JD Humanoid by EZ-Robot

• Make sure the computer running ARCx is on JD's Wi-Fi network (AP mode) or on the same network JD joined (client mode).
• If JD does not appear in the address list, type the address by hand. On Windows the scanner only works when that network is set to Private.
• In AP mode the computer has no internet; that is normal. Cloud speech and AI skills need a second connection (Ethernet or the USB Wi-Fi dongle in the box), or put the EZ-B v4 on your home network.

This is a brownout: the servos pull more current than a tired battery can supply and the controller restarts. Charge the battery fully and use the recommended battery for the kit. Slower transitions (a larger delay with fewer steps) also reduce peak current.

Invert the servo on Auto Position's Servos tab rather than re-capturing every frame. If a joint slams when an action starts, the first frame is far from the pose JD is in; add an intermediate frame, or transition into a neutral pose first. Jerky motion improves with fewer steps, a bigger delay and a little ramp.

The gait frames are in the wrong action, or the action is not set to repeat. Walking uses the reserved Forward, Reverse, Left, Right and Stop actions in Auto Position (movement Panel), and a gait needs repeat turned on. If movement commands do nothing at all, that movement action has no frames yet.

Servos holding a pose work against gravity and can hum. Press Release in Auto Position to release every servo, which also lets you pose JD by hand.

The EZ-B v4 uses two circuit boards that work together during start-up. The top board holds the communication processor and Wi-Fi antenna. The bottom board holds the I/O processor, which handles hardware functions such as port control and the start-up sound. At power on, the communication processor starts first and sends start-up commands to the I/O processor; once the I/O processor answers, the EZ-B finishes starting up and plays the start-up sound.

No start-up sound usually does not mean the speaker is broken. More often it is a sign that the I/O processor is not responding. During connection, the communication processor accepts the connection and performs the first part of the EZB handshake, then hands over to the I/O processor, which must return its firmware ID. If the connection log stops at the firmware ID request and no ID comes back, the I/O processor is not responding, which strongly suggests the bottom board is damaged.

The camera may still work, because the top board's communication processor handles the video stream. A working camera only proves the top board is alive, not that the whole EZ-B is healthy.

The usual cause is electrical damage to the I/O system: ports that were shorted, overloaded, or given too much voltage or current. The EZ-B v4's I/O protection has limits and cannot prevent all damage.

No. Auto Position builds animations by posing the robot and pressing Capture, and Servo Animation records movement as it happens. Scripts in Blockly, JavaScript or Python are there when you want to combine moves, speech and sensors into behaviors.

Auto Position stores poses and moves between them, which suits gestures and walking gaits, and it doubles as a movement panel. Servo Animation stores a recording of every servo over time and lets you edit it on a timeline with script points and audio, which suits choreographed performances to music. Many JD projects use both.

Yes. Add a speech to text engine and a text to speech engine, then Autonomous AI or Chat GPT. JD listens through the computer's microphone, answers through its own speaker, and the AI can run JD's Auto Position actions while it talks.

EZ-Robot sells JD on its online store, and it is sometimes available from other online and local retailers. See JD Humanoid at EZ-Robot.com. When buying, confirm what is included (frame parts, servos, controller, battery and charger, accessories) so you know whether anything must be bought separately.