1-wire port expander

This device is based on ATtiny13A with closed-source firmware with author's features. It is not DS2450 or its replacement, but it is developed to be possible to use it with a lot of software written for DS2450 (such as OWFS or Linux kernel modules).

Main usage

• digital/analog sensors read
• mosfet/relay control
• alarm systems
• communication

Key features

• 5 true GPIO ports
• device can continuously watch for certain logic state on all ports and set alarm flags
• 1 port with PWM function
• 4 ports with ADC function (up to 12 effective bits)
• device can compare each ADC result with 2 thresholds and set alarm flags
• 1-wire slave to SPI-master bridge

Example of web-interface