2.4 Test Wi-Fi and SD Card

Check List · Step 4 of 12 · Connect to FluidNC WebUI and verify the microSD slot

ℹ️

Objective: confirm that the controller creates its FluidNC access point, that WebUI opens at 192.168.0.1, and that a FAT32 microSD card can be read and written.

⚠️

Before starting: main power must be on and the V4.7B test YAML must load without errors.

📡

Join FluidNC AP

➜

🌐

Open 192.168.0.1

➜

💾

Read / Write SD

1

Connect to the Controller Wi-Fi

Restart the controller and wait about 10 seconds.
Open the Wi-Fi list on the computer.
Join the FluidNC access-point network shown by the controller.
This is a local controller network; it normally has no Internet connection.

💡 Do not leave the controller network just because the computer reports “No Internet.”

2

Open FluidNC WebUI

Open Google Chrome.
Enter http://192.168.0.1.
Confirm the Dashboard, Console and Files pages open.
Leave the page open for a minute and confirm the connection remains stable.

macOS: if the captive.apple.com window says you are disconnected, click Cancel, remain connected to the FluidNC AP, then open Chrome yourself and enter http://192.168.0.1.

3

Insert and Detect the microSD Card

Power off the controller.
Insert a known-good FAT32 microSD card.
Power on and return to WebUI.
Open the Files / SD area and confirm the card appears.

4

Read and Write a Test File

Create or upload one small text or G-code file.
Refresh the list and confirm the filename remains visible.
Download or open it again to verify reading.
Delete the temporary file, then power off before removing the card.

✅

Normal behavior: WebUI stays connected at 192.168.0.1 and the SD file can be uploaded, listed and read back.

🔧 Quick Troubleshooting

If no FluidNC AP appears, restart and wait 10 seconds.
If 192.168.0.1 does not open, confirm the computer is still connected to the controller AP.
If the SD card is missing, power off and reseat it, reformat as FAT32 or try a smaller known-good card.
The test YAML uses MISO GPIO.19, MOSI GPIO.23, SCK GPIO.18 and CS GPIO.5.

✓

Expected Results

The controller access point is visible and the computer stays connected.
FluidNC WebUI opens at 192.168.0.1.
The FAT32 microSD card is detected.
A test file can be written and read back.

← 2.3 Upload Firmware and YAMLStep 4 of 122.5 Test Probe and Input Signals →