Plant Water Monitor - PWM

🔘The "Plant Water Monitor" ( PWM ) project has been completed. It's function is to measure the 💧moisture in the soil where a 🪴plant is growing. The PWM consists of a capacitive soil moisture sensor, µ-controller, rechargeable battery, 🔋battery charger, waterproof enclosure, 🛜Wifi and webserver serving a webpage. In use, the protruding moisture sensor is pushed into the soil near the 🪴plant's roots.

Plant Water Monitor

The ﹌moisture measurement is sent by the webserver using 🛜Wifi and 'Websockets' to the PWM webpage opened in a browser, running on a client computer💻 or phone🖁. Websockets and the preliminary webpage designs were the subjects of the last post, on 📅20 April 2025. 

Two PWM firmware versions have been made; each having a different 🛜Wifi configuration. Depending on the location of the 🪴plant of interest, either the version of the PWM configured as a 🛜Wifi 'Station (STA)' on an existing network or the version configured as a stand-alone 'Soft Access Point (SAP)' would be chosen. The former requires an existing 🛜Wifi network to be in range of both the PWM and phone etc; the latter does not have that restriction but does require the client device to be connected to SSID "SpacerLabs-Wifi-Sensors".

A different webpage has been designed for each version of the PWM, using HTML, CSS & JavaScript. The webpage ( IP:192.168.1.63 ) for the version supporting 'STA' is almost identical to V4 shown in the previous post, with the addition of the 🔋battery charge status.

Notice the 'favicon' in the browser page tab (click to enlarge)

The webpage for the PWM version supporting 'SAP' is shown in the image below, and is being displayed on a phone's browser, after connecting to 🛜Wifi network 'SpacerLabs-Wifi-Sensors' & then navigating to IP:192.168.4.1.

Page: plant-water-monitor-v2.html

Features supported include Wifi signal monitoring, 🕓time-stamp, battery🔋 charge state, soil moisture, serial number, chip model & revision, pop-ups for 💦moisture level categories and ⛿flagging recommended action.

The latest issue of the 'User Guide' can be downloaded 🔗 here 🔘