Electronic automatic programmed watering system - uses recorded programme and pulse counting technique to produce two watering duration periods

摘要

The electronic programmed system is designed to control watering of cultivated surfaces without manual intervention. The system uses a logic type programme recorded in a 'dead' memory. The contents of the memory can however, be modified by a simple electrical reprogramming of the integrated circuit memory. The system also uses a ten output shift register of decoded data for a modulo ten pulse input. The system has manual control of progression of the shift register for control of electro valves. This control is successively validated or invalidated by the recorded programme according to operation phase (counting or automatic watering). The system uses a simple switch to choose two previously determined watering periods. The periods are 15 and 30 minutes. The switch is interrogated by the recorded programme.