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A tiny Tesla Roadster climbs a ramp, hangs upside down and barrel-rolls, all from one hand crank. Here's how the two cam grooves and the capstan make it happen, with a 3D model you can drive yourself.

I recently found the the Freenove ESP32 breakout board, which provides a very simple way to interface an ESP32 Dev Module with sensors and motors.  The reason I especially like this breakout board is you can power it via a DC adapter.  This provides power to the 5V pins of the breakout board and allows for up to 3A of current draw, which means you can pretty easily power multiple servo motors straight from the board.  The breakout board can be found here: Freenove Esp32 Breakout Board: https://geni.us/HWuH Just a quick note: the breakout board only works with the Freenove ESP32 dev modules, which can be found here: Esp32 Wroom: https://geni.us/QBiKeMe Esp32-S3 Wroom: https://geni.us/nwPyZ Connecting the PS4 Controller to the ESP32 is surprisingly...

Below is a basic tutorial to get you started with how to connect four servo motors and an I2C RTC (Real-Time Clock) module to an Arduino Nano. This tutorial shows the necessary hardware, a basic wiring diagram, and code examples. This pairs with the Rack Driven 7 Segment Display Hardware Required 1 × Arduino Nano (https://geni.us/vdx2Pn3) 4 × Servo Motors (https://geni.us/G8ArjNg) 1 × DS3231 RTC Module (https://geni.us/rtKYLJT) External Power Supply (https://geni.us/QwyvCh)  Optional Hardware Breadboard (https://geni.us/2dAJj) Jumper Wires (https://geni.us/n53x) Servo Motors Servo motors are used to control the angular position of an object. They have three pins: VCC (usually red) - Connects to 5V GND (usually black or brown) - Connects to GND Signal (usually yellow or orange) - Receives the PWM control signal from the Arduino...

In this video, I take on one of my most ambitious projects yet—a giant ball roller coaster clock. It all starts with revisiting one of my earlier creations for JBV Creative and deciding to scale it up significantly. I begin by turning on the original sculpture to see if it still works. After anticipating viewer comments suggesting turning this into a clock, I decide to design it as a clock from the beginning. I opt to use larger 30 mm balls instead of the original 6 mm ones, which means scaling up the entire project significantly. The first step is constructing a substantial base to support the enlarged structure. As I progress, I realize I may have underestimated the scale, but...

This mechanism uses 7 pairs of inverse cams to push and pull on a rack and pinion. The pinions are connected to the segments that make up the numbers on the front of the display. As the pinions flip up and down, the number changes according to the positions of the cams.