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FRC Wiring Introduction

Kevin Smalley (Green

Created on July 3, 2023

Basic introduction to FRC wiring for incoming team members

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Transcript

" The RoboRIO serves as the main control system for FRC robots, providing inputs and outputs for controlling motors, sensors, and other components. "

- ChatGPT

They're just holes for zip ties.

Falcon 500

  • Always in short supply
  • Very costly
  • Created in collaboration with Vex and CTRE
  • Integrated Talon FX brushless motor controller
  • 400W Power @40A 12VDC
  • Simple to connect
  • 12vdc +/- CAN bus
  • Integrated Cooling Port
  • Replaceable Splined Shaft

Power Distribution Hub

Latching WAGO Terminals: Battery Input and High-Current Channels For Battery Input use 18 to 4 AWG Wire, Stripped back ~0.75” (20mm) For High-Current Channels use 24 to 8 AWG Wire, Stripped back ~0.5” (12mm) Flip open the lever with an upward motion. You can open the lever all the way to have it stay open or you can open it half way for quick wire changes.

Turns on/off the mandatory 120Ω for CAN termination. This should only be on if the PDH is the last device in the CAN chain.
  • 3 Low-current channels
    • Supports up to 15A continuous, 20A peak
    • Supports ATM size fuses
  • 1 Switchable low-current channel
    • On/off control useful for LEDs and other indicators
    • Supports ATM size fuses
  • 20 High-current channels
    • All supporting up to 40A
    • Supports ATO size breakers and fuses

ATO/ATC fuse and circuit breakers up to 40 amps can be used in each circuit.

USB-C connectivity USB-to-CAN device allowing for monitoring and updating devices on the CAN bus Update and diagnose faults with the REV Hardware Client

Power Distribution Hub

3. Current Monitoring: The PDH includes built-in current monitoring capabilities, which allows you to monitor the current draw of each connected device. This feature is valuable for diagnosing electrical issues, optimizing power usage, and ensuring that you don't exceed the capabilities of your power source.

4. Protection and Safety: The PDH incorporates safety features to protect your devices and the overall electrical system. These features may include built-in circuit breakers or fuses to prevent excessive current flow and protect against short circuits.

6. Expansion and Modularity: Some PDH models offer expansion capabilities, allowing you to connect multiple PDH units together for larger systems. This modularity makes it easier to scale your robotics project and manage power distribution across a wide range of devices.

1. Inputs: The PDH typically has multiple input ports, allowing you to connect various power sources, such as batteries or voltage regulators. It is often used as a central hub for power in a robotics system.

2. Power Outputs: The PDH has multiple output ports that are connected to the various devices in your robotics system, such as motors, servos, sensors, and other electronic components. These outputs provide regulated power to each connected device.

5. Wiring Organization: One of the primary benefits of the PDH is its ability to simplify wiring. Instead of running multiple individual power wires from your power source to each device, you can connect all the devices to the PDH, reducing clutter and improving the overall organization of your electrical system

Overall, the REV Robotics Power Distribution Hub serves as a central power management solution, simplifying the wiring process, providing regulated power to devices, and enhancing the safety and efficiency of your robotics or electrical system. It is a popular choice among teams and individuals participating in robotics competitions or building complex robotics projects.

Compatibility

As shown, not all motor controllers are the same. All FRC legal motor controllers are compatible with all FRC legal brushed motors. However at the time of this writing only one stand alone motor controller is FRC legal to be used on brushless motors.

List of allowed motors in R501

3.Spark Max

1.Spark

The only stand alone motor controller currently allowed for brushless motors.

Simple to use, PWM only, Screw terminals. Included in KOP for many years.

4.Add-ons

2.Victor SPX

CAN bus enabled motor controller for use with brushed motors.

All have inputs to allow reading of a limit switch or encoder.

List of approved motor controllers in R503

Proper Wire Size

Proper wire size is important for safety. Too small of wire can lead to failures, overheating, and evern fire.

FRC Legal Battery 2022-23

A. Nominal voltage: 12VB. Nominal capacity at 20-hour discharge rate: minimum 17Ah, maximum 18.2AhC. Shape: RectangularD. Nominal Dimensions: 7.1 in. x 3 in. x 6.6 in., +/- .1 in. for each dimension (~ 180 mm x76mm x 168 mm, +/- 2.5 mm for each dimension)E. Nominal weight: 11lbs. to 14.5 lbs. (~5 kg. to 6.5 kg.)F. Terminals: Nut and bolt style