Did a lot of testing and calibration work on the pH meter – read full post here
Design Notes and Current Challenges
Decided to focus on Wi-Fi connectivity and drop Bluetooth for now. I think Wi-Fi will be easier solution to setup – serve up local webpage with results and also do a basic iPhone app. Since proof-of-concept is going to be plugged in to AC power don’t really need benefits of low power Bluetooth.
Looked at more powerful Arduino boards and settled on the Arduino Mega as upgrade if required since it has more GPIO pins and larger memory size (for touch screen with graphics)
The MEGA 2560 is designed for more complex projects. With 54 digital I/O pins, 16 analog inputs and a larger space for your sketch it is the recommended board for 3D printers and robotics projects. This gives your projects plenty of room and opportunities.