Every hardware page.

Arduino: The Classic On-Ramp to Electronics Beyond the ESP32: STM32, Teensy, Nordic & Feather Boards Raspberry Pi Pico 2 W: A Microcontroller With Precise Timing The ESP32 Family: A Field Guide for Growers & Makers The ESP8266: The Original Cheap Wi-Fi Chip Which Microcontroller Should I Buy? A Grower’s Buying Guide

A Computer or a Microcontroller? The First Hardware Choice Beyond the Raspberry Pi: Other SBCs & Mini PCs The Raspberry Pi: The Little Computer That Runs the Show

AS7341: An 11-Channel Spectral Light Sensor Anemometer & Wind Vane: Measure Wind Speed and Direction BH1750: A Cheap Digital Light (Lux) Sensor BME280: Temperature, Humidity & Pressure in One Sensor BME680: Temperature, Humidity, Pressure & Gas (VOC) CO2 & Air Sensors: True NDIR vs Fake "eCO2" Cameras & Imaging: ESP32-CAM, Pi Camera, Webcams & IP Cameras Capacitive Soil Moisture Sensor: The Cheap Probe That Lasts DHT22 (AM2302): The Classic Cheap Temp & Humidity Sensor DS18B20: The Waterproof Digital Temperature Probe Dissolved Oxygen Sensors: Oxygen in the Water EC & TDS Sensors: Measuring Nutrient Strength ESP32-CAM: The Few-Dollar Networked Camera Hall-Effect Flow Sensor: Count the Water Through a Pipe Leaf Wetness Sensors: The Key to Disease Forecasting Light & PAR Sensors: Lux, PPFD, DLI, and Spectrum MH-Z19: A Cheap True (NDIR) CO2 Sensor ORP Sensors: Oxidation-Reduction for Water Sanitation PAR / Quantum Sensor: Measure the Light a Plant Uses PMS5003: A Particulate (PM2.5) Air-Quality Sensor Professional Soil Probe: Calibrated VWC, EC & Temperature Rain Gauge: Count Rainfall the Tipping-Bucket Way Raspberry Pi Camera Module: The Quality Vision Path Resistive Soil Moisture Sensor: Cheap, But It Corrodes SCD40: A True CO2 Sensor (Not eCO2) SHT31: The Accurate Temperature & Humidity Sensor Soil Moisture Sensors: Capacitive, Resistive & Tensiometer TSL2591: High-Range Light Sensor for Sun to Shade Temperature & Humidity Sensors: DHT22, SHT31, BME280, DS18B20 Ultrasonic Water-Level Sensor: Read a Tank From Above Water & Chemistry Sensors: pH, EC/TDS, Dissolved Oxygen, ORP Water Flow Sensors: Hall-Effect, Ultrasonic & Pulse Meters Water Level Sensors: Float, Ultrasonic, Pressure & eTape Weather Stations: Rain, Wind & Outdoor Conditions eTape Level Sensor: A Continuous Strip Gauge pH Sensors: Reading Acidity in a Nutrient Solution

Aqara Sensors: Cheap Zigbee Door, Motion & Climate Athom Smart Plug: Pre-Flashed with Tasmota or ESPHome Bluetooth (BLE) Sensors: Govee, Xiaomi, SwitchBot for Growers Shelly Plus 1: A Local-Control Wi-Fi Relay Sonoff Zigbee Dongle: A Cheap Zigbee Coordinator SwitchBot Meter: A Cheap Bluetooth Thermometer You Can Own TP-Link Kasa Smart Plug: Local-Friendly Wi-Fi Switching TP-Link Tapo Smart Plug: Cheap, Popular, Cloud-Leaning Wi-Fi Smart Plugs & Relays: Shelly, Sonoff, Tasmota Zigbee, Z-Wave, Matter & Thread: Low-Power Mesh Devices

A4988: The Classic Stepper Driver Carrier CO2 Controller: Hold a Grow Space at Target CO2 Contactor: The Heavy-Duty Switch for Big Loads DRV8825: The Stepper Driver Step-Up from the A4988 Dosing & Fertigation: Pumps and pH/EC Control Humidistat: Hold a Space at Target Humidity Irrigation Controller: Schedule, Zones, and Fertigation Lighting Controller: Photoperiod, Dimming, and DLI Master Grow-Room Controller: One Brain for the Room Motor Drivers & H-Bridges: Run a DC Motor or Pump PCA9685: 16-Channel PWM & Servo Driver Peristaltic Dosing Pump: Meter Liquids by the Milliliter Pololu Maestro: The Standalone, Scriptable Servo Controller Relay Module: The Board You Wire to a Microcontroller Relays & Contactors: Switch a Load On or Off Servos & PWM Control: Aim, Position & Drive Many at Once Solid-State Relay (SSR): Silent Switching for Heaters & Lights Stepper Drivers: A4988, DRV8825 & TMC2209 Compared TB6612FNG: The Efficient Dual Motor Driver Thermostat: Hold a Temperature with a Heater or Cooler VPD Controller: One Target for the Whole Climate pH/EC Controller: Hold a Nutrient Solution Automatically

Cellular Modem (LTE-M & NB-IoT): Report From Anywhere Cellular for Remote Sensors: LTE-M, NB-IoT & 4G Gateways & Coordinators: The Bridges Between Networks LoRa & LoRaWAN: Long-Range, Low-Power Radio for the Farm LoRaWAN Gateway: The Box That Hears Your Field Nodes Meshtastic: A Private LoRa Mesh for the Farm PoE Splitter: Power & Data Down One Cable Point-to-Point Wi-Fi Bridge: Link Two Buildings RFM95W: The LoRa Radio for a DIY Field Node Wi-Fi for the Farm: Reaching the Greenhouse & Far Buildings Wired Networking: Ethernet, PoE & Fiber for the Farm

Battery Backup & UPS: Ride Through a Power Cut DC-DC Regulators: Buck, Boost & Linear, Explained Lithium Batteries for Field Nodes: LiPo, 18650 & LiFePO4 Pololu Step-Down Regulators (D24V): The Reliable Buck Module Power Supplies & UPS: Clean Power and Surviving Outages Power Supply: The Clean 5V Rail That Stops Brownouts Powering a Field Node: Solar, Batteries & Deep Sleep Solar Charge Controller: Keep a Field Node Alive