistors on...

    I did some experimenting with the resistors on the sensor, and by changing the 2.2K + 550 to 10K + 550 I was within .2 degrees between the two sensors at room temp.

    I then immersed the sensor in...
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    Being a noob on this stuff, I found out my...

    Being a noob on this stuff, I found out my resistor value in the code for 3.3V was way off, my 41 degree ice water read 93 degrees, so I need to either adjust something or go with another sensor to...
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    Thanks for the answers. Would it be feasible to...

    Thanks for the answers. Would it be feasible to power the thermistor from the 5V input power (I'm using a hacked USB phone charger to step down 12V to 5V) and then read it on an analog pin? Do you...
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    I'm going to be using one of these for an...

    I'm going to be using one of these for an automotive gauge project. I see in the specs it has a 5V output on pin 17? Is it possible to use this to power a NTC thermistor that is designed to work on...
  11. Thanks for the advice, this is all new stuff to...

    Thanks for the advice, this is all new stuff to me. From what I've read, the DHT22 sensor is considered a "slow" sensor that needs a couple of seconds of delay. I've had the program running overnight...
  12. More success!

    The OLED arrived today and I learned about matching the code I had so it would display on the OLED as I wanted it to. I'm sure what is below is not perfect, but it gets the job done so far. My car is...
  13. DHT22 added to sketch

    My DHT22 air temp and humidity sensor arrived today and the next step has been completed. I have now bench tested both sensors on an Arduino Uno and they are within .09 degree F of each other. The...
  14. Thanks for helping to keep the thread clean. ...

    Thanks for helping to keep the thread clean.

    It occurs to me that I could if need be tap the incoming 5V and run that to the coolant sensor. So long as it is on the same ground, wouldn't the...
  15. I picked up a 12V to USB adapter at the Dollar...

    I picked up a 12V to USB adapter at the Dollar Tree (everything is $1) and took it apart. The board inside is like 30mm x 15mm, and once the USB port was removed it was fairly simple to solder on...
  16. Thanks for the advice. I will give that a try...

    Thanks for the advice. I will give that a try when the rest of my parts get here- have to get the car running also LOL.

    I am now planning on segregating the power in/sensor out into two different...
  17. Thanks for the advice. It looks like I can...

    Thanks for the advice. It looks like I can operate on 3.3V OK.

    I'm planning on having a 6 pin connector at the rear of the gauge. At this point it will be as follows:
    1) 12V + in
    2) Ground
    3)...
  18. Update- I used two 6' strands of 18 gauge...

    Update-
    I used two 6' strands of 18 gauge automotive TXL wire and the reading was within 1 degree of ambient.

    I then rewired the board to run the sensor on 3.3V. I had to change the resistor...
  19. I've been doing some reading here and have a...

    I've been doing some reading here and have a question after reading this thread (not sure if it is OK to post on old threads here):
    https://forum.pjrc.com/threads/25128-teensy-3-1-5V-output


    ...
  20. New member, question about an automotive gauge

    I've been working on designing an automotive oil temperature gauge that would incorporate air temperature and humidity via a DHT22 sensor. The oil temperature is measured by a General Motors OEM...
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