Below is a parts list and sources for the DIY Spa or Pool Monitor. There are many different versions of this build that you can put together based on your needs, WiFi, RF, or direct internet connection.
How it Works
An internet connected Arduino (in this case a Nanode) collects the sensor reading and sends them to Xively.com. Xively has built tools to easily access and store your sensor data so you can get it anywhere, your pool monitor displays on your smart phone, or any web connected device. You can build other controls like alerts or connected alarms easily, to help you manage your pool, spa, or any other water body.
products/11050 waterproof temp sensor
- A proto-board and male headers depending on how you want to set up the temp sensor
products.php?category=36& product_id=1130_0 two of these, one for pH and one for ORP
products.php?product_id=3556 industrial ORP probe
products.php?product_id=3551 industrial pH probe
?product=nanode-gateway-no- radio Nanode
- https://www.sparkfun.com/products/9717 programming cord for the Nanode (FTDI Cable)