Transistor Lesson

Use a transistor to control a larger current or voltage than the Arduino can handle.  Use the Arduino to control the transistor, and the transistor to control the load. Choose the power supply voltage to match the voltage needed by the external load. Choose the power...

Best Practices for Electronics System: Lesson

System: Use proximity to trigger sound. Proximity Sensor: LiDAR (Light Detection And Ranging) https://www.adafruit.com/product/3317 Arduino Library: https://github.com/adafruit/Adafruit_VL53L0X Reading the LiDAR sensor: Example Code: LiDAR_sensor_readout.ino (Peel the...

High Power LED System

Spreadsheet here, in Excel and Numbers formats: HighPowerLEDWorkshopSpreadsheet   Arduino Uno Pin Current Limits from here. Adafruit 1W White LED. Datasheet from here. 5V 4A Power Supply, here. PN2222 Transistor, here. RGB LED from Adafruit: here. Datasheet...

Socket Wrench Holders

Ever since I learned that 3D printers were at thing, I’ve wanted to do this. I designed a socket wrench holder for 3/8 drive fractional sockets. It will stack with others in this design series. I included the fused filament printer support in the design file so...