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--- soil_sampler:start [2022/02/09 10:04] – jeff001
+++ soil_sampler:start [2022/04/20 10:09] (current) – add video of jeff001
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-====== Automated Soil sampling and solution mixer mechanism ======
+====== Soil sampling machine ======
 ===== Introduction =====
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 Soil samples are usually carried out by external services or farmers, while soil nitrate content analysis is usually carried out ex-situ in a laboratory. Mineralization of soil samples is a particular problem when they are not properly cooled during storage and shipping, which can lead to erroneous values in the analysis result. On the other hand, if the samples are frozen, thawing can substantially increase the nitrate content, producing incorrect information on the condition of the soil (Esala, 1994). Also, the need to send soil samples to a laboratory means that the farmer may have to wait for several days to receive the results.
+==== Ground water pollution map - NRW ====
+{{ :soil_sampler:nrw-gebietskulisse-nitrat-duengeverordnung.jpg?700 |}}
+The Landesamt für Natur, Umwelt und Verbraucherschutz Nordrhein-Westfalen – State Agency for Nature, Environment and Consumer Protection North Rhine-Westphalia – (LANUV NRW) determined the areas polluted with nitrate implementing the methodological specifications according to AVV GeA (§§ 4-10) in that region of Germany. During the study it has been found relevant the measuring points influenced by agriculture, which showed an excess or an increasing nitrate trend within an observation period 2009-2018. The Figure above shows a result map with the areas polluted by nitrate.
 ==== Project proposal ====
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 A completely automated system for nitrate content analysis in-situ can provide the farmer with quicker and more accurate results (based on the avoidance of the problems associated with the traditional ex-situ process). Since the mechanism covers until the mixture of the soil solution, it gives the possibility of using different nitrate tests, such as the widely known strips or ion-selective electrodes.
 This machine has its own platform on which it is mounted, then it can be carried by any vehicle through the field. A data analysis system would be part of the nitrate test system itself.
+===== Pre-tests =====
+A test has been made to check the behavior of a drill to get familiar with the process and consider it for machine structure requirements.
+Soil type: Clayey
+Place: GreenFabLab, KampLintfort, Germany.\\
+Date: 16/April/2021
+**Materials:**
+. Drill:\\
+- Brand and model: Bosch GSR 18V-21\\
+- Torque: 21/55Nm
+. Drill bit:\\
+- Diameter: 32mm\\
+- Length: 500mm
+{{:soil_sampler:drill1.jpg?450|}}
+**Process:**
+The first time, I got to drill 30cm depth.\\
+{{:soil_sampler:Test1_2.jpg?450|}}
+The second time, I got to drill 50cm, which is the total length of the bit.\\
+{{:soil_sampler:Test1_1.jpg?450|}}
+**Outlook:**
+During this test, it was remarkable that [with this amount of torque and these soil conditions] it is not possible to take a soil sample by drilling more than 30 centimeters deep in one go, separating the total depth on multiple phases would be a good an alternative to increasing torque in this case.
+<!--Measuring the torque in every moment, then when the torque demanded increases, finish that phase, clean the bit and continue with the next one.-->
 ===== Design =====
@@ Line 28: / Line 68: @@
 Sampling:
   * Up and Down system: Rack and pinion
-  * Sampling tool: Drill
+  * Sampling tool: Auger
   * Sampling tool rotation: DC motor
-==== Soil sampling mechanism====
 It is made of two parts: (i) a vertical motion sub-mechanism that is going to move the (ii) drilling mechanism which basically consists of a tool to drill down the soil.
@@ Line 38: / Line 76: @@
   * Sampling tool: Drill.
   * Sampling tool rotation: DC motor + gearbox
+=== Mechanism draft ===
 {{:soil_sampler:up-down_draft.jpeg?400|}}
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 I also add this draft describing the parts that will be part of the Up-Down sub-mechanism for the soil sampling mechanism.
-Animation of idea:\\
+=== Animation of 3D model ===
-{{:soil_sampler:idea2.gif?500|Animation}}
+{{:soil_sampler:drillanimation.gif?350|}}
-Prototype in development:\\
-{{:soil_sampler:prototype.jpg?600|}}
+<!--
 ==== Solution mixer mechanism ====
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   * I consider using the sampling tool also to mix the solution, which will be cleared through future tests and continuous research.
   * It could be partly merged with the Soil sampling part using the container for the sample as a container for mixing the solution using the same sampling tool.
+-->
 ===== Rovers =====
@@ Line 69: / Line 108: @@
 Weight: 65 Kg\\
 Payload: 65 Kg\\
-Speed: 3 m/s\\
+Max. speed: 3 m/s\\
 Environment: Indoor / Outdoor\\
 Autonomy: 10 h
@@ Line 80: / Line 119: @@
 {{:soil_sampler:FarmBot.jpg?500}}\\
+===== Tests =====
+==== Prototype in development ====
+Taking advantage of Digital fabrication technologies, 3D printed pieces are being used to evaluate aspects to improve regarding sizes, stability, and performance.
+{{:soil_sampler:prototype.jpg?700|}}\\
+==== Function demonstration ====
+| {{youtube>0fm3pWTSm7k?large}} |
+| //Vid.: Soil sampler prototype - Function demonstration. by Jefferson Sandoval// |
 ===== References =====
@@ Line 90: / Line 142: @@
 ===== Notes =====
-**Tests**
-[[soil_sampler:Tests|Tests]]
-**Bill of Materials**
-[[https://docs.google.com/spreadsheets/d/1ZAaKJ3Ea5_27BIRnqnSo56wTNFgmkp-aZzjndRmn_j4/edit?usp=sharing|BOM - Nitrate Robot]]
 **Rolf's notes**