hydro alarm

hydro-alarm It is well known that plant growers with a large "collection" have to work very hard in order to prois- and causes pin 13 duce successful results. The watering of p only one job that has to be done and can become time consuming if large numbers of plants are tic" involved. The same is not true of the "doomrgeostten plant where on many occasions it may be f and allowed to run dry. The watering of plants can lants is rectified by diodes D1 and D2 of N4 to be taken low. Since this gate forms the basis of another oscillator, a low level on this input will prevent it from doing its job. When the water level drops lower than the end of the 0 probe pin 13 will be pulled high by R9. The N4 oscillator will now produce an output to the buzzer indicating that the plant requires water. The buzzer tone can adjustment of the 500 k preset. bevaried by is also placed i the pot but A third electrode than 0 or in fact it ending at a higher be aided by electronics, however, and the simpl...