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Work on nitrate sensor
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‎Nitrate Sensor/nitrate_sensor.scad

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# Nitrate sensor
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// Nitrate sensor
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//
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// This is housing for an optical nitrate sensor that's meant to hang out underwater.
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//
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// There are two main parts: The emitter module and the photodiode module.
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// Both sit behind quartz discs that allow UV light to pass through.
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quartz_radius = 5 + 0.1; // Radius of quartz disc, plus a bit extra for tolerance
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quartz_thickness = 0.8; // Thickness of quartz disc
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wall_thickness = 1.2;
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gap_distance = 10; // Gap between emitter and photodiode
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extra_height = 5;
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base_height = 3; // Height of base
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compartment_height = 20; // Height of compartment (enough to fit electronics)
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x = 100/2;
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y = 63/2;
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r = quartz_radius;
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t = wall_thickness;
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g = gap_distance;
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$fn = 50;
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translate([0, 0, base_height]) difference() {
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base();
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carveout();
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emitter_negatives();
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}
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union() {
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h = compartment_height;
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translate([0, x + 20, h]) {
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difference() {
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compartment(1, h);
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translate([0, 0, 1]) compartment(0, h);
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screw_holes(h, 2);
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}
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translate([0, 0, 0]) difference() {
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screw_holes(h-1, 3);
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screw_holes(h-1, 1);
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}
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}
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}
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module base() {
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r = 25;
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h = base_height;
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p = 15;
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difference() {
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hull() {
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compartment();
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emitters();
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}
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// compartment(-1);
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translate([0, 0, -1]) difference() {
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scale([0.85, 0.8, 1]) hull() {
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compartment();
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emitters(-5);
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}
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hull() {
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scale([1.3, 1, 1]) carveout();
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translate([0, 0, -100]) scale([1.3, 100, 1]) carveout();
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}
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}
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translate([0, 0, -1]) screw_holes(h-1, 0.8);
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}
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}
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module compartment(o=0, h=base_height) {
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r = 2;
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translate([0, 0, -h]) linear_extrude(h) {
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hull() offset(o) {
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translate([x, y]) circle(r);
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translate([-x, y]) circle(r);
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translate([x, -y]) circle(r);
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translate([-x, -y]) circle(r);
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}
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}
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}
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module screw_holes(h, r=2) {
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translate([0, 0, -h]) linear_extrude(h) {
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union() {
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translate([x, y]) circle(r);
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translate([-x, y]) circle(r);
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translate([x, -y]) circle(r);
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translate([-x, -y]) circle(r);
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}
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}
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}
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module carveout() {
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h = gap_distance;
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r = r + 4;
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translate([-h/2, 0, 10]) rotate([0, 90, 0]) scale([1,2,1]) cylinder(h, r=r);
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}
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module emitters(extra_distance=0) {
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translate([0, 0, extra_height]) {
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emitter_housing(extra_distance);
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mirror([1, 0, 0]) emitter_housing(extra_distance);
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}
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}
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module emitter_negatives() {
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translate([0, 0, extra_height]) {
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emitter_housing_cutouts();
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mirror([1, 0, 0]) emitter_housing_cutouts();
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}
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}
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module emitter_housing(extra_distance) {
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h1 = 10; // body height
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h2 = 1.5; // cap height
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h3 = quartz_thickness;
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translate([-h1-h2-g+extra_distance/2, 0, r+t]) rotate([0, 90]) {
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hull() {
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cylinder(h1, r=r+t);
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translate([0, 0, h1]) cylinder(h2, r=r+t - 0.5);
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}
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}
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}
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module emitter_housing_cutouts(h1=10, h2=1.5, h3=quartz_thickness) {
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h1 = 10; // body height
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h2 = 1.5; // cap height
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h3 = quartz_thickness;
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translate([-h1-h2-g/2, 0, r+t]) rotate([0, 90]) {
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cylinder(h1, r=r);
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translate([0, 0, h1]) cylinder(h2, r=r-1);
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translate([0, 0, h1+h2-h3]) cylinder(h2, r=r);
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}
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}

‎Nitrate Sensor/nitrate_sensor/nitrate_sensor.ino

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/*
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Using the AMS AS7331 Spectral UV Sensor in Command/One Shot (CMD) Mode.
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This example shows how operate the AS7331 in the default CMD mode. The start
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command is sent, then delays until the conversion time has passed before
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reading out the UV values.
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By: Alex Brudner
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SparkFun Electronics
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Date: 2023/11/17
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SparkFun code, firmware, and software is released under the MIT License.
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Please see LICENSE.md for further details.
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Hardware Connections:
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IoT RedBoard --> AS7331
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QWIIC --> QWIIC
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Serial.print it out at 115200 baud to serial monitor.
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Feel like supporting our work? Buy a board from SparkFun!
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https://www.sparkfun.com/products/23517 - Qwiic 1x1
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https://www.sparkfun.com/products/23518 - Qwiic Mini
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*/
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#include <Arduino.h>
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#include <Wire.h>
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#include <SparkFun_AS7331.h>
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#include "heltec.h"
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SfeAS7331ArdI2C myUVSensor;
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void setup() {
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Heltec.begin(true /*DisplayEnable Enable*/, false /*LoRa Disable*/, true /*Serial Enable*/);
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Serial.begin(115200);
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delay(2000);
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while (!Serial) { delay(100); };
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Serial.println("AS7331 UV A/B/C Command (One-shot) mode Example.");
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Heltec.display->init();
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Heltec.display->setFont(ArialMT_Plain_16);
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Heltec.display->flipScreenVertically();
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Heltec.display->clear();
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Wire1.begin(3, 4); // SDA on GPIO3, SCL on GPIO4
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// Initialize sensor and run default setup.
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if (myUVSensor.begin(kDefaultAS7331Addr, Wire1) == false) {
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Serial.println("Sensor failed to begin. Please check your wiring!");
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Serial.println("Halting...");
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while (1);
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}
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setupGain();
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Serial.println("Sensor began.");
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// Set measurement mode and change device operating mode to measure.
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if (myUVSensor.prepareMeasurement(MEAS_MODE_CMD) == false) {
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Serial.println("Sensor did not get set properly.");
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Serial.println("Halting...");
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while (1)
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;
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}
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Serial.println("Set mode to command.");
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}
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void setupGain() {
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as7331_gain_t desiredGain = GAIN_16;
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sfeTkError_t result = myUVSensor.setGain(desiredGain);
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if (result != kSTkErrOk) {
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Serial.println("Failed to set gain!");
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// Handle the error, e.g., retry or use a default gain setting
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} else {
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Serial.println("Gain set successfully.");
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}
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}
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void loop() {
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// Send a start measurement command.
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if (kSTkErrOk != myUVSensor.setStartState(true))
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Serial.println("Error starting reading!");
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// Wait for a bit longer than the conversion time.
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delay(2 + myUVSensor.getConversionTimeMillis());
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// Read UV values.
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if (kSTkErrOk != myUVSensor.readAllUV())
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Serial.println("Error reading UV.");
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// Serial.print("UVA:");
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// Serial.print(myUVSensor.getUVA());
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// Serial.print(" UVB:");
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// Serial.print(myUVSensor.getUVB());
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// Serial.print(" UVC:");
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// Serial.println(myUVSensor.getUVC());
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String output = String(myUVSensor.getUVA()) + ", " + String(myUVSensor.getUVB()) + ", " + String(myUVSensor.getUVC());
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Serial.println(output);
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display(output);
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delay(200);
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}
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void display(String message) {
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Heltec.display->clear();
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Heltec.display->drawString(3, 15, message);
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Heltec.display->display();
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}

‎Nitrate Sensor/nitrate_sensor_full.stl

951 KB
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‎Nitrate Sensor/nitrate_sensor_top.stl

276 KB
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