Mini Stoplight (Programmable ATTiny85 Arduino AVR)

thingiverse

This small stoplight operates on an ATTiny85 or other tiny MCU chip. The circuit is straightforward and simple enough for any beginner to assemble. You can power it from a wall adapter (Be careful! I burned out three of them trying), or a suitable battery pack. https://www.youtube.com/watch?v=TxMQSoz34_M Print Settings Rafts: Yes Supports: Yes Resolution: 0.2 - 0.5 Infill: 100% Instructions Print all components and three Panes. If you're not using colored and transparent plastics, color the Panes with non-washable markers. Insert the LEDs and connect them, making room for the circuit board. Place a cut index card between the circuit board and the LED frame to prevent electrical shorts. Upload sample code or your own to your chip of choice. TEST YOUR VOLTAGE BEFORE TURNING ON THE CIRCUIT. In my experience, wall adapters cannot withstand short-circuits for even a tiny amount of time. Always leave the lights running or carefully discharge its terminals with a 10k resistor until the voltage is zero volts. If everything goes well, you can glue in the Panes and secure the Front and Back with screws. Also, add a zip tie to the wires on the inside to act as a strain relief.