There was a time when building electronics and building software were two distinct activities. These days, almost any significant electronic project will use a CPU somewhere, or — at least — could.

Here is a useful circuit for Arduino lovers and experimenters. It is a simple digital voltmeter, which can safely measure input dc voltages in 0 to 30V range. The Arduino board can be powered from a ...

#define REG_OUT_DEFAULT_VAL ((REG_WR_OC_DEFAULT_VAL << 8) | REG_WR_IO_DEFAULT_VAL) #define REG_DIR_DEFAULT_VAL (0xFFFUL) #define REG_WR_SET_BIT_IO_OE (1 << 0) #define ...

IO_EXPANDER_PIN_NUM_0 = (1ULL << 0), IO_EXPANDER_PIN_NUM_1 = (1ULL << 1), IO_EXPANDER_PIN_NUM_2 = (1ULL << 2), IO_EXPANDER_PIN_NUM_3 = (1ULL << 3), IO_EXPANDER_PIN ...