USB relay board

This is a new 6-channel USB relay card for switching different appliances, lights, or motors via a USB interface using a computer program. Certain switching sequences can be programmed via computer. The card uses SMD technology, making it an ideal DIY project for beginners and novices. It's also suitable for those who don't always want to control anything with a computer. This can even be done over the internet via a web application. Regarding the SPI connector, it's even conceivable to cascade the relay card with other relay boards. The relays operate at a maximum of 250V AC, with a switching current of 8A (depending on the relays used). Additionally, there are 4 inputs, which are isolated optocouplers and can be polled on a monitor. The AVR emulates a USB RS 232 interface, so this relay card can be easily addressed using terminal programs or other software. The USB driver in the AVR firmware was developed by Objective Development (https://www.obdev.at/products/avrusb/projects-de.html) and released under GPL2. This USB driver allows for the foregoing of very specialized devices and SMD technology. The result is a very compact board measuring 100mm x 85mm. The analog serial port is configured as follows: 9600 baud, 8 data bits, no parity, 1 stop bit, and further handshake. A standard 9-12V power supply is used.