Small PLC – Open Source Hardware Project

This small brick-type PLC open source hardware project is based on an ARM7 microcontroller from Atmel. The PLC has 10 digital inputs, 8 digital outputs, 4 analog inputs, a real time clock, RS232 port, RS485 port, USB port and JTAG port.

More information and circuit diagrams are available at the above link.

Small Open Source PLC

Small Open Source PLC

Program AT91SAM7S Microcontroller via USB

AT91SAM7S microcontrollers can be programmed via the USB port — no programming device is necessary. This tutorial explains how to program the AT91SAM7S256 microcontroller on a AT91SAM7S-EK evaluation board over the USB port using the SAM-BA in-system programming software from Atmel.

The tutorial includes information on where to download the SAM-BA software from and a video on how to load firmware to the AT91SAM7S microcontroller.