Plantbug

thingiverse

Plantbug - IoT humidity, temperature, soil moisture sensor for Lolin (Wemos) D1 Mini. Content: PCB: SVG, PNG. Note: Case designed for 0,8 mm PCB!!! Thicker will require redesign! CAD: FreeCad + stl/amf exports. Partslist This file ---------------------------------------------------------------- Info: Uses D2 for DHT22-sensor. Uses analog input for soil moisture; A sensor available from different sources named "Capacitive Soil Moisture Sensor 1.2" - Edit: Put epoxi on the edges, otherwise water will seep in! Calibration: Soil moisture will show ~850 in air and ~420 in water. Individual sensors differs somewhat. I use this formula: Moisture = 100 * (AIRval-value) / (AIRval - WATERval) to get moisture level from 0 to 100. Example for EspEasy: 100*(816-%value%)/(816-422) I used toner-transfer method for PCB. Refer to datasheets and PCB layout image for sensor connections and component placements. Solder male headers on Wemos, female on PCB. Vice verse should work too if preferred, of course. ---------------------------------------------------------------- Printing: Requires printer tuned for accuracy due to tight tolerances (snapfit). Printed with 0.8 wall, 20% infill. Lid upside down with supports. ---------------------------------------------------------------- Disclaimer: Do not water on electronics. :) Ventilation holes needed for accurate temp reading & cooling. Produced and used at own responsability. Seems to work for me though. ---------------------------------------------------------------- Edits: 210314: Correction regarding formula. 210619: Epoxi edges on moist-sensor.