Indoor plants watering system

Automatic Plant Watering SystemMonitoring is the first step to understanding and fixing almost all issues. As a hobby I have been growing my own chillies with varied success; my issue has been remembering to water the poor things. So after countless disappointing harvests, I decided to monitor my chilli plants and automate their care as much as I could by using cheap, off the shelf components. This post will detail my experiments with electronics, APIs and the Server Density monitoring tool.

Nano Close UpChilli Irrigation System

My first step was to set up the technology behind the components, for this I needed a and an . The Raspberry Pi to connect the Arduino to my network, and the Arduino to add analog inputs to the setup (which the Pi is unable to do). Although there are to give the Pi an analog reading, none of them seemed 100% reliable and I had an Arduino Nano spare.

Monitoring a Chilli PlantServer Density don’t currently have a packaged agent for the Raspberry Pi but as it’s Python, you can easily clone the source from or download it from Server Density.

Once I did that, it was time to have a look at the basic sensors I was able to attach to the Arduino board, that would help to prolong the life and improve the yield of my plants:

  • Temperature – averaged from the humidity and pressure sensors
  • Humidity – detect water vapour level in the air
  • Moisture – two prong sensor embedded into the soil and into the water reservoir
  • Light - light dependent resistor
  • Pressure – barometric air pressure (not directly related to plant health but fun to graph)

When I started I had little experience with electronics and Arduino boards, luckily there are a lot of very simple guides available for using each of the sensors – .Arduino board sensors. Below is a close up of the board:

The Arduino connects to the Raspberry Pi via USB and sends the data back over serial in a JSON string. The cable powers the board and provides a serial link to allow the data to come back from the sensors. A plugin then runs in the Server Density agent which reads the serial device until a complete set of readings is received (or 20 seconds is exceeded) – then the PI’s WiFi dongle allows it report the data back to Server Density for graphing.

monitoring chilli plants server density monitoring

Hot water recirculators ...choose carefully

2006-08-30 10:01:55 by 1ADAM12_1ADAM12

THIS PERTAINS TO THE SYSTEMS WHICH HAVE A PUMP MOUNTED ON TOP OF THE WATER HEATER AND A BYPASS VALVE UNDER THE SINKS.
A closer look at hot water recirculator thermostatic valve operations, discovers why homeowners were less then pleased with their homes hot water performance and abnormally high water heating bills even to the point of unplugging the recirculators pump. Thermostatic valves connect the homes hot and cold water lines together and the internal valve opens and closes in reaction to the hot / cold water contacting them. These “normally open” valves constantly remain open unless water 95F degree or hotter constantly contacts them to keep the valve closed


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As Troy has previously done at Sertão and Andorinhas in Brazil, and Casposo in Argentina, we will manage the project in-house and use second hand plant and equipment where it makes sense. This formula has ... plant site.

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