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Full machine-readable index: https://core-electronics.com.au/llms.txt # Monochrome 0.91 128x32 I2C OLED Display - STEMMA QT / Qwiic Compatible **Type:** Product page · **SKU:** ADA4440 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia) **Page:** https://core-electronics.com.au/monochrome-0-91-128x32-i2c-oled-display-stemma-qt-qwiic-compatible.html ([markdown](https://core-electronics.com.au/monochrome-0-91-128x32-i2c-oled-display-stemma-qt-qwiic-compatible.html.md)) These displays are small, only about 1" diagonal, but very readable due to the high contrast of an OLED display. This display is made of 128x32 individual white... ## Pricing - **Price:** $21.85 (inc GST) — $19.86 AUD, exc GST - **Quantity discounts:** 10+ $19.26 (exc GST) · 50+ $18.87 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 24 and Aug 28. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA4440:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ADA4440:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description These displays are small, only about 1" diagonal, but very readable due to the high contrast of an OLED display. This display is made of 128x32 individual white OLED pixels, each one is turned on or off by the controller chip. Because the display makes its own light, no backlight is required. This reduces the power required to run the OLED and is why the display has such high contrast; Adafruit really like this miniature display for its crispness! To make life easier so you can focus on your important work, Adafruit have taken the OLED display and put it onto a breakout PCB along with support circuitry to let you use this little wonder with 3.3V (Feather/Raspberry Pi) or 5V (Arduino/ Metro328) logic levels. **Adafruit have updated the design to add auto-reset circuitry** so that the reset pin is optional, since it speaks I2C you can easily connect it up with just two wires (plus power and ground!). Adafruit have even included [SparkFun qwiic](https://core-electronics.com.au/catalogsearch/result/?q=qwiic) compatible **[STEMMA QT](https://learn.adafruit.com/introducing-adafruit-stemma-qt)** connectors for the I2C bus so **you don't even need to solder!** Just wire up to your favorite micro and read through Adafruit's detailed tutorial with both Arduino and Python/CircuitPython libraries for text and graphics. You'll need a microcontroller with more than 512 bytes of RAM since the display must be buffered. The power requirements depend a little on how much of the display is lit but on average the display uses about 20mA from the 3.3V supply. Built into the OLED driver is a simple switch-cap charge pump that turns 3.3v-5v into a high voltage drive for the OLEDs, making it one of the easiest ways to get an OLED into your project! Please note that OLED displays are made of hundreds of...OLEDs! That means each pixel is a little organic LED, and if it's kept on for over 1000 hours it'll start to dim. If you want to keep the display uniformly bright, please turn off the display (set the pixels off) when it isn't needed to keep them from dimming. ## Technical Details [Datasheet, EagleCAD PCB files, and Fritzing available in the product tutorial](https://learn.adafruit.com/monochrome-oled-breakouts/downloads) Dimensions: - PCB: 20mm x 35mm (0.8" x 1.4") - Display area: 7mm x 25mm - Thickness: 4mm Display details: - Diagonal Screen Size:0.91" - Number of Pixels:128 × 32 - Color Depth:Monochrome (White) - Module Construction:COG - Module Size (mm):46.30× 11.50 × 1.45 - Panel Size (mm):30.00 × 11.50 × 1.45 - Active Area (mm):22.384 × 5.584 - Pixel Pitch (mm):0.175 × 0.175 - Pixel Size (mm):0.159 × 0.159 - Duty:1/32 - Brightness ( cd/m2):150 (Typ) @ 7.25V - Interface:I2C - Display current draw is completely dependent on your usage: each OLED LED draws current when on so the more pixels you have lit, the more current is used. They tend to draw ~15mA or so in practice but for precise numbers you must measure the current in your usage circuit. - This board/chip uses I2C 7-bit address 0x3C ![](https://core-electronics.com.au/attachments/localcontent/RoHS2_2011_65_EU_7356c5574c.svg)![](https://core-electronics.com.au/attachments/localcontent/RoHS2_2015_863_EU_86773f57f9.svg) ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/a/d/ada4440-1.jpg)