Stringing demonstration video

Functions

• LB/KG display and setting
• Pre-Stretch function
• Constant-Pull system
• Knot function
• Tension adjustment manually during tensioning
• Tension calibration
• Stringing timer
• Tension timer
• Tension counter and boot counter
• Detailed recording of tensioning logs
• Pull speed with 9-speed selection

Features

• 0.05LB High Precision
  • Achieved with the Sparkfun HX711 at 94Hz and software version V2.2 and later.
  • DEMO Vides
• Low Power Consumption
  • Uses a DC19V4A power supply. *
• Real-time UPS Redundancy (Uninterruptible Power Supply)
  • Uses 5 x 18650 batteries to ensure at least one complete racquet stringing.
• Compact and Space-Saving
  • Dimensions are approximately 38(L) x 15(W) x 9(H) CM.(excluding clamp head)
• Simple structure, low cost, and easy maintenance
  • All components are easy to source and inexpensive
• High durability
  • Over 1 million tension reliability test cycles have been completed with no hardware failures detected. 1 Million Cycles Video

Function demonstration video

Main Hardware

1. Raspberry Pico H
2. CBX/SGX 1610 ballscrew 200MM sliding table
3. NEMA23 57x56 stepper motor (2-phase 4-wire 1.8° 1.2Nm)
4. TB6600 stepper motor driver
5. NJ5 20KG load sensor (YZC-133)
6. HX711 module (SparkFun)
7. 2004 i2c LCD
8. Wise 2086 bead clip easy head
9. Five-way key module
10. Button
11. Micro switch
12. Active buzzer (active high trigger)
13. Tri-color LEDs
14. An unregulated UPS battery box made of 5 18650 batteries.

Wiring Diagram

The process of making a condensed version.