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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
+
+
+### PCB
+
+## 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
+
+
+$$p_1+\frac{1}{2} \rho v_1^2+\rho g z_1=p_2+\frac{1}{2}\rho v_2^2+\rho g z_2=\mathrm{const.}$$
+
+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
+
+
+
+
+
+
+
+
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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
+}
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