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Full machine-readable index: https://core-electronics.com.au/llms.txt # Adafruit PCF8591 Quad 8-bit ADC + 8-bit DAC - STEMMA QT / Qwiic **Type:** Product page · **SKU:** ADA4648 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia) **Page:** https://core-electronics.com.au/adafruit-pcf8591-quad-8-bit-adc-8-bit-dac-stemma-qt-qwiic.html ([markdown](https://core-electronics.com.au/adafruit-pcf8591-quad-8-bit-adc-8-bit-dac-stemma-qt-qwiic.html.md)) Measuring voltage and adjusting it is what electronics is all about so you won’t get far without friends like the Adafruit PCF8591 Quad 8-bit ADC + 8-bit DAC combo. Analog to Digital Converters help by measuring an analog voltage and turning it into something a microcontroller like a Metro or Arduino can understand ## Pricing - **Price:** $12.55 (inc GST) — $11.41 AUD, exc GST - **Quantity discounts:** 10+ $11.06 (exc GST) · 50+ $10.84 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 1 today, and up to 500 more in 8–12 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA4648:1` (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/ADA4648:1.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 Measuring voltage and adjusting it is what electronics is all about so you won’t get far without friends like the Adafruit PCF8591 Quad 8-bit ADC + 8-bit DAC combo. Analog to Digital Converters help by measuring an analog voltage and turning it into something a microcontroller like a Metro or Arduino can understand. If you’re using a single board computer like a Raspberry Pi, you might not have any other way to measure a voltage because even though they are well equipped for digital circuits, many boards of that type don’t have any pins that can measure analog voltages. The PCF8591 is not the highest quality ADC/DAC - with only 8 bits of measurement, but it works well and is fairly inexpensive so for many basic uses it will work just fine. Adding a PCF8591 to your electronics project will give you not one, not two, but *four* 8-bit analog inputs that you can use to measure voltages from. If knobs are just the thing to complete your project, just add a PCF8591 and some potentiometers and you’re ready to twist, turn, twiddle and tweak to get things *just right.* Along with four 8-bit ADC channels, the PCF8591 comes complete with an 8-bit Digital to Analog Converter converter as well! Not only can you measure voltages, but now you can *create* them just as you want them. You can even use the DAC and ADC together to create an input to a circuit and measure the results with the ADC. The possibilities abound! *Wow!*” you say, ”*That sounds great, but surely with all that fun in one small package, I can only use one at a time*.” Well, my friend, I’ve got good news. On the back of each PCF8591 breakout are three jumpers that allow you to set the I2C address, allowing the use of eight PCF8591s on the same I2C bus! That’s up to a a whopping 32 channels of analog measurement and 8 channels of analog signal generation! If you do decide to go all out with your project, you won’t break the bank because the PCF8591 breakouts are reasonably priced compared to some higher-end ADCs. As if 4 ADCs and one DAC in a single package weren’t enough, Adafruit have made it even easier to use by mounting the PCF8591's chonky SO16 surface mount package onto a breakout with standard 0.1”/2.54mm headers and [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, making it simple to integrate with your project. [Using the wiring diagrams and example code on the pages that follow](https://learn.adafruit.com/adafruit-pcf8591-adc-dac/overview), you’ll be able to use Adafruits [Python](https://github.com/adafruit/Adafruit_CircuitPython_PCF8591) and [Arduino](https://github.com/adafruit/Adafruit_PCF8591) libraries to easily measure as many voltages as you need (as long as that number is 32 or less). **Technical Details** - Product Dimensions: 25.4mm x 22.8mm x 4.6mm - Product Weight: 2.5g ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/a/d/ada4648-1.jpg)