#flybackdiode

[adafruit]

Solenoids go clicky-clacky 🔩🔊🤖

We're testing out an I2C-to-solenoid driver today. It uses an MCP23017 expander. We like this particular chip for this usage because it has push-pull outputs, making it ideal for driving our N-channel FETs and flyback diodes. The A port connects to the 8 drivers, while the B port remains available for other GPIO purposes. For this demo, whenever we 'touch' a pin on port B to ground, the corresponding solenoid triggers provide an easy way to check speed and power usage.

[adafruit]

Got lots and lots of solenoids?

We were chatting with a customer and realized we need a better solution for customers with many solenoids or other high-current on/off loads. This breakout will make it easy to control and power many inductive or high-current loads. An mcp23017

https://www.digikey.com/short/nf4pn2rc

expander over I2C provides 8 output pins, each connected to an AO3406 N-Channel FET

https://www.digikey.com/short/rh398zbh

with a 1N4007 flyback diode.

https://www.digikey.com/short/343h9890

Terminal blocks allow for quick wiring to power and each high current output, including one chunky block for the power input. The other 8 expander I/Os are exposed if you want buttons or simple LEDs. The breakouts have stemma QT for fast chaining/control over I2C.

[adafruit]

Desk of Ladyada - Festival of Lights PCB push ✨🎇

Wrapping up last year with display and LED PCB projects, including GC9A01A round display protos and Sparkle Motion boards. Solenoid driver testing underway, fixing WLED/mic interference. Great Search: Picking SOD-323 flyback diodes for solenoids, balancing specs and cost.