We take a look at two relay modules based on the ESP-01, one from Jaycar (XC3804) and the other from Altronics (Z6427). Both can be remotely controlled over WiFi. by Tim Blythman
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Instead of seven segments, this LED display module has 14 segments per character, so it can display letters, digits and even a few symbols. It has a built-in I2C serial interface, allowing popular microcontrollers like the Arduino Uno or Nano to drive it easily. by Jim Rowe