A simple but flawed idea to make a fixed frequency variable duty cycle oscillator based on a 555
timer and using the push-pull output to drive the RC timing through two routing diodes, a pot and a
series resistor to limit the min/max duty cycle to something sensible at around 9%/91%.
If the diode drops were negligible and the 555 timer output pulled fully up to VCC and down to
Water detector with 4 level stages. Each stage makes the 555 timer to give a supply period for the buzzer. The active buzzer transmits sound with a pause period between 0.5-3 seconds, depending on the level detected.
**Simple timer to control the UV lamp**
Интервал времени, отсчитываемый таймером, 1...99 минут.
Управление тремя кнопками:
***"decade"*** и ***"unit"*** задают значение, соответственно, десятков и единиц минут, короткое (50 мс) нажатие ***"start***" запускает таймер, повторное нажатие устанавливает таймер на паузу, длительное (> 1 сек) удержание ***"start"*** - сброс таймера.
Проект в CooCox п...
This is a small pcb that is designed to be used on an electric go-kart to display a stopwatch, motor RPMs, and cart speed as well as record this data on an SD card with a time stamp for analysis. The project is Arduino based and is ran off of 7-59 VDC or directly from a 5V source through any of the 5V or VIN pins on the data logger shield (this is not a protected input). It is designed to have w...
UV Box timer.
Articles on my blog about it :