Text Book of an Automatic Solar Powered Irrigation Farming System : LAP Lambert Academic Publishing : 9786139931750 : 6139931754 : 04 Dec 2018 : This project present the design and construction of Automatic solar powered irrigation farming system using NE555 Timer, 7404 HEX inverter, Transistor SK100 and Relay, the system will work when two probes which are connected to the circuit are placed/inserted in to the soil, two probes will conduct only when the soil is wet (resistance is low) and they cannot conduct when the soil is dry due high resistance. The voltage is given from the battery connected to the circuit. When the soil is dry it will produce large voltage drop due to high resistance .This is sensed by 7404 Hex Inverter and makes the first NE555 Timer trigger which is configured as Monostable Multivibrator with the help of an electrical signal. When the first NE555 Timer is triggered at Pin 2, it will generate the output at pin 3 which is given to the input of second NE555 timer