The best 4-20mA tools and modules: DROK, UCTRONICS and Riiai signal generators, the Fluke 789 ProcessMeter, 4-20mA to 0-3.3V/5V/10V converter modules for Arduino and ESP32, a 0-5V to 4-20mA transmitter, a DIN-rail signal isolator, and 4-20mA level and temperature sensors.
The best PLCs for beginners, makers and small automation projects: Siemens LOGO! 12/24RCE, Arduino Opta WiFi, RS485 and Lite, ESP32-S3 industrial relay controllers, FX1N-compatible PLC boards, PLC+HMI all-in-ones and the Delta DVP14SS, compared by I/O, programming and use case.
The best Modbus relay and I/O modules: Waveshare Modbus RTU RS485 relays, PoE Ethernet relays with Modbus TCP and MQTT (8, 16 and 30 channels), digital I/O and analog output modules, an ESP32-S3 Wi-Fi relay board and a 4-20mA analog input module, compared for PLC, home automation and DIY control.
The best home energy monitors and Modbus energy meters: Emporia Vue 3, IAMMETER DIN-rail Wi-Fi/Modbus meters, Refoss EM16P, Shelly Pro 3EM 120A v2, a CL200 RS485 Modbus sub-meter and PZEM-004T modules for Arduino and ESP32, compared for solar, Home Assistant and DIY projects.
The best RS485/RS232 to Ethernet and Wi-Fi converters and Modbus RTU to TCP gateways: Waveshare PoE serial servers, USR-TCP232-410S, 302 and 306, USR-W610, USR-DR302, Moxa NPort 5110 and MGate MB3180, compared by ports, protocols, mounting and power.
The best Shelly devices: Shelly 1 Mini Gen4, 2PM Gen4, 1PM Mini Gen4 and 1 Gen3 relays, PM Mini Gen3 and Pro 3EM energy meters, Plug US Gen4, Dimmer Gen4, i4 Gen3, H&T Gen3, plus Shelly BLU Bluetooth sensors, buttons, gateway and Flood Gen4, compared for Home Assistant and smart home use.
The best SwitchBot devices: Hub 2 and Hub Mini, the Bot button pusher, Meter Plus and Outdoor Meter, Curtain 3 and Blind Tilt, Lock Ultra and Keypad Touch, Contact, Motion and Leak sensors, Remote, Plug Mini, Pan/Tilt Cam and Air Purifier Table, with how SwitchBot’s Bluetooth, Wi-Fi and Matter pieces fit together.
The best Bluetooth beacons for developers and businesses: Blue Charm BC021, BC011, BC04P, BC05 and USB MultiBeacons, Feasycom FSC-BP104D and BP108B, DX-CP33, plus nRF52840 boards for DIY beacons, compared by protocol, range, battery and sensors.
The best Bluetooth smart buttons and remotes: SwitchBot Bot button pusher and SwitchBot Remote, Flic Smart Button and Flic Twist, Shelly BLU RC Button 4 ZB and BLU Remote Control ZB, GoveeLife mini, double and 6-button controllers, and the CamKix Bluetooth shutter remote.
The best Bluetooth door, window, motion, presence and leak sensors: SwitchBot Contact Sensor, Motion Sensor, mmWave Presence Sensor and Water Leak Detector, Shelly BLU Door/Window ZB, Motion ZB and Flood Gen4, GoveeLife H5123 and motion sensor, and CarLock’s Bluetooth vibration add-on.