LILYGOTTGO T-Relay ESP32 Wireless Module DC 5V 4 Groups Relay Development Board 4MB Flash WiFi BLE Remote Switch Control

I am very happy with the performance of this little relay board, and it comes with a nice plastic case that I used in my project to help protect the electronics and wiring. Just be sure you buy the one that comes with the little white programming attachment unless you already have one -- it is required to program the ESP32 via the USBC port. My project involved driving 2 24 volt motors and there were some transient voltage spikes I didnt mitigate properly that took out the power regulator I had feeding this board - this board survived the transients so I am really pleased with that! I added some beefy bidirectional TVS diodes to the motors to knock down those spikes and haven't had any issues since.

Om du beställer denna och recenserar den så försvinner den andra beställningen som har USB dongel så resension är ej möjlig !

Running Tasmota32 firmware on it. I only bought the T-Relay not the kit (excludes T-U2T dongle). I did'nt want to wait weeks when shipped from Lilygo CN, its hard to find elsewhere without costing too much. I spent some time to study the schematic and type C pin out. Bought a breakout board "USB 3.1 Type-C Male to Female Test Board with 24 Pins Header Connector" and used an old ESP8266 code burn fixture with CP2102 (USB UART) to upload code. The Type C breakout board exposes all the necessary pins (TX, RX, VCC, GND, EN/Chip-PU, IO0/Boot) to allow me to enter programming mode. A few trial and error (timing ungrounding EN during code upload from Arduino /esptool) and I got the wifi T-Relay firmware from GitHub running on it. Didn't like it and so spent a few minutes to research Tasmota. The firmware that worked for me is the 'tasmota32.factory.bin'. After some configuration, applying the respective template (GPIO to function mapping - relayX, ledblink), its now fully functional. Web API works too! I can use curl/wget/browser to control the 4 relays. This will work nicely as a wifi switch to automate switching my Bluetti EB3a PV input to disconnect, or connect it directly to PV panels (during the day) or to 24V LFP batteries that are being charged during the day to provide power at night. I shooting "hopefully/eventually" for continous off-grid power to power my mini home lab. I already a have a Lilygo T-display (esp32) connected to my Bluetti via bluetooth and is able parse the BLE data to display PV, AC input, Percent charge, AC and DC load in its tiny screen. Once I add Wifi code, I should be able to integrate it with this Tasmota T-Relay to automate managing the PV and AC inputs when the state of charge of EB3A falls a certain threshold. Btw, this was fun challenge for me however the T-U2T dongle I have no doubt definitely will make uploading code much much easier. Btw, I also tried the Tasmota web installer but could't get the timing right so I went with manually flashing with Arduino IDE first (have to compile then upload which is slow) then switched to esptool command line once I figured out the correct arguments (using the previously compiled binaries from Arduino IDE).

Loaded Tasmota in 45sec, took 3 minutes to make it a dusk to dawn lamp controller from NTP server. Nice layout, it's working off a solar battery setup. Only issue is I would like to see an external antenna jack on the esp32.

Really sick and tired of buying low cost electronics that just dies in a year to three years. This relay worked fine when all of a sudden, it no longer does. What's the point of building interesting projects with hardware that won't last.