This is another application of using a tiny Solar Engine. Gather all the solar panels from small toys you have discarded and you can drive a small air pump to keep small prawns in a fully enclosed ecosystem.
Great for primary or secondary school classroom projects. Please do not put fish in it, I have’t try it but I don’t think it will work because fish need more foods than prawns. Prawns can also graze on the plants plants give out oxygen and the eco system is easily maintain.
Hints on Howto do it:
You need a Brainchild solar engine package
5 extra Super Capacitors
Small Discharge capacitor needs to be change to ….uF
A portable 3 V DC air pump (one of those you take to fishing trip to keep fish alive in a bucket, this took me a while to find the right one)
You need a xxxxxx 3V DC portable fish pump. Let me look it up again.
P.S. All the solar Panels must be able to charge to 4-5 Volts. If one is charging to a low voltage. The voltage of the voltage trigger of 4.5 V can not be reach and the pump will not work.
Post time: Jul-16-2017