My Raspberry Pi Pool Timer Project — Bill of Materials

(Previously I discussed the the why of this project, the parts I selected to build with, setting up the Raspberry Pi itself, the electronic assembly, the mechanical assembly in the backyard, and the Rasptimer software I wrote for it.)

Here’s the project bill of materials, not counting things like that I replaced or improved “while I was it”, but just the ones core to the project:

Item and source Approx. cost Total
1 Raspberry Pi Model B (from Newark) $35.00 $35.00
1 Wi-Pi USB adaptor (from Newark) $16.48 $16.48
1 4 GB SD Card (from Fry’s) $7.00 $7.00
2 Deltrol Relay 267F DPDT (from $14.16 $28.32
1 Power supply 5V and 12V (from Sparkfun) $9.95 $9.95
2 MOSFET 30N06 (from Sparkfun) $0.95 $1.90
2 10K resistors (bought bag of 10 from Sparkfun) $0.95 $0.95
2 1N4001 diode (from Sparkfun) $0.15 $0.30
1 Prototyping board (from Sparkfun) $2.95 $2.95
1 Aluminum enclosure (similar to this from Fry’s) $20.69 $20.69
1 Plastic enclosure to keep Wi-Pi out of the metal box and protected from weather (similar to this from Fry’s) $7.99 $7.99
1 Terminal wire connectors (from Lowe’s) $2.06 $2.06
1 micro-USB chord (from Fry’s) $1.99 $1.99
1 USB extension chord (from Fry’s) $3.29 $3.29
1 Custom front panel for control box (from Advantage Metal Products) $20.00 $20.00
Various little odds and ends, like a few feet of 16-gage stranded wire, soldering material, screws, bolts, nuts $5.00
Total: $163.87

Not a bad price. I note that Leslie’s sells mechanical timers for pump control at $77.99 each. If I had used those, I also would have had to pay for the custom faceplate, and the total would have been $175.98, which is slightly more. But with none of the goals that I set out for the project, like remote control, or adaptive scheduling.

Now all that’s left to do is to create a video showing the system in action…

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