In line with RickLloyd24’s beer monitor challenge write-up, you possibly can monitor the quantity of beer left in a keg through movement measurement or by the burden of the keg. Movement measurement techniques are usually cheaper at round $500 for six faucets, whereas weight setup are costlier at round $1,000 for 5 faucets.

Movement measurement techniques are arguably inferior, as they should be cleaned repeatedly. One might additionally see the extent being thrown off if a pour was missed for no matter motive.

RickLloyd24’s system measures beer ranges on 5 faucets for round $100, utilizing the superior keg weight methodology. It could actually calculate the quantity of liquid in ounces, and as by way of 12-ounce glasses.

The system runs on an ESP32 breakout board, which takes enter from 5 pressure gauges through HX711 load cell amplifiers, giving the present keg weight and thus beer quantity. This info is output on a VGA monitor, managed straight by the ESP32’s pins and a breakout module.

Person enter is through a PS/2 keyboard, which additionally interfaces with the ESP32’s pins, and a resistor setup is used to compensate for the keyboard’s 5V operation (versus the ESP32’s 3.3V requirement). Utilizing a VGA monitor cuts down on the value of the challenge, as they’re available inexpensively or free on the used market. Nonetheless, the PS/2 keyboard generally is a bit more durable to seek out.

The system can take enter from a number of temperature sensors as properly, permitting it to cycle energy to a beer keg-modified freezer, AKA “keezer,” through a relay. This retains beer chilly, however not frozen.

It makes use of a second ESP32 breakout for Wi-Fi transmission, enabling electronic mail and textual content message notifications. Port forwarding is even applied for worldwide beer monitoring! Additional code and {hardware} info is obtainable on GitHub.