Arduino MKR 20x4 I2C OLED shield

Name: Arduino MKR 20x4 I2C OLED shield
SKU: 18197
Price: 79.00 USD
Availability: Discontinued
Rating: 3.00 (1 reviews)

(1 Review)

20x4 character alphanumeric I2C OLED shield for Arduino MKR series

Designed by tech-thing in Estonia

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20x4 character alphanumeric I2C OLED shield for Arduino MKR series

What is it? 20x4 character alphanumeric I2C OLED shield for Arduino MKR series. It provides high quality OLED screen to the newest Arduino platform. With 3.3V operation you can power your project fro…

What is it?

20x4 character alphanumeric I2C OLED shield for Arduino MKR series. It provides high quality OLED screen to the newest Arduino platform. With 3.3V operation you can power your project from lithium battery. This is a bright and wide temperature range OLED that works below freezing, making it useful for outdoor applications.

Dimensions: 65 mm x 25 mm x 13.5 mm.
Working voltage: 3.3V from Arduino
Temperature range: -40°C to +80°C
Interface: I2C + Reset line
Controller: SSD1311

This product comes as a soldered MKR shield ready to use. Pictures are for illustration, only the assembled OLED shield will be shipped, Arduino MKR in the pictures is not included.

This shield uses EA OLEDM204-LGA display from Electronic Assembly.

How to use?

Plug it in to your Arduino, install SSD1311.h library. Run example code.

Example code

Schematic

Review Breakdown

Average Ratings

Product: (3.00)

Documentation: (1.00)

Shipping: (4.00)

Communication: (4.00)

Rudi | May 26, 2020

Like the display, but the library is very limited

This is a great looking display, on a nice looking shield specifically designed for Arduino MKR.

Unfortunately, the required SSD1311 library (at https://github.com/n2j7/SSD1311) is very, very limited, and as of now, quite a few functions that the display driver chip itself supports (such as double hight operation) are still on the 'to do' list of the developers of the library... The library documentation is also poor.

Also, unlike many other display libraries, it is difficult to print several elements on the screen in sequence (one needs to provide the exact cursor location for each item so the length of all items should be known and fixed), and also, variables cannot be easily be used to print on the display.

Concerning the last item: after a bit of research, I found the following way to converts float to the "const char *String" that is used by this display library.

1) In the header of the Arduino code, include:

char *dtostrf (double val, signed char width, unsigned char prec, char *sout) {
char fmt[20];
sprintf(fmt, "%%%d.%df", width, prec);
sprintf(sout, fmt, val);
return sout;}

2) In the below code, the float variable "altitude" is then converted to a const char *String named "str" and printed on the OLED

char str[32];
dtostrf(altitude, 4, 2, strc);
Screen.sendString(str, 0, 0);

Hope this saves other people time and frustration....