It’s still technically a relay, but it uses a PIC microcontroller to decide when ... the firmware source code), but he gives enough information that it shouldn’t be too hard to spin up your ...

The 8051 based microcontroller AT89S52 reads data from a DS18B20 digital temperature sensor and activate/deactivate a relay according to the temperature ... alarm trigger EEPROM fields to hold system ...

These switches are old fashioned and expensive, so [Stynus] built this decade resistance box that uses a microcontroller and a series of relays to switch the resistors. Simply selecting a ...

I was also deeply impressed by the wealth of information in these articles and decided ... It is the same THD Analyzer, but now controlled by relays and a STM8S105C6 microcontroller. Such an ...