handheld Soil Monitor pendant

[last updated: 2016-09-08]

-----

pendant case

detailed wiring schematic

proto shield wired

pendant complete

The pendant contains:

• a smoke/translucent case (Adafruit PID: 821)
• Arduino Uno
• 16-char x 2-line LCD readout
• These are pretty generic, but mine is an Adafruit PID: 181
• Adafruit i2c/SPI backpack (PID: 292) to drive the LCD
• backpack-to-LCD assembly
• proto shield on top of Uno
• 16-channel analog/digital MUX
• The mux is needed because there are 5 analog signals coming off the probe, but the Uno only has 6 analog inputs, and two of them are used for the i2c talking to the LCD
• There are several clones of this available, using the CD74HC4067 chip. Search online.
• female 6-pin plug pigtail to probe

         

-------------------------------------

pendant case with Uno