Ludwig Behm lbehm

Prometheus Water Meter

This is a fairly involved process as it seems that no one currently makes a pre-made product that measures water usage from a household meter.

It took quite a while to set up due to WiFi issues and the flow rate code still needs some work as the output is semi-random at the moment.

If you get stuck anywhere I'm happy to answer questions provided this doesn't go viral 😂

DFRobot Beetle ESP32 microcontroller (https://www.littlebird.com.au/products/beetle-esp32-microcontroller)
Water meter pulse probe for the specific meter model (https://www.aquatrip.com.au/accessories is one of the only places I've found that sells them)

	#include <stdio.h>

	#define SQ(x) (x)*(x)

	#define M0(x,y) SQ(x)+SQ(y)<4?0:0xe0
	#define M1(x,y,x0,y0) (SQ(x)+SQ(y)<4)?M0(SQ(x)-SQ(y)+(x0),2(x)(y)+(y0)):0xc0
	#define M2(x,y,x0,y0) (SQ(x)+SQ(y)<4)?M1(SQ(x)-SQ(y)+(x0),2(x)(y)+(y0),x0,y0):0xa0
	#define M3(x,y,x0,y0) (SQ(x)+SQ(y)<4)?M2(SQ(x)-SQ(y)+(x0),2(x)(y)+(y0),x0,y0):0x80
	#define M4(x,y,x0,y0) (SQ(x)+SQ(y)<4)?M3(SQ(x)-SQ(y)+(x0),2(x)(y)+(y0),x0,y0):0x60
	#define M5(x,y,x0,y0) (SQ(x)+SQ(y)<4)?M4(SQ(x)-SQ(y)+(x0),2(x)(y)+(y0),x0,y0):0x40

	# If you, like me, have all of your various source-code-like projects in ~/src/
	# this is how to give yourself per-project shell history.
	#
	# I wish I'd done this years ago.
	#
	# First, in your .bashrc file, you redefine the cd, pushd and popd builtins to be "do the builtin bit,
	# then do one other thing (set_src_history.sh, below) like so:


	cd () {