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Wouldn't it be cool if, instead of having to give your dog-sitter a key to your place, you could just text your home to let her in? Now we build it ourselves using the new Lockitron body, Metro Mini (tiny Arduino-compatible) and a FONA 800 cellular module. Normally, a Lockitron has a built-in WiFi system for locking & unlocking via their App. Since they have redesigned their enclosure, we now have the 'guts' of the Lockitron available for hacking. There's just enough space inside for some tasty Adafruit electronics
Fire four solenoids, spin two DC motors or step one bi-polar or uni-polar stepper with 1.2A per channel (3A peak) using the TB6612. These are perhaps better known as "the drivers in our assembled Adafruit Motorshield or Motor HAT." We really like these dual H-bridges, so if you want to control motors without a shield or HAT these are easy to include on any solderless breadboard or perma-proto.
The Raspberry Pi is a wonderful little computer, but one thing it isn't very good at is controlling DC Servo Motors - these motors need very specific and repetitive timing pulses to set the position. Instead of asking the Pi Linux kernel to send these signals, pop on this handy HAT! It adds the capability to control 16 Servos with perfect timing. It can also do PWM up to 1.6 KHz with 12 bit precision, all completely free-running.
This project pairs the super-awsome Pixy CMUCam-5 vision system with the high performance Zumo robot platform. Combining the powerful object tracking capabilities of the Pixy camera with the nimble Zumo robot base, you can create a responsive little bot that will chase balls and follow you around like a pet!