Project 1 Hello XGO

Ⅰ. Teaching Aims

1. Verify whether the communication between MicroBlocks and XGO-lite is normal and complete the power-on initialization.

2. Recognize and be able to use the three most basic “system blocks”.

3. Be able to invoke 1 ~ N built-in actions and insert appropriate waiting times based on their duration.

4. Understand the role of XGO reset pose in the “posture baseline” to pave the way for follow-up experiments.

Ⅱ. Pre-class Check

• XGO + Foxbit + MicroBlocks IDE.

• XGO battery power ≥ 60 %.

• MicroBlocks status bar shows a green dot, and the development board model is Foxbit.

• In Library → Robot, tick XGO-lite. If there are no XGO blocks, please restart the software or reload the extension.

Ⅲ. Key Blocks Analysis

Functions	when started Execute the script immediately after downloading
Fallible points	Forgot to put the script at beginning → The program will not work
Functions	XGO init Initialize I2C, servo, and sensors
Fallible points	It will report I2C busy after two consecutive calls
Functions	XGO reset pose The 12 servos return to angle zero
Fallible points	Missing this step leads to overlapping movements and an imbalance in posture
Functions	XGO action "Sit Down" Perform built-in actions
Fallible points	The capitalization should be consistent with that in the drop-down box

Ⅳ. Practice

1. Open a blank script in the workspace.

2. Drag in and assemble the following blocks:

   

3. Click on the green ▶ above the workspace, and the XGO will sit down slowly.

   Online code: Click here

Ⅴ. Test 1: A Single “Sit Down → Stand Up” Loop

Objective: Perform “Stand Up → Sit Down → Stand Up”.

The waiting time (waitMillis) can be fine-tuned by 600 ~ 1200 ms according to the actual speed of the servo.

Online code: Click here

Ⅵ. Test 2: “Sit Down - Stand Up - Sit Down” Loop

Based on test 1, we put on a forever loop and add one more “Sit Down and Stand Up”.

Online code: Click here

The end XGO reset pose prevents the servo from overheating due to prolonged bending.

Ⅶ. Quiz

1. Why is it recommended to put XGO init in the first sentence of almost all scripts?

2. What phenomenon will occur if waitMillis is omitted and the next action is executed immediately after?

3. Both XGO reset pose and Stand Up can make robots stand upright. What is the essential difference between them?

Ⅷ. FAQ

Questions	Possible causes	Solutions
No action was responded, and the serial port reported an error	Forgot XGO init, or USB is not connected.	Plug in the wire again, restart MicroBlocks, and add XGO init to the first line of the script
Got stuck during the movement	Low battery / The servo is blocked by the ground or cables	Charge until the battery power is ≥ 60%, and clear the surrounding obstacles
Cannot stand steadily after sitting down	Forgot XGO reset pose	Add a reset action at the end
“I²C busy” pops up when downloading the script	The old script is still running	First press “Stop”, and then download again