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Your friend Norbert runs a nursery in a small town. Recently a new industry moved into town and drilled several high-volume wells. This caused Norbert?s well to become inadequate for watering his plants. The well will now deliver only one gallon per minute, but it is capable of maintaining this rate for as long as needed. The well casing holds 60 gallons of water, and his well pump is capable of pumping 5 gallons a minute. Norbert only needs 1000 gallons of water each day, but he needs it all in the late afternoon. He has access to a large cistern. Since all of the well-drillers are extremely busy (Norbert isn?t the only one having this problem), for the time being Norbert is pumping all of the water from his well into the cistern every hour so that he can water his plants every day. Aside from the wear-and-tear on the well pump (from pumping the well dry too often), he is becoming grumpy from lack of sleep. He therefore asks you (the bright young engineer) to help him out. The cistern has three float switches (all active high, in other words, if there is water at the level of the switch the output is a ?1?, otherwise it is a ?0?). One of these switches is close to the bottom, indicating that the cistern is just about empty. Another is at the very top, indicating that it is just about full. The third is (conveniently enough) 50 gallons below the top of the cistern. There is also an identical switch in the bottom of the well to indicate that the well itself is about to go dry. The pump motor has it?s own dedicated power supply, but the controller requires a logic ?1? on a line to start the pump, and a logic ?1? on another line to make it stop. It will not hurt anything to assert either of these lines after the pump controller has started or stopped. Norbert also has some timers left over from his automatic sprinkler system. You decide to be a little conservative, and pump 50 gallons out of the well every hour. You want to design a circuit which has the outputs from the four switches and the output from two timers as inputs. Your circuit will output four signals: the signal to start the motor, the signal to stop the motor, an alarm signal indicating that the cistern is dry, and another alarm signal indicating that it has been an hour since you last pumped and the well is still dry. The timers are configured so that one will output a 1 value ten minutes after the start signal is sent (e.g. after about 50 gallons have been pumped), and the other will output a 1 one hour after the start is sent. You?ll use the first timer output to (help) stop the pump, and the second to start it again. The timers are outside of the scope of this lab, and you expect that Norbert might need to tweak them a little to fine-tune your system. Your logic should be such that the motor is told to start if there is room for 50 more gallons in the cistern, it?s been an hour since you last pumped, and the well is not dry (it should also be smart enough to not start the motor if another part of your circuit is telling the motor to stop, but telling it to start after you just told it to start will not hurt anything). Your circuit should tell the motor to stop once it has been pumping for 10 minutes, if the cistern is about to overflow, or if the well starts to run dry. You should set off the alarm to indicate a dry well if the level in the well is low and it has been an hour since you last pumped. The other alarm should be asserted (active high) if the cistern is below the level of the bottom switch (Norbert will use this to shut down the automatic waterers).

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Mine broke today! From the Scotts web site they say you can email them or call 1-888-270-3714 for replacements parts. I am calling Monday.

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