Dirt cheap hardware is available for developing 8051 microcontroller applications. Such is well suited for students and budget-limited experimenters alike. This minimum system development board kit is ...

Although this circuit connects the DS18S20 1-Wire temperature sensor to a Cypress CY8C26443 PSoC microcontroller, designers can easily adapt it to connect other 1-Wire devices to any microprocessor.

A microcontroller's internal ADC was inadequate to measure its own supply rail, so a circuit using standard discrete components was devised to do this with just one pin of the IC.