About This Project
free hot tub and spa pack.
rats nest of wires in spa pack.
spa pack from early 90’s with mechanical thermostat and high limit switch.
High limit switch triggered at 180 degree’s.
thermostat gave me a working range of 140-150.
All tested with a pot on the stove.
mechanical timer. broke. didn’t turn.
decided to tear everything out and use my RPI to control the relays for pumps and heater.
Hot tub was missing filter system, ozone generator and light.
the shut offs were shot also
so went DIY.
Bought intex pool filter for cheap.
drilled hole and installed a shower drain from home depot in tub for filter intake at bottom of tub.
drilled hole and installed swimming pool eye for return.
installed ball valves for all water lines.
Bought a 10w rgb submersable LED spotlight for the tub. I can change the colors with a remote i’ll be placing in a zip-lock bag.
Bought a water purification ozone generator off ebay. probably too powerful for the little tub. but a fraction of the cost of a hot tub ozone generator.
pump motor relay
hot tub light
possibly other lights elsewhere outside.
RPI 2 hardwired under hot tub connected to an 8 err 7 opto-isolated relay board rated for 10a.
I had an issue with low speed not cutting when high speed was triggered with air buttons.
Let the blue smoke out of one of my relays.
RPI gpio was not damaged in the least.
3 dallas one-wire temp sensors.
hot tub temp
high limit temp
water line temp for circulation pump to prevent freezing.
Triggers & Alerts
right now the heater kicks on at 98 and kicks off at 101 when not in use.
If I plan to use i disable those triggers and enable two others for each desired temp.
102 or 103.
when heater is triggered, jet pump is triggered.
when water is flowing the pressure sensor activates the relay for heater.
when filter pump is on, ozone generator is triggered.
so far I have the fliter system scheduled to run for 6 hrs a day and the tub light to turn on every night at 6pm when it gets dark.
Photos of the Project
right now i just got everything hooked up.
pumps are running, heater running, light is on.
just so i can run bleech through the pipes and get it warm to scrub the inside down.
but wiring is a mess of cris-crossing and wire nuts.
Need to take controller out once tub is cleaned and wire it proper like
Also need to mount rpi in it’s enclosure.