Intro
I built a small greenhouse for the balcony. I decided to arm it with an Arduino sensor just to make sure if it's of some use. I found some interesting data and will describe the whole process in the following posts. The first post will be about building a sensor. Let's start with a simple parts list:
- Arduino Uno
- USB cable
- Power bank
- 10K Ohm NTC 5mm Thermistor
- DHT11 temperature and humidity sensor.
- GL5528 Photo Resistor (we'll bind it with 1K Ohm Resistor)
- nRF24L01+
- 10K Ohm resistor
- 1K Ohm resistor
- 17 Wires
Installing the libraries
To send the data over the nRF we'll use a library. To install the library download the file https://github.com/maniacbug/RF24/archive/master.zip. Create a new sketch or open the example from gitHub and click on Sketch - Import Library - Add Library. Select the zip archive and the Arduino IDE should install the library. Repeat the same steps for the temperature and humidity sensor https://github.com/adafruit/DHT-sensor-library/archive/master.zip
Wiring
The example has two temperature sensors. One is for the outside and will be connected with longer wires. You'll have to compare the readings from both sensors in the same environment and see the offset in the readings. The humidity sensor can also read the temperature but it is not very precise and is relatively slow. We'll use this value simply as a check value.
The code
The example is available on GitHub under https://github.com/msval/arduino_greenhouse/tree/master/arduino_temp_sensor
The result
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