LoRa pH temperature sensor

This is a nice LoRa sensor for measuring the pH and the temperature of your swimming pool, drainage-basin or whatever you like.

Electronic design	LoRa T-Beam

cayenne.mydevices temperature graph	cayenne.mydevices pH graph

Parts

• T-Beam v1.1
• Kradex case: Z74JPH TM ABS
• Kradex case plate: https://www.thingiverse.com/thing:5322236

Buttons

• The User button is fitted to the case, with this button you can enable/disable the LCD backlight.
• With the MENU (Calibrate mode) button you can step through the menu: you can enable/disable GPS, and calibrate the pH-sensor with pH-buffers 4,7 and 10.
• The SET (Calibrate) button must be used to activate a specific menu option.

Used software

• Visual Studio Code with PlatformIO
• LMIC node package: https://github.com/lnlp/LMIC-node

LoRa setup

• you need to rename the lorawan-keys_example.h file into lorawan-keys.h and change the content, see LMIC documentation.

pH meter

• The pH meter must be calibrated on a regular basis, there is no temperature compensation build in, but maybe someone can add that to the software, would be nice.

Assembly-tips

• Desolder the T-Beam lIPO-holder, we don't use it: the pH-sensor drains the 18650 battery too fast.