Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

Open source Programmable Logic Controller

You maybe heard about PLC (Programmable Logic Controllers). They are usually common in industry where automation of processes is needed. PLCs are expensive and probably hardly affordable to hobby level enthusiasts. They normally come with software packages where you can build control processes using building blocks like Lego. Want one? Well nobody told told that you cannot build one. Take a look at open source PLC project that tries to make these things accessible for everyone. It is based on AT91SAM7S256 microcontroller with 256kB of Flash, 64kB of SRAM and 8kB of EEPROM. PLCs are usually pretty same microcontroller boards with “hardened” I/Os. First of all PLC is designed to be powered from 24V DC (optionally can be configured from 12V). it has 10 digital inputs with LED indicators. 8 outputs are paired with NPN transistors in open-collector configuration capable of sinking 200mA each. And four 10-bit analog inputs rated at 10V. The PLC controller is split in to several boards for better assembly and maintenance. There is a separate CPU board that carries MCU, communication interfaces like RS232, RS485,… Continue reading