USB RS232 Relay
The main objective of this board is to ring an school bell using a PC program written in python.
- This project is the interface of a PC to a Relay using a simple USB RS232 adapter.
- This approach was selected because the parts are easily found in any PC parts store.
- The relay is activated/deactivated using the RTS line of the serial port, any...
RS232 to TTL adapter using MAX233 chip. Includes DTR support so that COM1 on PC can be used to program Arduino from IDE. Optional +- 10V output pins. The TTL output pin layout is similar to the popular FTDI USB TTL serial adapter apart from no CTS support. An external 5V source is required to power this circuit.