Nose develop

Nose/.gitignore

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+.vscode
+source/trash
+pullreq-memo.txt

Nose/README.md

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+# ノーズ電装
+
+## 概要
+- This component has role of sensoring airspeed,temperature  and barometic pressure.
+- This component communicates with the main electrical compnent via the CAN protocol.
+## ハードウェア
+### BOM
+#### MCU
+- Seeduino Xiao RP2040
+
+#### Sensor
+- AE-BME280
+- MPXV5050DP
+#### ADC
+- MCP3421
+#### CAN
+- MCP25625
+#### Component
+##### Capacitor
+- [100uF16V 電解コン](https://akizukidenshi.com/catalog/g/gP-05002/)
+- [100uF10V 3216](https://akizukidenshi.com/catalog/g/gP-15633/)
+- [1uF25V 1608](https://akizukidenshi.com/catalog/g/gP-14526/)
+- [0.01uF50V 1608](https://akizukidenshi.com/catalog/g/gP-13387/)
+- [470pF50V 1608](https://akizukidenshi.com/catalog/g/gP-09268/)
+##### Resisiter
+- [100k 1/10W 1608](https://akizukidenshi.com/catalog/g/gR-11792/)
+- [49.9k 1/10W 1608](https://akizukidenshi.com/catalog/g/gR-11804/)
+- [4.7k 1/10W 1608](https://akizukidenshi.com/catalog/g/gR-14121/)
+
+### 回路
+<img src="images/circuit.png" width="100%">
+
+### PCB
+<img src="images/PCB1.png" width="300"><img src="images/PCB2.png" width="400">
+## ソフトウェア
+### 依存関係
+- Wire.h
+- CCP.h
+
+## 基礎知識
+
+### ベルヌーイの定理
+<img src="images/basic_knowledge/image.png" width="50%">
+
+$$p_1+\frac{1}{2} \rho v_1^2+\rho g z_1=p_2+\frac{1}{2}\rho v_2^2+\rho g z_2=\mathrm{const.}$$
+
+https://www.cradle.co.jp/glossary/ja_H/detail0038.html
+
+ここで空気密度$\rho$について考える．大気の標準組成は
+
+- $O_2=20.99$ %
+- $N_2=78.04$ %
+- $CO_2=0.03$ %
+- $Ar=0.94$ %
+
+そこから求まる大気の分子量は
+$$M=28.966[\mathrm{g/mol}]$$
+となる．気体の質量密度は，
+$$\rho=M\frac{n}{V}=\frac{MP}{RT}$$
+ここで，$R=8.314[\mathrm{Nmmol^{-1}K^{-1}}]$，とすると，
+$$\rho=\frac{28.966\times P}{8.314\times T}$$
+とわかる．
+
+http://sasaki.g1.xrea.com/powerpoint/vaporization-heat/03-Air-density.pdf
+
+
+
+
+
+
+
+

Nose/memo.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Nose関係メモ"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## 必要な知識\n",
+    "### ベルヌーイの定理\n",
+    "$$p_1+\\frac{1}{2} \\rho v_1^2=p_2+\\frac{1}{2}\\rho v_2^2$$\n",
+    "\n",
+    "つまり\n",
+    "$$v=\\sqrt{\\frac{2|p_1-p_2|}{\\rho}}$$\n",
+    "\n",
+    "https://www.cradle.co.jp/glossary/ja_H/detail0038.html"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "ここで空気密度$\\rho$について考える．大気の標準組成はO2:20.99%, N2:78.04%,CO2:0.03%, Ar:0.94%であり，そこから求まる大気の分子量は\n",
+    "$$M=28.966[\\mathrm{g/mol}]$$\n",
+    "となる．よって機体の質量密度は，\n",
+    "$$\\rho=M\\frac{n}{V}=\\frac{MP}{RT}$$\n",
+    "ここで，$R=8.314[\\mathrm{Nmmol^{-1}K^{-1}}]$，とすると，\n",
+    "$$\\rho=\\frac{28.966\\times P}{8.314\\times T}$$\n",
+    "とわかる．\n",
+    "\n",
+    "\n",
+    "http://sasaki.g1.xrea.com/powerpoint/vaporization-heat/03-Air-density.pdf"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 52,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "pdiff 17.400954329001497 kPa\n"
+     ]
+    }
+   ],
+   "source": [
+    "#差圧センサ選定用プログラム\n",
+    "import math\n",
+    "M=28.966\n",
+    "R=8.314\n",
+    "P=101325\n",
+    "celsius=20\n",
+    "T=celsius+273.15\n",
+    "#tagert airspeed\n",
+    "v=340*0.5\n",
+    "\n",
+    "ro=M*P/(R*T)/1000\n",
+    "# print(\"ro\",ro,\"kg/m^3\")\n",
+    "P_diff_Pa=(ro*v*v)/2\n",
+    "P_diff_kPa=P_diff_Pa/1000\n",
+    "\n",
+    "print(\"pdiff\",P_diff_kPa,\"kPa\")\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "これを測定できるいい感じの差圧センサはMPXV5050DPだと思う\n",
+    "\n",
+    "https://www.digikey.jp/ja/products/detail/nxp-usa-inc/MPXV5050DP/1168433?s=N4IgTCBcDaILIAUAaA1ArABkwEQSAugL5A　\n",
+    "\n",
+    "このセンサが測定できる最大大気速度は"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 57,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "v= 288.16908661510917\n"
+     ]
+    }
+   ],
+   "source": [
+    "#差動圧力\n",
+    "import math\n",
+    "M=28.966\n",
+    "R=8.314\n",
+    "P=101325\n",
+    "celsius=20\n",
+    "T=celsius+273.15\n",
+    "###############\n",
+    "P_diff_kPa=50\n",
+    "###############\n",
+    "P_diff=P_diff_kPa*1000\n",
+    "\n",
+    "ro=M*P/(R*T)/1000\n",
+    "v=math.sqrt(2*P_diff/ro)\n",
+    "\n",
+    "print(\"v=\",v)\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "よって今回のロケットマッハ0.33を超えていて大丈夫そう．"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## ADCの選定\n",
+    "\n",
+    "今回用いる5050DPはアナログ値を返すので，それなりのADCが欲しい．でこれ買った\n",
+    "\n",
+    "https://akizukidenshi.com/catalog/g/gI-16585/\n",
+    "\n",
+    "\n",
+    "- 電源電圧：2.5～5.5V\n",
+    "- 消費電流：155μA\n",
+    "- スタンバイ時電流：0.1μA\n",
+    "- 分解能(最低)：12bit\n",
+    "- 分解能(最高)：18bit\n",
+    "- データレート(最低)：3.75sps\n",
+    "- データレート(最高)：240sps\n",
+    "- INL：10ppm\n",
+    "- 内部基準電圧：2.048V\n",
+    "- インターフェース：I2C\n",
+    "- 変換方式：デルタシグマ\n",
+    "- 入力タイプ：差動入力\n",
+    "- 動作温度範囲：-40～125℃\n",
+    "- パッケージ：SOT-23-6"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "差圧センサは0~50kPaで0~5Vまで出力する．\n",
+    "MAXの5Vのとき，ADCにかかる電圧が2.000V位であってほしい\n",
+    "\n",
+    "$$V_{adc}=\\frac{R_1}{R_1+R_2}V_{out}$$\n",
+    "\n",
+    "のように分圧すればよく，\n",
+    "$$R_1:R_2=V_{adc}:(V_{out}-V_{adc})$$\n",
+    "であることがわかる．"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 58,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "R1:R2=1: 2.048 : 2.952\n"
+     ]
+    }
+   ],
+   "source": [
+    "Vadc=2.048\n",
+    "Vout=5\n",
+    "\n",
+    "print(\"R1:R2=1:\",Vadc,\":\",Vout-Vadc)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "とにかく高精度な抵抗を使って2:3を作り出したい．\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 68,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "1.6644429619746495\n"
+     ]
+    }
+   ],
+   "source": [
+    "R1=100\n",
+    "R2=49.9\n",
+    "R=R1+R2\n",
+    "Vout=5\n",
+    "print(R2/R*Vout)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "よってGNDよりが $49.9\\mathrm{k \\Omega}$，差圧センサのVout側が $100\\mathrm{k \\Omega}$\n",
+    "\n",
+    "https://akizukidenshi.com/catalog/g/gR-11804/\n",
+    "\n",
+    "https://akizukidenshi.com/catalog/g/gR-11792/"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.1"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}