diff --git a/.gitignore b/.gitignore
index 5d381cc..64b39f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -160,3 +160,5 @@ cython_debug/
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
 
+# Virtual env
+ve/
diff --git a/pnpdevice/__init__.py b/pnpdevice/__init__.py
new file mode 100644
index 0000000..7b192e9
--- /dev/null
+++ b/pnpdevice/__init__.py
@@ -0,0 +1,2 @@
+"Software for controlling a pool and pump device."
+__version__ = "0.1"
diff --git a/pnpdevice/config.py b/pnpdevice/config.py
new file mode 100644
index 0000000..4d74568
--- /dev/null
+++ b/pnpdevice/config.py
@@ -0,0 +1,8 @@
+from starlette.config import Config
+
+config = Config(".env")
+
+DEBUG = config("DEBUG", cast=bool, default=False)
+DATABASE = config("DATABASE_URL", cast=databases.DatabaseURL)
+SECRET_KEY = config("SECRET_KEY", cast=Secret)
+ALLOWED_HOSTS = config("ALLOWED_HOSTS", cast=CommaSeparatedStrings)
diff --git a/pnpdevice/discovery.py b/pnpdevice/discovery.py
new file mode 100644
index 0000000..2792724
--- /dev/null
+++ b/pnpdevice/discovery.py
@@ -0,0 +1,37 @@
+import logging
+import socket
+
+from zeroconf import IPVersion
+from zeroconf.asyncio import AsyncServiceInfo, AsyncZeroconf
+
+LOGGER = logging.getLogger(__name__)
+
+# From https://stackoverflow.com/questions/166506/finding-local-ip-addresses-using-pythons-stdlib/
+def get_ip() -> str:
+	"Get the primary IP"
+	LOGGER.info("Determining IP address")
+	s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+	s.settimeout(0)
+	try:
+		# doesn't even have to be reachable
+		s.connect(('10.254.254.254', 1))
+		ip = s.getsockname()[0]
+	except Exception:
+		ip = '127.0.0.1'
+	finally:
+		s.close()
+	LOGGER.info("IP address seems to be %s", ip)
+	return ip
+
+async def handle(*args):
+	"Handle requests for discovery"
+	ip = get_ip()
+	info = AsyncServiceInfo(
+		"_http._tcp.local.",
+		"pnpdevice._http._tcp.local.",
+		addresses=[socket.inet_aton("127.0.0.1")],
+		port=80,
+		server=ip,
+	)
+	aiozc = AsyncZeroconf(ip_version=IPVersion.V4Only)
+	await aiozc.async_register_service(info)
diff --git a/pnpdevice/main.py b/pnpdevice/main.py
new file mode 100644
index 0000000..b9b5267
--- /dev/null
+++ b/pnpdevice/main.py
@@ -0,0 +1,24 @@
+import argparse
+import asyncio
+import logging
+import pathlib
+
+import pnpdevice.server
+
+LOGGER = logging.getLogger(__name__)
+
+def main():
+	parser = argparse.ArgumentParser()
+	parser.add_argument("-c", "--config", default="/etc/pnpdevice/config.toml", type=pathlib.Path, help="The config file to use.")
+	parser.add_argument("-s", "--simulate", action="store_true", help="When present, simulate the state of the relays")
+	parser.add_argument("-v", "--verbose", action="store_true", help="Enable verbose logging")
+	args = parser.parse_args()
+
+	logging.basicConfig(level=logging.DEBUG if args.verbose else logging.INFO)
+
+	if args.simulate:
+		relays = pnpdevice.relays.RelaysFake(args.config)
+	else:
+		relays = pnpdevice.relays.RelaysFake(args.config)
+		#relays = pnpdevice.relays.RelaysReal(args.config)
+	pnpdevice.server.run(relays)
diff --git a/pnpdevice/relays.py b/pnpdevice/relays.py
new file mode 100644
index 0000000..5b19ac1
--- /dev/null
+++ b/pnpdevice/relays.py
@@ -0,0 +1,110 @@
+import dataclasses
+import logging
+import os
+import pathlib
+import tomllib
+from typing import Dict, List, Union
+
+import tomli_w
+
+LOGGER = logging.getLogger(__name__)
+
+@dataclasses.dataclass
+class Pin:
+	chip: str
+	number: int
+	name: str
+
+@dataclasses.dataclass
+class Relay:
+	pin: Pin
+	name: str
+	state: bool
+
+def _deserialize(data: List[Dict[str, str]]) -> List[Relay]:
+	"Deserialize a list of relays from the config."
+	return [Relay(
+		name=relay["name"],
+		pin=Pin(
+			chip=relay["chip"],
+			number=int(relay["pinnumber"]),
+			name=relay["pinname"],
+		)) for relay in data]
+
+def _serialize(data: List[Relay]) -> List[Dict[str, str]]:
+	"Serialize a list of relays to the config."
+	return [{
+		"chip": relay.pin.chip,
+		"name": relay.name,
+		"pinnumber": str(relay.pin.number),
+		"pinname": relay.pin.name,
+	} for relay in data]
+
+class Relays:
+	"Class for interacting with relays."
+	def __init__(self, configpath: pathlib.Path):
+		self.configpath = configpath
+		try:
+			with open(configpath, "rb") as f:
+				content = tomllib.load(f)
+				self.config = content
+		except Exception as e:
+			LOGGER.info("Unable to load config file: %s", e)
+			self.config = {
+				"relays": [],
+			}
+		self.relays = _deserialize(self.config["relays"])
+
+
+	def chips_list(self) -> List[str]:
+		raise NotImplementedError()
+
+	def pins_list(self) -> List[Pin]:
+		raise NotImplementedError()
+
+	def relay_add(self, chip: str, pinnumber: int, name: str) -> None:
+		self.config["relays"].append({
+			"chip": chip,
+			"name": name,
+			"pinnumber": pinnumber,
+		})
+		with open(self.configpath, "wb") as f:
+			tomli_w.dump({
+				"relays": _serialize(self.config["relays"]),
+			}, f)
+		LOGGER.info("Wrote config file %s", self.configpath)
+
+	def relays_list(self) -> List[Relay]:
+		return self.relays
+	
+	def relay_on(self, name: str) -> bool:
+		raise NotImplementedError()
+
+	def relay_set(self, name: str, state: bool) -> None:
+		raise NotImplementedError()
+
+class RelaysFake(Relays):
+	"Class for fake relays, useful for testing."
+	def chips_list(self) -> List[str]:
+		return ["chipA", "chipB"]
+
+	def pins_list(self) -> List[Pin]:
+		return [
+			Pin(chip="chipA", number=1, name="CON2-P1"),
+			Pin(chip="chipA", number=2, name="CON2-P2"),
+			Pin(chip="chipA", number=3, name="CON2-P10"),
+			Pin(chip="chipB", number=1, name="CON2-P3"),
+			Pin(chip="chipB", number=2, name="CON2-P7"),
+		]
+
+	def relays_list(self) -> List[Relay]:
+		raise NotImplementedError()
+	
+	def relay_on(self, name: str) -> bool:
+		raise NotImplementedError()
+
+	def relay_set(self, name: str, state: bool) -> None:
+		raise NotImplementedError()
+
+class RelaysReal(Relays):
+	"Class for controlling real relays."
diff --git a/pnpdevice/server.py b/pnpdevice/server.py
new file mode 100644
index 0000000..03b8515
--- /dev/null
+++ b/pnpdevice/server.py
@@ -0,0 +1,48 @@
+from fastapi import FastAPI, Request
+from fastapi.templating import Jinja2Templates
+from starlette.responses import RedirectResponse
+
+import jinja2
+
+from pnpdevice.config import config
+import pnpdevice.discovery
+import pnpdevice.relays
+
+app = FastAPI(debug=config.DEBUG)
+templates = Jinja2Templates(directory="templates")
+
+@app.get("/")
+def index():
+	relays = request.app["relays"]
+	return templates.TemplateResponse("index.template.html", {
+		"relays": relays.relays_list(),
+	})
+
+@app.get("/relay/create")
+def relay_create_get(request: Request):
+	"Get the form to create a new relay."
+	relays = request.app["relays"]
+	pins = relays.pins_list()
+	return templates.TemplateResponse("relay-create.template.html", {"pins": pins})
+
+async def relay_create_post(request: Request, chip_and_number: str, name: str):
+	"Create a new relay."
+	chip, number = chip_and_number.partition("-")
+	LOGGER.info("Creating relay %s %s with name %s", chip, number, name)
+	return RedirectResponse(status_code=303, url="/")
+
+async def status(request: Request):
+	return html("Status")
+
+def run(relays: pnpdevice.relays.Relays):
+	"Run the embedded web server"
+	app = web.Application()
+	app["relays"] = relays
+	aiohttp_jinja2.setup(app,
+	  loader=jinja2.FileSystemLoader("templates"))
+	app.on_startup.append(pnpdevice.discovery.handle)
+	app.add_routes([web.get("/", index)])
+	app.add_routes([web.get("/relay/create", relay_create_get)])
+	app.add_routes([web.post("/relay/create", relay_create_post)])
+	web.run_app(app)
+
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..c6ef362
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,27 @@
+[project]
+name = "pnpdevice"
+authors = [
+    { name = "Eli Ribble", email = "eli@theribbles.org"}
+]
+dependencies = [
+    "fastapi",
+    "tomli-w",
+    "uvicorn[standard]",
+    "zeroconf",
+]
+dynamic = ["version", "description"]
+
+[project.scripts]
+pnpdevice = "pnpdevice:main.main"
+
+[project.urls]
+Home = "https://source.theribbles.org/eliribble/pnpdevice"
+
+[project.optional-dependencies]
+dev = [
+    "pre-commit",
+]
+
+[build-system]
+build-backend = "flit_core.buildapi"
+requires = ["flit_core >=3.2,<4"]
diff --git a/templates/index.template.html b/templates/index.template.html
new file mode 100644
index 0000000..cbb0d9d
--- /dev/null
+++ b/templates/index.template.html
@@ -0,0 +1,14 @@
+<html>
+<h1>Pools'n'Pumps Device</h1>
+{% if not relays %}
+  <h2>No relays found.</h2>
+{% else %}
+  <h2>Relays</h2>
+  <ul>
+  {% for relay in relays %}
+  <li>{{ relay.name }}</li>
+  {% endfor %}
+  </ul>
+{% endif %}
+<a href="/relay/create">Create Relay</a>
+</html>
diff --git a/templates/relay-create.template.html b/templates/relay-create.template.html
new file mode 100644
index 0000000..5fa4ddf
--- /dev/null
+++ b/templates/relay-create.template.html
@@ -0,0 +1,12 @@
+<html>
+<h1>Relay Creation</h1>
+<form method="POST" action="/relay/create">
+  <input type="text" name="name" placeholder="Pool Pump 1"></input>
+  <select name="chip-and-number">
+    {% for pin in pins %}
+    <option value="{{ pin.chip }}-{{ pin.number }}">{{ pin.name }}</option>
+    {% endfor %}
+  </select>
+  <button type="submit">Create</button>
+</form>
+</html>