In adding an alternative cutter drive motor (‘spindle’) to an existing cnc machine, an electrically isolated pwm to analogue converter is needed ... directly driving a laser module Three pin 12Vdc ...

A programmable logic ... to-RS-232 converter module. TTL-to-RS-232 converter With Modbus being a free (and open) communication protocol, makers have been using it to easily wire Arduinos to PLCs.

Well, the project presented here is about building a compact Arduino FM Radio with the help of an astonishingly cheap (eBay) radio module ... I2C interface level to a maximum of VCC (3.3 V), so you ...