5 🔌 Connect Wires

"Everything is connected." 🤝

5.1. Joint map

Nybble's servos are connected to NyBoard's PWM pins symmetrically and resembles the nerves along the spinal cord. Though Nybble doesn't have shoulder roll DoF, those indexes(4~7) are reserved for the full OpenCat framework.

NyBoard V0_1 and V0_2 have different PWM pin orders, but the physical servo connection remains the same. All adjustments are done in the software.

Use h for head, t for tail, r for shoulder roll joint, s for shoulder pitch joint, k for knee joint, F for front, H for hind, L for left, R for right, the full joints map of OpenCat is:

5.2. Plug in the servos

Observe the indexing pattern to connect servos with correct PWM pins. Be careful with the wires’ direction. The brown wire of servo is GND, while the GND on NyBoard V0_1 are along the centerline. On NyBoard V0_2 they are opposite.

A quick check is that all On NyBoard V0_1 the brown wires should be far away from the board surface. On NyBoard V0_2 the brown wires should be close to the board surface.

For NyBoard V0_2, the location of servo wires will still be the same, but their direction of colors will be opposite

5.3. Wiring

After calibration, troubleshooting and final assembling, It’s time to think about wiring routes to make Nybble look neat. There are multiple slots on the frame designed as wire organizer. Feel free to develop your own style for connecting future accessories. Make sure the wires doesn’t get in the way of servos‘ movement.

Below is my wiring routes.

5.4. Connect Ultrasonic Sensor

If you have not already, plug in the 4 pin cable, make a note of which cable colors are attached to which signals. When looking into Nybble’s eyes, the connections from left to right are:

Connect the other end of the cable to the header you soldered in place earlier in assembly. Use the following mapping

Last updated