Success - display real-time data on 128x64 OLED

Projects General Guidance
1

Last week I inquired about guidance in writing real-time data to an OLED and there appeared to be little around. This program successfully does that

It also can record the data in the Serial Monitor

Opening port
Port open
------------------------------------
Temperature
Sensor:       DHT22
Driver Ver:   1
Unique ID:    -1
Max Value:    125.00°C
Min Value:    -40.00°C
Resolution:   0.10°C
------------------------------------
------------------------------------
Humidity
Sensor:       DHT22
Driver Ver:   1
Unique ID:    -1
Max Value:    100.00%
Min Value:    0.00%
Resolution:   0.10%
------------------------------------

==============================
Running firstWeatherReport.ino
==============================

Current humidity = 888.8%
Current temperature = 88.8°C
Current temperature = 88.8°F

Current humidity = 63.7%
Current temperature = 27.1°C
Current temperature = 80.8°F

Current humidity = 63.7%
Current temperature = 27.1°C
Current temperature = 80.8°F

Current humidity = 63.9%
Current temperature = 27.1°C
Current temperature = 80.8°F

or write it to an Excel Spreadsheet using the PLX-DAQ macro.

180218-ExcelOutput.png
180218-ExcelOutput.png841×767 67.3 KB

This is the circuitry I used
180216-FirstWeatherStation-Circuit.png
180216-FirstWeatherStation-Circuit.png640×594 50.2 KB

The code is too big to insert in-line so it is attached.

There is no claim that this is the best or the right way do do this. It is just A way that works.

180218-ExcelOutput.png
180218-ExcelOutput.png841×767 67.3 KB

180216-FirstWeatherStation-Circuit.png
180216-FirstWeatherStation-Circuit.png640×594 50.2 KB

firstWeatherReport.ino (10 KB)

2

If you log to SD it helps to start every line with a time-stamp in ASCII hex which can be read into binary quick (interpreting decimal to binary takes way longer) and always takes 8 chars, the lines left-justify evenly on hex time stamps. With Arduino, the time can be microseconds if desired and you can cover > 1 hour intervals.

Logging milliseconds is great for tracing out system faults, if every action is time-stamp logged.

Log in comma separated text with a newline (decimal 10) at the end of every line. Close the file at the end of every line to update the SD FAT (file allocation table) so that interruption won't lose the data then reopen the file and continue logging.

What spreadsheet won't take CSV text?

The thing to watch out for is verbose logging choking the serial output buffer which does lead to blocking.
Easiest way to forestall and minimize that is by using the highest Serial speed possible to empty the buffer quickest.

I think that the IDE holds versions of the SPI and SD libraries compatible with itself.

3

Small point, but according to Google (other search engines are available), a "Herkulex DRS-0401 SER0034" is a modular servo, not any kind of OLED.

4

CtrlAltElite:
... a "Herkulex DRS-0401 SER0034" is a modular servo, not any kind of OLED.

Not according to this.

5

But according to this, it isn't an OLED.

6

CtrlAltElite:
But according to this, it isn't an OLED.

SNAFU! ::slight_smile:

7

Well, if that ain't confusing ...... :o

8

I think the web author at DFRobot made a mistake is all.

The display itself is the Wisechip UG-2864ASWIG01.