Simple thermometer using Arduino Micro and OLED display

RE: Simple thermometer using Arduino Micro and OLED display

phil.s — Wed, 08 Aug 2018 17:26:08 GMT

Better late than never.

Very good - for a newcomer to OLEDs, this was just what I was after.

I am going to fit two of these to a fridge and a freezer. I suspect that the temperature control of the fridge thermostat is pretty poor with swings between 1-degree C and 10-degrees C.

This will be the basis of a new fridge thermostat. I was using the TMP36 for the freezer which it's ideal for.

My setup is 1.3" 128 x 64 OLED from Lamnu (?) on Amazon and has SPI as well as I2C. As reviewers have noted, documentation is next to useless.

So for I2C, remove the 4K7 SMD resistor marked SPI and short out the I2C pads (not the SPI as well). Subtstitute SD1106 for SSH1306 libraries and change references accordingly.

On Nano or Uno, use A4 for SDA and A5 for SCL.

I like the averaging and the fact that I didn't have to code for negative values.

The only problem I had was with the I2C address - I tried Nick Gammons' address finder sketch, but it couldn't find it. Is this because the SSH1106 chip doesn't support full read/write?

However, 0x3D worked for the 128 x 64

Thanks a lot.

RE: Simple thermometer using Arduino Micro and OLED display

e14 Contributor — Tue, 15 Mar 2016 12:57:12 GMT

Hi Frederick,

first of all thank you for this project, it's perfect for my needs.

I have one question for 2nd code - with button.

I'm confused with this line:

attachInterrupt(4, debounce, FALLING); - instead of 4, do we maybe must use pin 7 for interrupt? If no, can you please explain me then connection between pin7 (button) and pin4.

Thank you very much.

P.S. I'm new to this and learning every day...

RE: Simple thermometer using Arduino Micro and OLED display

fvan — Sun, 05 Jul 2015 08:46:58 GMT

Added a button linked to an interrupt to toggle the displayed value between degrees C, F and K. Updated the post above [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-bb92e072-9bf1-4740-a077-0d1ba5905db5/2352.contentimage_5F00_1.png:16:16]

RE: Simple thermometer using Arduino Micro and OLED display

balearicdynamics — Sun, 05 Jul 2015 07:54:13 GMT

Hello, the following two sources (sorry but it is impossible to attach) are the temperature class I use on ChipKit PI - that is 100% compatible with Arduino. It makes available the temperature reading in all the known (by me) formats: Fahrenheit, Celsius, Kelving, Rankine. You can use it as a library in the Arduino IDE or include the two files in your own project as well.

Enrico

Include file

[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:3ef06e6b-9b7d-4651-b12d-db8be7f5e991:type=c_cpp&text=%2F**%0A*+%5Cfile+Temperature.h%0A*+%5Cbrief+Constants+and+class+prototypes%0A*%2F%0A%0A%23ifndef+Temperature_h%0A%23define+Temperature_h%0A%0A%23include+%3Cinttypes.h%3E%0A%0A%2F%2F%21+Constant+for+Kelvin+temperature+conversion%0A%23define+KELVINC+273%0A%0A%2F%2F%21+Absolute+zero+value+for+calculation%0A%23define+ABSOLUTE_ZERO_CELSIUS+-273.15%0A%0A%2F%2F%21+Celsius+temperature+offset.+Should+be+calibrated+depending+on+the%0A%2F%2F%21+analog+reading+from+the+choosen+chip.+This+value+is+preset+for%0A%2F%2F%21+LM35+temperature+sensor.%0A%23define+TEMP_OFFSET+10%0A%0A%2F%2F%21+Analog+channel+for+the+temperature+sensor%0A%23define+TEMP_SENSOR+A1%0A%0Aclass+Temperature%0A%7B%0A++public%3A%0A++++Temperature%28%29%3B%0A++++void+CalcTemp%28float+sensor%29%3B%0A++++float+Celsius%28%29+const%3B%0A++++float+Fahrenheit%28%29+const%3B%0A++++float+Kelvin%28%29+const%3B%0A++++float+Rankine%28%29+const%3B%0A++private%3A%0A++++float+_Celsius%3B%0A++++float+_Fahrenheit%3B%0A++++float+_Kelvin%3B%0A++++float+_Rankine%3B%0A++++float+_sensorValue%3B%0A%7D%3B%0A%23endif]

Class file

[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:3ef06e6b-9b7d-4651-b12d-db8be7f5e991:type=c_cpp&text=%2F**%0A*+%5Cfile+Temperature.cpp%0A*+%5Cbrief+Class+to+manage+the+internal+temperature+of+the+devices.%0A*%0A*+The+Temperature+class+acquires+data+from+an+LM35+temperature+sensor%0A*%0A*%2F%0A%23include+%22Temperature.h%22%0A%0A%2F**%0A++*+%5Cbrief+Temperature+class+constructor.+Set+the+analog+pin+for+data+reading%0A++*%2F%0ATemperature%3A%3ATemperature%28%29+%7B%0A%7D%0A%0A%2F**%0A*+%5Cbrief+Convert+the+analog+value+to+the+respective+value.%0A*%0A*+As+the+call+to+the+temperature+reading+is+not+a+high+priority+task+and+does%0A*+not+need+very+high+responsivity%2C+when+the+analog+data+are+read+they+are+immediately%0A*+converted+to+the+three+temperature+scales%3A+Celsius%2C+Kelvin+and+Farehneit.%0A*%2F%0Avoid+Temperature%3A%3ACalcTemp%28float+sensor%29+%7B%0A++_sensorValue+%3D+sensor%3B%0A++_Celsius+%3D+%28%28%28_sensorValue+%2F+1024%29+*+5%29+*+100%29+-+TEMP_OFFSET%3B+%2F%2F+convert+the+reading+to+C%0A++_Fahrenheit+%3D+_Celsius+*+1.8+%2B+32.0%3B+%2F%2F+convert+the+reading+to+F%0A++_Kelvin+%3D+_Celsius+-+ABSOLUTE_ZERO_CELSIUS%3B+%2F%2F+convert+the+reading+to+K%0A++_Rankine+%3D+%28%28_Celsius+-+ABSOLUTE_ZERO_CELSIUS%29+*+9%29+%2F+5%3B+%2F%2F+convert+the+reading+do+R%0A%7D%0A%0Afloat+Temperature%3A%3ACelsius%28%29+const+%7B%0A++return%28_Celsius%29%3B%0A%7D%0A%0Afloat+Temperature%3A%3AFahrenheit%28%29+const+%7B%0A++return%28_Fahrenheit%29%3B%0A%7D%0A%0A%0Afloat+Temperature%3A%3AKelvin%28%29+const+%7B%0A++return%28_Kelvin%29%3B%0A%7D%0A%0A%0Afloat+Temperature%3A%3ARankine%28%29+const+%7B%0A++return%28_Rankine%29%3B%0A%7D]

Usage

In the sketch,

[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:3ef06e6b-9b7d-4651-b12d-db8be7f5e991:type=c_cpp&text=%23include+%22Temperature.h%22]

Then create a global library instance

[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:3ef06e6b-9b7d-4651-b12d-db8be7f5e991:type=c_cpp&text=%2F%2F%21+Internal+temperature+sensor+class+instance%0ATemperature+internalTemp%3B]

When needed (in the setup() or loop() functions) call the temperature reading

Here I use the TEMP_SENSOR analog pin value, but you can use your own method

[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:3ef06e6b-9b7d-4651-b12d-db8be7f5e991:type=c_cpp&text=++%2F%2F+Read+the+actual+temperature%0A++internalTemp.CalcTemp%28analogRead%28TEMP_SENSOR%29%29%3B]

Then everywhere you need you have the converted temperature in all the formats calling the class methods as shown below

[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:3ef06e6b-9b7d-4651-b12d-db8be7f5e991:type=c_cpp&text=Serial.println%28internalTemp.Celsius%28%29%29%3B%0ASerial.println%28internalTemp.Fahrenheit%28%29%29%3B%0ASerial.println%28internalTemp.Kelvin%28%29%29%3B%0ASerial.println%28internalTemp.Rankine%28%29%29%3B]

RE: Simple thermometer using Arduino Micro and OLED display

Robert Peter Oakes — Sat, 04 Jul 2015 20:58:30 GMT

Its all in the software so you can have it show in any unuit you prefer, Kelvin anyone [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-bb92e072-9bf1-4740-a077-0d1ba5905db5/contentimage_5F00_1.png:16:16]

RE: Simple thermometer using Arduino Micro and OLED display

clem57 — Sat, 04 Jul 2015 19:40:03 GMT

Can this show F degrees? Maybe a button for other countries like US.

Clem

RE: Simple thermometer using Arduino Micro and OLED display

DAB — Sat, 04 Jul 2015 19:21:36 GMT

Outside is too hot for me.

I prefer your room temperature, which is at least comfortable.

DAB