There are a number of different devices, or boards, that convert from USB to RS232 serial signals. They all carry out, more or less, the same function, the main difference being the choice of IC used to implement the interface. Continue reading USB-Serial interfaces
The ESP8266 module is a TTL “Serial to Wireless Internet” device. The ESP8266 module is a 3 V device, but it’s no wimp. It draws quite a bit of power. In fact, you’ll probably need to make sure that your circuit’s power supply can handle at least 1 amp of current.