SANDER Firmware Flasher

MultiTaction NetBridge-to-USB Touch Bridge

Before You Start

  1. Connect the SANDER device to your computer using the UART USB-C port (the one labelled COM or UART — not the USB-OTG port)
  2. Put the device into flash mode: hold the BOOT button, tap RST, then release BOOT
  3. Click the Install button below
  4. Select the serial port — look for a name containing "USB to Serial" or similar
  5. Wait for flashing to complete — do not unplug the device

S3-Zero (WiFi)

ESP32-S3-Zero N4R2 (4MB flash, quad PSRAM) — production board. Touch data over WiFi.

This board has a single USB-C port. To flash: hold BOOT, tap RST, release BOOT, then click Install and pick the "USB JTAG/serial debug unit" port. After flashing, tap RST to boot.

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Requires Chrome or Edge on desktop (WebSerial API)

DevKitC-1 (WiFi)

ESP32-S3-DevKitC-1 N16R8 (16MB flash, octal PSRAM). Touch data over WiFi. Install via the UART USB-C port (see steps above).

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Requires Chrome or Edge on desktop (WebSerial API)

Ethernet (W5500)

Waveshare ESP32-S3-ETH board. NetBridge touch data over wired Ethernet; WiFi stays for config.

This board has a single USB-C port. To flash: hold BOOT, tap RST, release BOOT, then click Install and pick the "USB JTAG/serial debug unit" port. After flashing, tap RST to boot.

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Serial access was denied. Please allow serial port access and try again.

Requires Chrome or Edge on desktop (WebSerial API)

Setup Guide

Step 1 — Connect to the Device

  1. Unplug the USB cable from your computer and reconnect it
  2. The device LED will pulse red — this means it needs WiFi setup
  3. On your phone or laptop, open WiFi settings and connect to SANDER-XXXX (the last 4 characters are unique to each device)
  4. A setup page should open automatically. If it doesn't, open a browser and go to http://192.168.4.1

Step 2 — Configure WiFi

  1. Enter the WiFi network name (SSID) that your MultiTaction touch source is on
  2. Enter the WiFi password
  3. Click Save — the device will reboot and connect
  4. The LED turns yellow (WiFi connected, searching for display)

Step 3 — Configure NetBridge Connection

  1. Find the device's IP address on your router, or check the SANDER-SETUP page before saving
  2. Open http://<device-ip>/config in your browser
  3. Enter the NetBridge host IP address (your MultiTaction touch source's IP)
  4. Port is 5502 by default — only change if your setup differs
  5. Click Save — the device connects to the display
  6. The LED turns green — touch data is now being relayed

Step 4 — Connect to Host Machine

  1. Unplug the USB cable from your computer
  2. Plug the USB cable into the target host machine (NeatBar, ClickShare, laptop, etc.)
  3. The host will detect a standard USB touchscreen and pen — no drivers needed
  4. Touch the MultiTaction touch source — you should see the cursor move on the host

LED Status Reference

Red pulsing No WiFi connection — needs setup
Yellow solid WiFi connected, no NetBridge connection
Green solid Connected and relaying touches
Blue flash Touch event being sent
White AP mode (setup portal active)

Troubleshooting

LED stays red after entering WiFi credentials

Double-check the SSID and password. The SSID is case-sensitive. Reconnect to the SANDER-XXXX WiFi network and try again. SANDER only supports 2.4 GHz WiFi networks.

LED is yellow but won't turn green

The device can't reach the NetBridge host. Verify the touch source's IP address and that port 5502 is open. The SANDER device and the touch source must be on the same network.

Touch works but cursor is in the wrong position

Open http://<device-ip>/config and check the coordinate transform settings (invert X/Y, swap axes). These depend on how the display is oriented relative to the host screen.

Host machine doesn't detect the USB device

Try a different USB cable (some cables are charge-only). On the DevKitC board, use the USB port (not UART). If the device was just flashed, unplug and reconnect.

How do I update firmware later?

Go to http://<device-ip>/update in your browser, upload the new .bin file, and the device will update over-the-air. No USB cable or this page needed.

Touch Diagnostic Tracer →
Open this on the host machine SANDER is plugged into to visualise incoming touches, pen and eraser in real time.