I have acquired a mini water pump (5V 1.0A) and several solar panels (each: 5V 200mA). What I try to achieve is to pump water from a container above a vertical hydroponic system and let it flow down back to the container while watering the plants inside. I want to pump the water only for ca. 3-5 minutes each hour during the day. Pumping non-stop during the whole day is not good for plants and unnecessarily wear out the pump. What is the simplest/cheapest way to interrupt the pump most of the time and power it only for 3-5 minutes during the daylight?