Connecting 8 soil moisture sensors with Arduino Mega 2560

Using Arduino Sensors
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Hello. My group and I are kinda new to using the Arduino system. We are planning to connect and use a total of eight soil moisture sensors to Arduino Mega 2650 but we are having a hard time doing it. How do we connect it properly to the microcontroller? Do we need to buy a sensor shield or a multiplexer as well? Please do help us.

Our whole project is a smart irrigation system with 8 soil moisture sensors and 1 DH22 temperature and humidity sensor. We will be using this as our project in one of our courses. This will involve using a solenoid valve as well. Please give us some advice. Thank you so much.

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Arduino Mega 2560 has enough pins for 20 such sensors
how sensor is connected and used - look videos and read tutorials it is very simple.
if need more current as 20mA - use MOSFET,
if something contain coil it need flyback diode.

3

Hello fkdlakfm

Welcome to the world's best Arduino forum ever.

Please post the data sheet of soil moisture sensors used to see how we can help.

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We are gonna be using this type of soil moisture sensor but 8 of this. The tutorials on YouTube only show 1 of them being used so we are kind of confused about how can we connect 8 of them to the microcontroller.

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The tutorials in Youtube only use one sensor so we are having a hard time.

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do you ready to give up ?

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Not at all. :smile:

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A quick google with 'Arduino using multiple DH22 sensors'
gave me this first hit:

https://forum.arduino.cc/t/taking-readings-from-multiple-dht22-sensors-how-to-get-the-mac-address-of-each/211962

which has some helpful suggestions.

At a glance I'd say you'll be allocating each to its own pin. And using ready-made code from a library, such as Rob Tillart's.

1 Like
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This is a great start. Thank you!

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