For all liquid-level-controls, such as an automatic flower watering plant: By means of two electrodes (sheet strips, rust-free wire), which you simply insert in the ground of your flower bed or flower pot, the ohmic resistance of the garden ground or of the soil of the flowers is measured. When the resistance of the soil increases as a result of drought a relay switches, for example, a small water pump.
CONRAD COMPONENTS4016138195736
Price: £14.99 from Conrad Electronic
| Stockist | Price | |
|---|---|---|
| £14.99 | Visit Store |
Let a fan provide cooling through the temperature switch, when a pre-set temperature is exceeded. When the temperature has dropped to the desired level, the fan is switched off again. The relay responds even to slight temperature variations.
This effective LED running light is suitable for many applications for example model construction, advertisement and decoration
This electronic roulette is formed by 10 LEDs arranged in a circle. When the start button is pushed, the roulette starts and a random generator chooses one of the 10 LEDs to be piloted to by the running light. After releasing the button, the speed gradually...