With the Arduino Nano PLC, logi.cals is launching a low-cost CPU (around 25 euros) for the simplest programming tasks. The solution makes do with extremely limited resources and consists of a small Arduino Nano 3.2 board based on the ATmega328 with 2 KByte SRAM and 1 KByte EEPROM. All inputs and outputs, including the power supply, are pulled out on pin strips. Each of the Arduino's 14 digital pins can be used either as an input or an output. The Nano also has eight analog inputs, each with a resolution of ten bits. The CPU can be programmed either with the Arduino software or using IEC-61131-3-compliant PLC programming languages such as those provided with logi.CAD 3. The I2C data bus or direct communication via 'C blocks' are used to connect the digital and analog input and output signals. The cyclic processing of the PLC program takes place in the logi.µRTS with adjustable cycle time. The CPU can be powered either via a mini-B USB connection, an external 6 to 20 V power supply unit or a regulated external 5 V supply.