This Instructables will show how I recycled an old battery operated weed killer sprayer in to an automatic hydroponic pump, or to pump any light fluid for any purpose.
You will need one used battery operated weed killer sprayer, wash it out with liquid dish soap a couple times, don't want to leave any chemicals in in.
An x-10 universal module.
Some wire for remote switch.
1/8" I.D. length of clear tubing.
A rechargeable 7.2 V battery.
The sprayer is battery operated, it holds 4 AA (6 volts) batteries but never seemed to work great, in this instructable I upgrade the power source to 7.2 volt rechargeable battery, which could be charged with a small solar panel.
I used an x-10 universal module to control the pump. X-10 automation software to run pump 4 times a day at regular intervals.
Step 1: Disasemble the sprayer gun
Locate the screws holding it together, remove them. Pry the bottom open and work towards the top, the top has snap fit bosses on the inside. It will pop open when persuaded enough. Inside we find a small dc motor driven pump, a trigger switch, battery compartment and the spray nozzle. To remove the pump, I cut the wires.
Step 2: Pump nozzle modification
We now can remove the spray nozzle,use a screw driver and pry between the pump housing and the clear plastic nozzle tube and collar. Use care it's all plastic. After you get that off attach a long piece of 1/8"clear tubing.