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February 5, 2016 AT 4:00 am

Improved Hot Tub Controller #piday #raspberrypi @Raspberry_Pi

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From The Raspberry Pi Hobbyist:

The original version of my hot tub controller starting having some problems which ended up being caused by an animal chewing through the control cables. I never liked having that huge bundle of cables running all the way across the back of the house, so I now have a new controller in a waterproof enclosure mounted right next to the hot tub.

The controller is built to mount on top of a Raspberry Pi and does the following:

● Monitor the water temperature

● Turn a circulation pump and heater on to heat the water as needed

● Respond to buttons that increase/decrease the desired temperature

● Respond to buttons that turn the water jets on and off

● Display the current temperature

● Detect various failure modes and place system in safe mode

● Listen for commands from a smart phone app to control hot tub

● Upload data periodically to an Internet of Things service

Read more


Featured Adafruit Products!

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Waterproof DS18B20 Digital temperature sensor + extras: This is a pre-wired and waterproofed version of the DS18B20 sensor. Handy for when you need to measure something far away, or in wet conditions. While the sensor is good up to 125°C the cable is jacketed in PVC so we suggest keeping it under 100°C. Because they are digital, you don’t get any signal degradation even over long distances! These 1-wire digital temperature sensors are fairly precise (±0.5°C over much of the range) and can give up to 12 bits of precision from the onboard digital-to-analog converter. They work great with any microcontroller using a single digital pin, and you can even connect multiple ones to the same pin, each one has a unique 64-bit ID burned in at the factory to differentiate them. (read more)


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Adafruit 0.56″ 4-Digit 7-Segment Display w/I2C Backpack – Blue: What’s better than a single LED? Lots of LEDs! A fun way to make a small display is to use an 8×8 matrix or a 4-digit 7-segment display. Matrices like these are ‘multiplexed’ – so to control all the seven-segment LEDs you need 14 pins. That’s a lot of pins, and there are driver chips like the MAX7219 that can control a matrix for you but there’s a lot of wiring to set up and they take up a ton of space. Here at Adafruit we feel your pain! After all, wouldn’t it be awesome if you could control a matrix without tons of wiring? That’s where these adorable LED matrix backpacks come in. We have them in two flavors – a mini 8×8 and a 4-digit 0.56″ 7-segment. They work perfectly with the matrices we stock in the Adafruit shop and make adding a bright little display trivial. (read more)


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