Remotely monitor pH, ORP (Oxidation Reduction Potential), and Temperature
More documentation can be found at the OpenSpaMonitor blog.
List of Tools:
List of materials:
Nanode Classic or better with Optiboot loader - Developed by Ken Boak and the London Hackspace
2 - Phidget 1130 ph / ORP adaptors
pH probe with BNC connector (preferably industrial grade probe)
ORP probe with BNC connector (preferably industrial grade probe)
waterproof DS18B20 temperature sensor
4.7K ohm resistor
Bread board or proto board for temperature sensor
5V power supply for Nanode (AC wall adapter or Batteries)
FTDI cable (USB to serial converter to program the Nanode)
Long Ethernet cable or Ethernet over power-line adapter
Waterproof project box
pH 4 and pH 7 reference solution (optional but recommended)
Make the SpaSitter 2.0 for web-based monitoring of water chemistry in swimming pools, hot tubs, aquariums and other bodies of water. We have spent over a year testing the continued use of the pH and ORP (Oxidation Reduction Potential) probes in a hot tub environment. They have remained very accurate and react well to changes in water chemistry. These high quality industrial grade probes are expensive, but they will outlast any cheap commercial monitor. They can also be reconditioned and calibrated as needed. The cheaper 30 dollar pH and ORP probes worked for a couple months, but are not suitable for extended use or hot conditions.
Its easy to use! Drop the sensors into the water and put the electronics in a waterproof project box. Run a Ethernet line out to the monitor and plug it into a power supply.