pool o meter - gdamjan/gdamjan.github.io GitHub Wiki

• http://www.raspberrypi.org/
• usb wifi dongle
• SPI LCD
• pH sensor + attiny25 for ADC
• trimmers
• button

Have an autonomous device that measures, stores and displays the pH value of a pool.

A raspberry-pi has enough resources to do all the processing itself. I'm adding an LCD display that will show the current pH, and can be used to trim the pH sensor. The button is when you want to trim it.

An attiny25 (ideally with the internal oscillator) will be used to read the analogue data from the sensor and send it to the main cpu over SPI, I2C or serial.

I'll use the A model since it'll work in a remote place, so wired ethernet would be useless. An USB wifi dongle will be used for communication instead.

• Linux
• wifi/usb support
• programming language with web server (python, lua)