> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Tiny Code Reader from Useful Sensors

**Type:** Product page · **SKU:** ADA5744 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/tiny-code-reader-from-useful-sensors.html ([markdown](https://core-electronics.com.au/tiny-code-reader-from-useful-sensors.html.md))

The Tiny Code Reader from Useful Sensors is a small, low-cost hardware module that reads QR codes. It's designed to be a simple way to provision a...

## Pricing

- **Price:** $15.15 (inc GST) — $13.77 AUD, exc GST
- **Quantity discounts:** 10+ $13.36 (exc GST) · 50+ $13.08 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Sep 02 and Sep 07.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA5744:1` (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/ADA5744:1.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

The [Tiny Code Reader](https://usfl.ink/tcr) from [Useful Sensors](https://usefulsensors.com/) is a small, low-cost hardware module that reads QR codes. It's designed to be a simple way to provision a system, for example, by providing the Wi-Fi network name and password or providing input when there's no keyboard.

Internally, the Tiny Code Reader bundles an image sensor and a small microcontroller into a single board, but to make it as easy as possible to build into products, the folks at Useful Sensors wanted to hide those implementation details. It returns information about any QR codes it sees over an I2C connection.

The board uses a standard STEMMA QT / Qwiic connector for the I2C interface. If you're using a standard connector, the wire colors are yellow for SCL, blue for SDA, red for 3.3V, and black for GND. **The sensor supports I2C bus speeds of up to 400k baud with 3.3V power; other voltage levels (like, 5V) are not supported.**

The sensor uses an image sensor internally, so you need to make sure that the lens has a clear field of view. It can be mounted in any orientation, which shouldn't affect the code recognition quality. There's a mounting hole for a screw in the top left, and some alternative pads in case you don't want to use a QT connector but want to wire in directly. The edge with these pads is designed to snap off, in case you need to reduce the size of the board further.

[There's even some example code for CircuitPython here!](https://github.com/usefulsensors/tiny_code_reader_trinkey_keyboard)

## Technical Details 

**[Tiny Code Reader Developer Guide](https://usfl.ink/tcr_dev)**

- [Datasheet](https://core-electronics.com.au/attachments/localcontent/TCR-Datasheet_47757f3aa88.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/A/D/ADA5744-1.jpg)