Wifi LED CPM Display for displaying station count

/*
LED display with bar graph for displaying Radmon.org CPM By Simomax

-------------------------------------------------------------
Display:

MAX7219 Power Display Round Type - Tester and Soak Tester
Version 1 - 6th May 2021
Board: Arduino UNO

Pin connections
Name Arduino MAX7219 7 Segment display
-----------------------------------------------
+5V VCC
GND GND
DIN D11/MOSI DIN Wemos D7
CS D10/SS CS Wemos D8
CLK D13/SCK CLK Wemos D5

David Mottram www.mottramlabs.com
MAX7219 Library & Documentation: https://github.com/Mottramlabs/MAX7219-7-Segment-Driver
-------------------------------------------------------------

Ver 1.3 22/12/2021

Change Log:
1.0 - Initial release
1.1 - Added animation
1.2 - Tidied code. Added user variables to make it easier for newbie programmers/builders (and me!)
1.3 - Added feature to display in uSv/hr

*/

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#include <SPI.h> // SPI library needed for the MAX7219 library
#include <MAX7219_Digits.h>
#define MAX7219_CS D8 // CS pin used on Arduino

MAX7219_Digit My_Display(MAX7219_CS); // Make an instance of MAX7219_Digit called My_Display and set CS pin

int Bar_1[25] {0, 128, 192, 224, 240, 248, 252, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255};
int Bar_2[25] {0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 192, 224, 240, 248, 252, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255};
int Bar_3[25] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 192, 224, 240, 248, 252, 254, 255};

String payload;
float cpm;
float dispcpm;
float oldcpm;

//User variables ------------------------------------------

bool useuSv = false; // Display microsieverts per hour (uSv/hr) instead of CPM. Requires the conversion factor to be that of the GM tube in the counter.
float conversionFactor = 0.0057; // onversion factor for uSV. 0.00833 for LND712 / 0.0057 for SBM-20 / 0.00812 for J305B.
int brightness = 2; // 0-15 brightness.
int interval = 60000; // Interval to check the page and get the latest CPM. For Radmon.org 60000 (60 seconds) is recommended as the minimum value. For testing with the random CPM generator, 5000 is suggested minimum: (http://wasabi.schmoozie.co.uk/radmon/random_cpm.php).
#define usedecimal 1 // 0 for no decimal point and 1, 2 or 3 for a decimal point and the number of 0's after. This has no effect when 'useuSv' is true.
//String url = "http://wasabi.schmoozie.co.uk/radmon/random_cpm.php"; // Can be used for testing. Set the interval to 5000 when testing.
String url = "http://radmon.org/radmon.php?function=lastreading&user=radspod_one";
//String url = "http://radmon.org/radmon.php?function=lastreading&user=radspod_north";

//End user variables --------------------------------------


String getValue(String data, char separator, int index) // function used to get the first part of the string received
{
int found = 0;
int strIndex = {0, -1};
int maxIndex = data.length() - 1;

for (int i = 0; i <= maxIndex && found <= index; i++) {
if (data.charAt(i) == separator || i == maxIndex) {
found++;
strIndex[0] = strIndex[1] + 1;
strIndex[1] = (i == maxIndex) ? i + 1 : i;
}
}

return found > index ? data.substring(strIndex[0], strIndex[1]) : "";
}

ESP8266WiFiMulti WiFiMulti;

void setup() {

Serial.begin(115200); Serial.println(""); Serial.println("Clackin!");
WiFi.mode(WIFI_STA);
WiFiMulti.addAP("Your-SSID", "Your-Password");
}

void loop() {

// wait for WiFi connection
if ((WiFiMulti.run() == WL_CONNECTED)) {

WiFiClient client;

HTTPClient http;
Serial.print("[HTTP] begin...\n");
// configure traged server and url
//http.begin(url, "7a 9c f4 db 40 d3 62 5a 6e 21 bc 5c cc 66 c8 3e a1 45 59 38"); //HTTPS - can't get this to work
//http.begin(url); //HTTP
if (http.begin(client, url)) { // HTTP

Serial.print("[HTTP] GET...\n");
// start connection and send HTTP header
int httpCode = http.GET();

// httpCode will be negative on error
if (httpCode > 0) {
// HTTP header has been send and Server response header has been handled
Serial.printf("[HTTP] GET... code: %d\n", httpCode);

// file found at server
if (httpCode == HTTP_CODE_OK) {
payload = http.getString();
Serial.println(payload);
}

String firstPart = getValue(payload, ' ', 0);
Serial.println(firstPart);
cpm = firstPart.toFloat();
} else {
Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
}
http.end();
}

int steps;

if (oldcpm == cpm) { //------------------------------------------------ do nothing
Serial.println("Doing nothing....");
}

else if (oldcpm < cpm) { //------------------------------------------------ count up
Serial.println("Count up!");
My_Display.Begin();
My_Display.Brightness(brightness); // Set brightness 0-15
while (oldcpm < cpm) {
if (useuSv) {
float tempuSv = oldcpm * conversionFactor;
My_Display.Display_Value(1, tempuSv, 3, 0x00);
}
else {
My_Display.Display_Value(1, oldcpm, usedecimal, 0x00);
}
int xcpm;
if (oldcpm > 99) {
xcpm = 99;
}
else {
xcpm = oldcpm;
}
int xx = map(xcpm, 0, 100, 0, 25);
My_Display.MAX7219_Write(5, Bar_1[xx]);
My_Display.MAX7219_Write(6, Bar_2[xx]);
My_Display.MAX7219_Write(7, Bar_3[xx]);
oldcpm += 0.1;
if ((cpm - oldcpm) <= 1) { // these delays slow the display down when reaching its destined number. Gives it a 'dampened' feel
delay(50);
}
else if ((cpm - oldcpm) <= 2) {
delay(40);
}
else if ((cpm - oldcpm) <= 3) {
delay(30);
}
else if ((cpm - oldcpm) <= 5) {
delay(20);
}
else if ((cpm - oldcpm) <= 10) {
delay(10);
}
else {
delay(5);
}
}
}

else if (oldcpm > cpm) {//------------------------------------------------ count down
Serial.println("Count Down!");
My_Display.Begin();
My_Display.Brightness(brightness); // Set brightness 0-15
while (oldcpm > cpm) {
if (useuSv) {
float tempuSv = oldcpm * conversionFactor;
My_Display.Display_Value(1, tempuSv, 3, 0x00);
}
else {
My_Display.Display_Value(1, oldcpm, usedecimal, 0x00);
}
int xcpm;
if (cpm > 99) {
xcpm = 99;
}
else {
xcpm = oldcpm;
}
int xx = map(xcpm, 0, 100, 0, 25);
My_Display.MAX7219_Write(5, Bar_1[xx]);
My_Display.MAX7219_Write(6, Bar_2[xx]);
My_Display.MAX7219_Write(7, Bar_3[xx]);
oldcpm -= 0.1;
if ((oldcpm - cpm) <= 1) { // these delays slow the display down when reaching its destined number. Gives it a 'dampened' feel
delay(50);
}
else if ((oldcpm - cpm) <= 2) {
delay(40);
}
else if ((oldcpm - cpm) <= 3) {
delay(30);
}
else if ((oldcpm - cpm) <= 5) {
delay(20);
}
else if ((oldcpm - cpm) <= 10) {
delay(10);
}
else {
delay(5);
}
}
}

My_Display.Begin(); //---------------------------------------------------- just set the damn thing as sometimes it will be 0.1 out and I can't be bothered chasing it in code.
My_Display.Brightness(brightness); // Set brightness 0-15
if (useuSv) {
float tempuSv = cpm * conversionFactor;
My_Display.Display_Value(1, tempuSv, 3, 0x00);
}
else {
My_Display.Display_Value(1, cpm, usedecimal, 0x00);
}
int xcpm;
if (cpm > 99) {
xcpm = 99;
}
else {
xcpm = cpm;
}
int xx = map(xcpm, 0, 100, 0, 25);
My_Display.MAX7219_Write(5, Bar_1[xx]);
My_Display.MAX7219_Write(6, Bar_2[xx]);
My_Display.MAX7219_Write(7, Bar_3[xx]);

if ((WiFiMulti.run() == WL_CONNECTED)) {
oldcpm = cpm;
delay(interval);
}
}
}

<?php
echo(rand(10,100) . " CPM on " . date('Y-m-j h:i:s') . "UTC at Random_CPM, Generator, UK");
?>