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Author SHA1 Message Date
nilo 0abcf7d246 wip wifi support 2020-11-09 00:50:07 +01:00
7 changed files with 191 additions and 10 deletions

3
NOTES.md Normal file
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@ -0,0 +1,3 @@
http://tomeko.net/online_tools/cpp_text_escape.php?lang=en
https://www.willpeavy.com/tools/minifier/

2
config.h.example Normal file
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@ -0,0 +1,2 @@
#define SSID "co2ampel";
#define PASSWORD "<change this!>";

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@ -2,6 +2,10 @@
#include "MHZ19.h"
#include "SSD1306Wire.h"
#include <Adafruit_NeoPixel.h>
#include <WiFi.h>
#include "config.h"
#include "html.h"
#include "javascript.h"
// Maximum CO² levels for green and yellow, everything above is considered red.
#define GREEN_CO2 800
@ -21,14 +25,26 @@
// Pin for LED
#define LED_PIN 4
const char* ssid = SSID
const char* password = PASSWORD
const char* html = HTML;
const char* chartjs = CHARTJS;
WiFiServer server(80);
MHZ19 myMHZ19;
HardwareSerial mySerial(1);
SSD1306Wire display(0x3c, SDA_PIN, SCL_PIN);
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(1, LED_PIN, NEO_RGB + NEO_KHZ400);
String header;
String response_body;
WiFiClient client;
unsigned long getDataTimer = 0;
int lastvals[120];
int lastvals[12000];
int dheight;
int CO2;
IPAddress IP;
void setup() {
Serial.begin(9600);
@ -39,14 +55,19 @@ void setup() {
delay(1000);
display.clear();
dheight = display.getHeight();
myMHZ19.autoCalibration();
myMHZ19.autoCalibration(false);
// Fill array of last measurements with -1
for (int x = 0; x <= 119; x = x + 1) {
for (int x = 0; x <= 11999; x = x + 1) {
lastvals[x] = -1;
}
pixels.begin();
pixels.setPixelColor(0, 30,0,0);
pixels.show();
WiFi.softAP(ssid, password);
IP = WiFi.softAPIP();
Serial.print("AP IP address: ");
Serial.println(IP);
server.begin();
}
int calc_vpos_for_co2(int co2val, int display_height) {
@ -67,24 +88,56 @@ void set_led_color(int co2) {
pixels.show();
}
void json_header() {
client.println("HTTP/1.1 200 OK");
client.println("Content-type:application/json");
client.println("Connection: close");
client.println();
}
void html_header() {
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
}
void js_header() {
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/javascript");
client.println("Connection: close");
client.println();
}
void not_found() {
client.println("HTTP/1.1 404 NOT FOUND");
client.println("Content-type:text/plain");
client.println("Connection: close");
client.println();
}
void loop() {
if (millis() - getDataTimer >= INTERVAL) {
// Get new CO² value.
int CO2 = myMHZ19.getCO2();
CO2 = myMHZ19.getCO2();
// Shift entries in array back one position.
for (int x = 1; x <= 119; x = x + 1) {
for (int x = 1; x <= 11999; x = x + 1) {
lastvals[x - 1] = lastvals[x];
}
// Add new measurement at the end.
lastvals[119] = CO2;
// Clear display and redraw whole graph.
lastvals[11999] = CO2;
// Clear display and redraw graph of last 120 values.
display.clear();
for (int h = 1; h < 120; h = h + 1) {
for (int hs = 1; hs < 120; hs = hs + 1) {
int h = 1200-120+hs;
int curval = lastvals[h];
if (curval > 0) {
int vpos = calc_vpos_for_co2(lastvals[h], dheight);
int vpos_last = calc_vpos_for_co2(lastvals[h - 1], dheight);
display.drawLine(h - 1, vpos_last, h, vpos);
display.drawLine(h, vpos - 1, h, vpos + 1);
}
}
// Set LED color and print value on display
@ -96,6 +149,77 @@ void loop() {
// Debug output
Serial.print("CO2 (ppm): ");
Serial.println(CO2);
Serial.println(IP);
getDataTimer = millis();
}
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
Serial.println("New Client."); // print a message out in the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
header += c;
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request.
// handle requests here
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
if (header.indexOf("GET /data.json") >= 0) {
json_header();
client.print("{ data: [");
for (int x = 0; x <= 11999; x = x + 1) {
if (x % 60 == 0) {
client.print("{ minutes:");
client.print(x/60);
client.print(", ppm:");
client.print(lastvals[x]);
client.println("}, ");
}
}
client.print("] }");
} else if (header.indexOf("GET /chart.js") >= 0) {
js_header();
client.print(chartjs);
} else if (header.indexOf("GET /favicon.ico") >= 0) {
not_found();
client.println("nope");
} else if (header.indexOf("GET /") >= 0) {
html_header();
client.println(html);
// client.println(CO2);
// client.println(co2_html_2);
}
// The HTTP response ends with another blank line
client.println();
// Break out of the while loop
break;
} else { // if you got a newline, then clear currentLine
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
}
}
header = "";
response_body = "";
// Close the connection
client.stop();
Serial.println("Client disconnected.");
Serial.println("");
}
}

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src/html.h Normal file
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#define HTML "<html> <head> <script src=\"/chart.js\"></script> <title>CO²-Ampel</title></head> <body> <canvas id=\"myChart\" width=\"100%\" height=\"100%\"></canvas> <script> var ctx = document.getElementById('myChart');var myChart = new Chart(ctx, { type: 'bar', data: { labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'], datasets: [{ label: '# of Votes', data: [12, 19, 3, 5, 2, 3], backgroundColor: [ 'rgba(255, 99, 132, 0.2)', 'rgba(54, 162, 235, 0.2)', 'rgba(255, 206, 86, 0.2)', 'rgba(75, 192, 192, 0.2)', 'rgba(153, 102, 255, 0.2)', 'rgba(255, 159, 64, 0.2)' ], borderColor: [ 'rgba(255, 99, 132, 1)', 'rgba(54, 162, 235, 1)', 'rgba(255, 206, 86, 1)', 'rgba(75, 192, 192, 1)', 'rgba(153, 102, 255, 1)', 'rgba(255, 159, 64, 1)' ], borderWidth: 1 }] }, options: { scales: { yAxes: [{ ticks: { beginAtZero: true } }] } }}); </script> </body> </html>";

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src/javascript.h Normal file

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static/Chart.bundle.min.js vendored Executable file

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static/index.html Normal file
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<html>
<head>
<script src="/chart.js"></script>
<title>CO²-Ampel</title></head>
<body>
<canvas id="myChart" width="100%" height="100%"></canvas>
<script>
var ctx = document.getElementById('myChart');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
</script>
</body>
</html>