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Type: Posts; User: 2_Wheeler

1. ## Thread: Library for 128 by 64 OLED I2C Display

by 2_Wheeler
Replies
22
Views
13,209

### 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...
2. ## Thread: Coming Soon: Teensy-LC (low cost Teensy)

by 2_Wheeler
Replies
549
Views
226,087

### 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...
3. ## Thread: Coming Soon: Teensy-LC (low cost Teensy)

by 2_Wheeler
Replies
549
Views
226,087

### 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.
4. ## Thread: Coming Soon: Teensy-LC (low cost Teensy)

by 2_Wheeler
Replies
549
Views
226,087

### 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...
5. ## Thread: Coming Soon: Teensy-LC (low cost Teensy)

by 2_Wheeler
Replies
549
Views
226,087

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...
6. ## Thread: Coming Soon: Teensy-LC (low cost Teensy)

by 2_Wheeler
Replies
549
Views
226,087

### 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...
7. ## Thread: Coming Soon: Teensy-LC (low cost Teensy)

by 2_Wheeler
Replies
549
Views
226,087

### 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...
8. ## Thread: Coming Soon: Teensy-LC (low cost Teensy)

by 2_Wheeler
Replies
549
Views
226,087

### 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...
9. ## Thread: Coming Soon: Teensy-LC (low cost Teensy)

by 2_Wheeler
Replies
549
Views
226,087

### 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...
10. ## Thread: Coming Soon: Teensy-LC (low cost Teensy)

by 2_Wheeler
Replies
549
Views
226,087

### 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...

by 2_Wheeler
Replies
16
Views
4,084

### 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...

by 2_Wheeler
Replies
16
Views
4,084

### 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...

by 2_Wheeler
Replies
16
Views
4,084

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...

by 2_Wheeler
Replies
16
Views
4,084

### 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...

by 2_Wheeler
Replies
16
Views
4,084

### 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...

by 2_Wheeler
Replies
16
Views
4,084

### 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...

by 2_Wheeler
Replies
16
Views
4,084

### 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)...

by 2_Wheeler
Replies
16
Views
4,084

### 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...

by 2_Wheeler
Replies
16
Views
4,084

### 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):

...