Plug in your TankSync hub or transmitter via USB, pick the right
board below, and click Install. No esptool, no Python,
no command line — your browser does the flashing through WebSerial.
Browser not supported. Web flashing requires Chrome, Edge,
or another Chromium-based browser on a desktop. Firefox and Safari don't
yet support WebSerial. If you're on iOS, use a desktop to flash; the
board only needs flashing once.
Receiver Hub
The brains — the wall-mounted box with the OLED display and LoRa radio.
Board: ESP32 DevKit v1 (CP2102)Size: ~1.4 MB
checking releases…
Your browser doesn't support WebSerial. Use Chrome, Edge, or another
Chromium-based desktop browser.
~45 sec to flash · A pop-up dialog will appear to flash
Connect
Erase
Write
Verify
Waiting for board…0:00
⚠ GPIO2 strapping caveat. If you've already wired up a
buzzer to GPIO2, disconnect the signal wire before
flashing — GPIO2 is a strapping pin and a buzzer holding it low can
keep the chip in download mode. Reconnect after flashing completes.
OTA updates don't have this issue, only first-time USB flashing.
What to expect when you click Install
Browser asks to connect to your board. Pick the USB-serial port that matches your DevKit (usually cu.SLAB_USBtoUART on macOS, COM3+ on Windows).
Install dialog opens. Click Install, leave "Erase device" checked for first install / unchecked for upgrade, then confirm.
Flashing runs ~45 sec. Don't unplug. We show a success card below with next-steps once done.
If your DevKit doesn't appear, you may need the CP2102 driver: Silicon Labs CP210x
After flashing, the hub boots into AP mode — connect to TankSync-XXXX Wi-Fi and visit http://192.168.4.1 to set it up
Transmitter (per tank)
The sensor — mounts above each water tank, talks to the hub over LoRa.
Board: ESP32-C3 SuperMiniSize: ~940 KB
checking releases…
Your browser doesn't support WebSerial. Use Chrome, Edge, or another
Chromium-based desktop browser.
~30 sec to flash · A pop-up dialog will appear to flash
Connect
Erase
Write
Verify
Waiting for board…0:00
What to expect when you click Install
Browser asks to connect to your board. The C3 SuperMini uses native USB-Serial — no driver needed.
Install dialog opens. Click Install, then in the next step leave "Erase device" checked for first install, unchecked when upgrading.
Flashing runs ~30 sec. After success: hold the BOOT button for 2 seconds to enter pair mode.
The ESP32-C3 SuperMini uses native USB-Serial/JTAG — no driver needed
One TX per tank: flash multiple TXes from the same browser tab, one at a time
Receiver Hub (S3 variant)
ESP32-S3 SuperMini build — coming in the next OTA cycle.
Board: ESP32-S3 SuperMiniStatus: building
The S3 build is feature-identical to the DevKit version but uses native
USB-Serial/JTAG and a smaller footprint. Publishing in the next firmware cycle.