diff --git a/poetry.lock b/poetry.lock
index 2d92d40..e445af7 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -461,6 +461,23 @@ category = "dev"
 optional = false
 python-versions = ">=3.7"
 
+[[package]]
+name = "tqdm"
+version = "4.66.2"
+description = "Fast, Extensible Progress Meter"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
+[package.extras]
+dev = ["pytest (>=6)", "pytest-cov", "pytest-timeout", "pytest-xdist"]
+notebook = ["ipywidgets (>=6)"]
+slack = ["slack-sdk"]
+telegram = ["requests"]
+
 [[package]]
 name = "traitlets"
 version = "5.13.0"
@@ -492,7 +509,7 @@ python-versions = "*"
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.8.1,<3.10"
-content-hash = "66c63e7a7a61bc34880f47e2568e2407f330c2691dabc0dace9aa15f03a97531"
+content-hash = "ba0e7fa989baea42343639637136dd80ce087eb7bfcfb32da50c9ddffc46ad71"
 
 [metadata.files]
 appnope = []
@@ -534,6 +551,7 @@ six = []
 stack-data = []
 syrupy = []
 tomli = []
+tqdm = []
 traitlets = []
 typing-extensions = []
 wcwidth = []
diff --git a/pyproject.toml b/pyproject.toml
index 1f1d0ff..b025eef 100755
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,6 +11,7 @@ python = ">=3.8.1,<3.10"
 numpy = "^1.22.3"
 scipy = "~1.10"
 click = "^8.1.7"
+tqdm = "^4.66.2"
 
 [tool.poetry.dev-dependencies]
 pytest = ">=6"
diff --git a/tantri/cli/__init__.py b/tantri/cli/__init__.py
index 658e50c..3b0d73b 100755
--- a/tantri/cli/__init__.py
+++ b/tantri/cli/__init__.py
@@ -4,15 +4,21 @@ import tantri
 import numpy
 import tantri.cli.input_files.write_dipoles
 import tantri.cli.file_importer
+import tantri.dipoles
 import json
 import tantri.dipoles.generation
 import pathlib
+import tqdm
 
 _logger = logging.getLogger(__name__)
 
 LOG_PATTERN = "%(asctime)s | %(levelname)-7s | %(name)s | %(message)s"
 
 
+POTENTIAL = "electric-potential"
+X_ELECTRIC_FIELD = "x-electric-field"
+
+
 def _set_up_logging(filename):
 	handlers = [logging.StreamHandler()]
 	if filename is not None:
@@ -53,18 +59,84 @@ def cli(log, log_file):
 	type=click.Path(exists=True, path_type=pathlib.Path),
 	help="File with json array of dots",
 )
-def read_files(dipoles_file, dots_file):
-	click.echo("in hello")
-	_logger.info("in hello")
-	_logger.info(
+@click.option(
+	"--measurement-type",
+	type=click.Choice([POTENTIAL, X_ELECTRIC_FIELD]),
+	default=POTENTIAL,
+	help="The type of measurement to simulate",
+	show_default=True,
+)
+@click.option(
+	"--delta-t",
+	"-t",
+	type=float,
+	default=1,
+	help="The delta t between time series iterations.",
+	show_default=True,
+)
+@click.option(
+	"--num-iterations",
+	"-n",
+	type=int,
+	default=10,
+	help="The number of iterations.",
+	show_default=True,
+)
+@click.option(
+	"--time-series-rng-seed",
+	"-s",
+	type=int,
+	default=None,
+	help="A seed to use to create an override default rng. You should set this.",
+)
+@click.option(
+	"output_file",
+	"-o",
+	type=click.File("w"),
+	help="The output file to write, in csv format",
+	required=True,
+)
+@click.option(
+	"--header-row/--no-header-row",
+	default=False,
+	help="Write a header row"
+)
+def write_time_series(dipoles_file, dots_file, measurement_type, delta_t, num_iterations, time_series_rng_seed, output_file, header_row):
+	"""
+	Generate a time series for the passed in parameters.
+	"""
+	_logger.debug(
 		f"Received parameters [dipoles_file: {dipoles_file}] and [dots_file: {dots_file}]"
 	)
 	dipoles = tantri.cli.file_importer.read_dipoles_json_file(dipoles_file)
 	dots = tantri.cli.file_importer.read_dots_json_file(dots_file)
-	for dipole in dipoles:
-		_logger.info(dipole)
-	for dot in dots:
-		_logger.info(dot)
+
+	if measurement_type == POTENTIAL:
+		measurement_enum = tantri.dipoles.DipoleMeasurementType.ELECTRIC_POTENTIAL
+		value_name = "V"
+	elif measurement_type == X_ELECTRIC_FIELD:
+		measurement_enum = tantri.dipoles.DipoleMeasurementType.X_ELECTRIC_FIELD
+		value_name = "Ex"
+
+	_logger.debug(f"Using measurement {measurement_enum.name}")
+	labels = [dot.label for dot in dots]
+	if header_row:
+		value_labels = ", ".join([f"{value_name}_{label}" for label in labels])
+		click.echo(f"t (s), {value_labels}")
+
+	_logger.debug(f"Going to simulate {num_iterations} iterations with a delta t of {delta_t}")
+
+	_logger.debug(f"Got seed {time_series_rng_seed}")
+	if time_series_rng_seed is None:
+		time_series = tantri.dipoles.DipoleTimeSeries(dipoles, dots, measurement_enum, delta_t)
+	else:
+		rng = numpy.random.default_rng(time_series_rng_seed)
+		time_series = tantri.dipoles.DipoleTimeSeries(dipoles, dots, measurement_enum, delta_t, rng)
+	
+	for i in tqdm.trange(num_iterations):
+		transition = time_series.transition()
+		transition_values = ", ".join(str(transition[label]) for label in labels)
+		output_file.write(f"{i * delta_t}, {transition_values}")
 
 
 @cli.command()