[Gardner] put together a simple and cheap ... look quite promising. The project is aimed at Arduino-based circuits, but any chip with an ADC will work. The 555 timer is used as a free running ...

After checking out a few project from the EEV blog 555 contest, [Cody] decided to go with a simple 555 timer circuit. Being a business card, [Cody] kept the circuit very simple; it’s just a 555 ...