diff --git a/pnpdevice/main.py b/pnpdevice/main.py
index 872da9e..b9b5267 100644
--- a/pnpdevice/main.py
+++ b/pnpdevice/main.py
@@ -1,6 +1,7 @@
 import argparse
 import asyncio
 import logging
+import pathlib
 
 import pnpdevice.server
 
@@ -8,14 +9,16 @@ LOGGER = logging.getLogger(__name__)
 
 def main():
 	parser = argparse.ArgumentParser()
-	parser.add_argument("-v", "--verbose", action="store_true", help="Enable verbose logging")
+	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()
+		relays = pnpdevice.relays.RelaysFake(args.config)
 	else:
-		relays = pnpdevice.relays.RelaysReal()
+		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
index 3d69d46..5b19ac1 100644
--- a/pnpdevice/relays.py
+++ b/pnpdevice/relays.py
@@ -1,9 +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
index 13abca3..e88b7e7 100644
--- a/pnpdevice/server.py
+++ b/pnpdevice/server.py
@@ -10,17 +10,36 @@ def html(text: str) -> web.Response:
 
 @aiohttp_jinja2.template("index.template.html")
 async def index(request):
-	return {}
+	relays = request.app["relays"]
+	return {
+		"relays": relays.relays_list(),
+	}
 
-async def status(request):
+@aiohttp_jinja2.template("relay-create.template.html")
+async def relay_create_get(request: Request):
+	"Get the form to create a new relay."
+	relays = request.app["relays"]
+	pins = relays.pins_list()
+	return {"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
index b913c3a..9f1e6a4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,6 +6,7 @@ authors = [
 dependencies = [
     "aiohttp",
     "aiohttp_jinja2",
+    "tomli-w",
     "zeroconf",
 ]
 dynamic = ["version", "description"]
diff --git a/templates/index.template.html b/templates/index.template.html
index 2bf74db..cbb0d9d 100644
--- a/templates/index.template.html
+++ b/templates/index.template.html
@@ -1,3 +1,14 @@
 <html>
-	<h1>Pools'n'Pumps Device</h1>
+<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>