A ESP32-based [Tilt Hydrometer](Tilt Relay to Brewfather

graph LR
    A[Tilt<br/>Hydrometer] --->|Bluetooth LE<br/>iBeacon<br>gravity / temperature| B
    B[ESP32<br/>microcontroller] --->|WiFi<br/>http POST<br/>json| C[brewfather.app]

• Tilt
• Tilt Pro
• BrewFather Custom Stream

The bluetooth signal from the Tilt Hydrometer is not strong enough to get throught stainless fermenters (e.g. kegs) inside a metalic fermentation chamber (e.g. a freezer). This means the default brewfather integration for the Tilts might now work properly without additional hardware.

Several solutions exists but the cheapest one is to use a microcontroller inside the fermentation chamber (e.g. freezer) to listen to the bluetooth signal and then relay it, using more powerful WiFi, to the brewfather app.

• A ESP32 microcontroller

I used a M5StickC. It's main advantage is that it comes pre-installed inside it's own case. It also has a small screen (not really needed for this project) and comes with a short USB cable (more useful to develop than for a permanent installation). Sadly it's now EOL and any supplies are likely be limited.

There is a newer M5StickC Plus model with a larger screen. However it's pricier, does not come with a USB cable and provide no additional/useful features for this project.

A cheaper option is the screen-less Atom Lite but, from other projects, I found it's WiFi antenna is less powerful and you might have issues (from inside a freezer) to connect it to your WiFi network. YMMV.

• Install VSCode
• From VSCode install the PlatformIO extension
• Clone this repository
• Include your own private.h file with your WiFi credentials and your BrewFather Custom Stream URL

#ifndef __PRIVATE_H__
#define __PRIVATE_H__

#define DEFAULT_SSID        "wifi-ssid"
#define DEFAULT_PASSWORD    "wifi-password"
#define BREWFATHER_URL      "/stream?id=XXXXXXXXXX"
#endif

• Build the project
• Deploy to your ESP32 microcontroller

• Tilt Simulator