XH-M452 Board Helps Controlling a Cabinet or Room’s Temperature & Humidity


XH-M452 is a board designed to control the temperature and humidity in a room or cabinet. It comes with two relays to control appliances like fans, air conditioners, (de-)humidifiers, or heaters, and ships with a temperature and humidity probe attached to a one meter cable. XH-M452 board specifications: “ST Controller” Relays – 2x SONGLE 10A/250VAC 125VAC relays for temperature control (left) and humidity control (right). Display – 2x LED display for temperature & humidity Sensor 1 meter probe for temperature & humidity Temperature range – -20 to 60°C +/- 0.1°C Humidity range – 0% to 100% RH +/- 0.1% RH Misc – +/- buttons to adjust temperature and humidity; 2x relay status LEDs. Power Supply – 12V via terminal Dimensions – 65 x 55 x 28mm You’ll need to provide a 12V power source for the board, connect an appliance to control the temperature on the left terminals, and an […]

Review of Sonoff RF Bridge, Sonoff 4ch Pro, and Sonoff POW with Sonoff-Tasmota Firmware

Karl here. Today we are going to look at 2 new and one older Sonoff devices. Sonoff RF Bridge – $9.90 433MHz RF to WiFi Bridge Sonoff 4ch Pro – 4 Gang WiFi RF Smart Switch Sonoff POW – Wireless switch with power metering capabilities I spent very little time with the stock firmware on the device. I don’t like the fact that an Internet connection is needed, and I am not in control. As of the time of this writing I found the Ewelink was not configurable enough to meet my needs. There is one feature that is really nice that I could easily see keeping stock firmware. It is the Alexa Skill. It worked. I am also currently reviewing Vobot Smart Alarm Clock with Alexa integration and had no trouble controlling the Sonoff devices with Alexa. But unfortunately I am lazy and want everything automatic so I can’t […]

EDATEC Raspberry Pi 5 fanless case