diff --git a/modular-recipes/repos/minimal_hydroponics_setup/controller.toml b/modular-recipes/repos/minimal_hydroponics_setup/controller.toml
new file mode 100644
index 0000000..2506900
--- /dev/null
+++ b/modular-recipes/repos/minimal_hydroponics_setup/controller.toml
@@ -0,0 +1,15 @@
+[outputs.controller]
+comments = """Lots of room for variation here.  This reference design is a Pi with a simple timer app to turn the lights and pump on and off on a fixed schedule."""
+
+[inputs]
+raspberry_pi = {}
+micro_sd_card = {}
+pi_power_supply = {}
+pi_enclosure = {}
+
+[dependencies]
+operator = {skills=["vendor interaction"]}
+
+[action]
+process = """Flash the MicroSD card with Raspberry Pi OS Bookworm.
+Put everything together."""
diff --git a/modular-recipes/repos/minimal_hydroponics_setup/micro_sd_card.toml b/modular-recipes/repos/minimal_hydroponics_setup/micro_sd_card.toml
new file mode 100644
index 0000000..fd31680
--- /dev/null
+++ b/modular-recipes/repos/minimal_hydroponics_setup/micro_sd_card.toml
@@ -0,0 +1,10 @@
+[inputs]
+capital={quantity={amount=20.00, unit="USDollar"}}
+
+[dependencies]
+operator = {skills=["vendor interaction"]}
+
+[action.purchase]
+vendor = [
+    "https://www.sparkfun.com/kingston-canvas-go-plus-64gb-microsd-card-with-adapter.html"
+]
diff --git a/modular-recipes/repos/minimal_hydroponics_setup/minimal_hydroponics_setup.toml b/modular-recipes/repos/minimal_hydroponics_setup/minimal_hydroponics_setup.toml
index 106a42d..3b462cd 100644
--- a/modular-recipes/repos/minimal_hydroponics_setup/minimal_hydroponics_setup.toml
+++ b/modular-recipes/repos/minimal_hydroponics_setup/minimal_hydroponics_setup.toml
@@ -7,6 +7,7 @@ tasmota_power_outlet = { quantity = { amount=2 } }
 hose_1_inch = { quantity = { amount=1, unit="Meter" } }
 hose_1_2_inch = { quantity = { amount=1, unit="Meter" } }
 nutrient_solution = { quantity = { amount=5, unit="Liter" } }
+controller = {}
 
 [dependencies]
 operator = { skills=["assembly"] }
diff --git a/modular-recipes/repos/minimal_hydroponics_setup/pi_enclosure.toml b/modular-recipes/repos/minimal_hydroponics_setup/pi_enclosure.toml
new file mode 100644
index 0000000..a7302c7
--- /dev/null
+++ b/modular-recipes/repos/minimal_hydroponics_setup/pi_enclosure.toml
@@ -0,0 +1,10 @@
+[inputs]
+capital={quantity={amount=10.00, unit="USDollar"}}
+
+[dependencies]
+operator = {skills=["vendor interaction"]}
+
+[action.purchase]
+vendor = [
+    "https://www.sparkfun.com/raspberry-pi-5-case-red-white.html"
+]
diff --git a/modular-recipes/repos/minimal_hydroponics_setup/pi_power_supply.toml b/modular-recipes/repos/minimal_hydroponics_setup/pi_power_supply.toml
new file mode 100644
index 0000000..95f7b2f
--- /dev/null
+++ b/modular-recipes/repos/minimal_hydroponics_setup/pi_power_supply.toml
@@ -0,0 +1,10 @@
+[inputs]
+capital={quantity={amount=12.00, unit="USDollar"}}
+
+[dependencies]
+operator = {skills=["vendor interaction"]}
+
+[action.purchase]
+vendor = [
+    "https://www.sparkfun.com/raspberry-pi-27w-usb-c-pd-power-supply-white.html"
+]
diff --git a/modular-recipes/repos/minimal_hydroponics_setup/raspberry_pi.toml b/modular-recipes/repos/minimal_hydroponics_setup/raspberry_pi.toml
new file mode 100644
index 0000000..3788c24
--- /dev/null
+++ b/modular-recipes/repos/minimal_hydroponics_setup/raspberry_pi.toml
@@ -0,0 +1,10 @@
+[inputs]
+capital={quantity={amount=50.00, unit="USDollar"}}
+
+[dependencies]
+operator = {skills=["vendor interaction"]}
+
+[action.purchase]
+vendor = [
+    "https://www.raspberrypi.com/products/raspberry-pi-5/?variant=raspberry-pi-5-2gb"
+]