CP2102 Low-cost USB to Serial adapter module for Arduino Very low-cost way to add USB capability to an Arduino or other microcontroller. Use to give your own breadboard Arduino USB capability for bootloading or downloading sketches. Note: this board includes access to the DTR signal needed to auto-reset Arduino when downloading to your device.FeaturesRXD/TXD transceiver communication indicatorUSB power supply can be set to 5V or 3.3V, set by solder pad5 x jumper wires
