Please note, this is an ‘open collector’ driver – it can only be used to connect the load to ground and there will be a 1 Volt (or more) ‘drop’ across the internal transistors. The inputs can be driven by 3.3V or 5V logic. Fits nicely in any breadboard or perfboard.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Electronics — Have the need for speed? This diode might be right for you
Biohacking — Combining HIIT with a Polarized Training Plan
Python for Microcontrollers — Python powered for IoT design week, CircuitPython beta, and millions of thanks… #Python #Adafruit #CircuitPython @circuitpython @micropython @ThePSF @Adafruit
Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !
Is this avalible in a shield for an arduino? Put this in line with an 8 wide DIP switches (or maybe a 16 or 13 pin – so it can be selectivly interfaced with any arduino pin, at some risk of a person flipping the wrong switches) so that it can be disconnected on certain pins and it instantly becomes compatible with almost any arduino shield. Days like this I wish I had a PCB mill…
@andrew, not yet – but stay tuned!
@Andrew, I put a uln2803 on a protoshield together with a mcp23008 and a couple of connection terminals. I use it to drive relays. Works great and saves a lot of Pins!
BTW, I’ve been wondering if you can turn something like this into an H-bridge by adding just a simple resistor and PNP transistor to the high-side. http://www.flickr.com/photos/[email protected]/7847799300/
This has potential frugality advantages since low-side drivers are pretty common and cheap, and pnp transistors are cheap, but high-side drivers or full h-bridges are rarer and dearer.
The demands on the PNP transistor (for gain/etc) are pretty low, since the ULN can provide a lot of base current, and does the voltage conversion…