I want to construct one, but have doubts after looking at schematics. The light detection part (LDR sensor) used for reading & detecting values from RGB LED seems to be enough to attain measured nutrient level from the soil sample.
However, after watching this video I can't decide which one to try and construct.
I need to have this sensor implemented as crucial component of my system. Please give me some advice or guidelines, I'm currently in a dead end
If it's feasible to identify the nutrients from the colour of a solution made with some stuff that comes with a kit, strikes me that an Arduino and IoT is a bit of overkill.
Seems like it's hardly more than a homeowner pool test kit.
Even with 3 things to measure, and I get that it's the combination of the 3 that informs the decision to add or to the soil, it should be feasible to compare the colours to the charts, and add or according to the instructions on the back.
lindsayBoxer:
If it's feasible to identify the nutrients from the colour of a solution made with some stuff that comes with a kit, strikes me that an Arduino and IoT is a bit of overkill.
Seems like it's hardly more than a homeowner pool test kit.
Even with 3 things to measure, and I get that it's the combination of the 3 that informs the decision to add or to the soil, it should be feasible to compare the colours to the charts, and add or according to the instructions on the back.
I've sent bradleybradms this already, since you mentioned overkill doing IoT analysis take a look at this
The only way to know if the kit works at all is to compare kit results with those obtained by sending a sample of the same soil to a reliable testing agency.
Keep in mind that the kit tests for only certain ions, like NO3-, whereas agencies can test for total oxidized nitrogen.
The eBay ad sure looks like a scam to me. This sentence is a dead giveaway: "NPK is an important element in the soil".
There is absolutely no way that three conductive rods can be used to individually quantify nitrogen, phosphorous and potassium content in soil. US$250 completely wasted.