文章目录
- 前言
- 代码1
- 结果1
- 代码2
- 结果2
前言
打算编写一个字幕滚动显示。
可以使用链表、数组、字符串拼接
预计使用循环链表，然后显示其中的3个连续数据，显示在显示屏的第2、3、4行。——delay
使用string数组最为简便。
代码1
/*func3.2 display scrolling list */#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEScan.h>
#include <BLEAdvertisedDevice.h>
#include <Arduino.h>
#include <Adafruit_NeoPixel.h>#define MAX_LIST_NUM 15
#define MAX_DISPLAY_NUM 2 // can display 3 line//add display
#include <Wire.h> // Only needed for Arduino 1.6.5 and earlier
#include "SH1106Wire.h" // legacy: #include "SSD1306.h"
SH1106Wire display(0x3c, 23, 22); String device_list = "A|B|C|D|E|F|G";
String device_list_array[MAX_LIST_NUM] = {
"A","B","C","D","E","F"};
String temp_string = "";int status_dp_list_num = 0;int status_array_num_current = 0;
int status_array_num_max = 6;void setup() {
Serial.begin(115200);Serial.println("Scanning...");//init displaydisplay.init();display.flipScreenVertically();display.setFont(ArialMT_Plain_10);
}void loop() {
Serial.println("in loop");display.clear();display.drawString(0, 0, "light on");display.display();Serial.print("current: ");Serial.println(status_array_num_current);for (int temp=0; MAX_DISPLAY_NUM+1 > temp ; temp++){
//to_string(status_array_num_current)+temp_string = String(status_array_num_current+temp)+" "+device_list_array[status_array_num_current + temp];Serial.println(temp_string);display.drawString(0, 16+16*temp, temp_string);display.display();}delay(1000);status_array_num_current = status_array_num_current+1;if (status_array_num_current >= status_array_num_max-MAX_DISPLAY_NUM)status_array_num_current = 0;Serial.println("out loop");
}
结果1
后续再结合显示匹配的ble device name。
代码2
/*func5.3 display scrolling list */#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEScan.h>
#include <BLEAdvertisedDevice.h>
#include <Arduino.h>
#include <Adafruit_NeoPixel.h>
#include <string.h>#define MAX_LIST_NUM 70
#define MAX_DISPLAY_NUM 2 // can display 3 line//add display
#include <Wire.h> // Only needed for Arduino 1.6.5 and earlier
#include "SH1106Wire.h" // legacy: #include "SSD1306.h"
SH1106Wire display(0x3c, 23, 22); String device_list = "A|B|C|D|E|F|G";
String device_list_array[MAX_LIST_NUM] = {
"A","B","C","D","E","F"};
String device_list_array_ble[MAX_LIST_NUM] = {
};
String temp_string = "";int status_dp_list_num = 0;int status_array_num_current = 0;
int status_array_num_max = 6;bool status_scan_result = false;
String status_scan_result_dp = "";
int status_scan_device_num = 0;const int buttonPin = 2; // the number of the pushbutton pin
bool keyB_status = false;
int buttonState = 0;
Adafruit_NeoPixel pixels(3,17, NEO_GRB + NEO_KHZ800);int scanTime = 5; //In seconds
BLEScan* pBLEScan;//String str1 = "ble_device:";class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
void onResult(BLEAdvertisedDevice advertisedDevice) {
Serial.printf("Advertised Device: %s \n", advertisedDevice.toString().c_str());//Serial.printf("Advertised Device name: %s \n",advertisedDevice.getName().c_str());
// str1.concat(advertisedDevice.getName().c_str());if (status_scan_device_num < MAX_LIST_NUM){
device_list_array_ble[status_scan_device_num] = advertisedDevice.getName().c_str();status_scan_device_num ++;}}
};void led_on(){
pixels.setPixelColor(0, pixels.Color(10, 0, 0));pixels.show();status_scan_result_dp = ""; // Serial.println(status_scan_result_dp);status_scan_result_dp.concat("scaning");display.drawString(0, 0, status_scan_result_dp);display.display();
// Serial.println(status_scan_result_dp);// status_scan_result_dp = "";
// status_scan_result_dp.concat("light on _");
// display.clear();
// display.drawString(0, 0, status_scan_result_dp);
// display.display(); // display.drawString(0, 0, "light on");
// display.display();Serial.println("led_on");
}void led_off(){
pixels.setPixelColor(0, pixels.Color(0, 0, 0));pixels.show();// Serial.println(status_scan_result_dp);status_scan_result_dp.replace("ing","end");status_scan_result_dp.concat(status_array_num_max);display.drawString(0, 0, status_scan_result_dp);display.display();
// Serial.println(status_scan_result_dp);// status_scan_result_dp.concat("light off_");
// Serial.println(status_scan_result_dp);
// status_scan_result_dp.setCharAt(7,'f');
// status_scan_result_dp.replace("on ","off");
// Serial.println(status_scan_result_dp);// display.clear();
// display.drawString(0, 0, "light off");
// display.display();// display.clear();
// display.drawString(0, 0, status_scan_result_dp);
// display.display();Serial.println("led_off");
}void start_scan(){
Serial.println("in scan");status_scan_device_num = 0;// clear devices name list //开始检索附件的蓝牙设备BLEScanResults foundDevices = pBLEScan->start(scanTime, false);Serial.print("Devices found: ");//找到蓝牙设备数目Serial.println(foundDevices.getCount());Serial.println("Scan done!");//清空存储的蓝牙设备信息pBLEScan->clearResults(); // delete results fromBLEScan buffer to release memory// save scan device num and set scan status truestatus_array_num_max = foundDevices.getCount();status_scan_result = true;// Serial.println(status_array_num_max);
// Serial.print("status_scan_result ");
// Serial.println(status_scan_result);Serial.println("out scan");
}void setup() {
Serial.begin(115200);Serial.println("Scanning...");//init displaydisplay.init();display.flipScreenVertically();display.setFont(ArialMT_Plain_10);pinMode(buttonPin, INPUT);BLEDevice::init("esp32-zhangkongban");pBLEScan = BLEDevice::getScan(); //create new scanpBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());pBLEScan->setActiveScan(true); //active scan uses more power, but get results fasterpBLEScan->setInterval(100);pBLEScan->setWindow(99); // less or equal setInterval valueSerial.println("end setup");
}void loop() {
// Serial.println("in loop");//1. get keyB for scan ble devicebuttonState = digitalRead(buttonPin);
// Serial.println(buttonState);if (buttonState == LOW) {
delay(500);if(keyB_status == false){
led_on();keyB_status = true;start_scan();led_off();keyB_status = false;}else{
led_off();keyB_status = false;}}//2. judge scan status for display ble devices which can be connectedif (status_scan_result == true){
Serial.println("display ble list");display.clear();display.drawString(0, 0, status_scan_result_dp);display.display();Serial.print("current: ");Serial.println(status_array_num_current);for (int temp=0; MAX_DISPLAY_NUM+1 > temp ; temp++){
//to_string(status_array_num_current)+temp_string = String(status_array_num_current+temp)+" "+device_list_array_ble[status_array_num_current + temp];Serial.println(temp_string);display.drawString(0, 16+16*temp, temp_string);display.display();}delay(1000);status_array_num_current = status_array_num_current+1;if (status_array_num_current >= status_array_num_max-MAX_DISPLAY_NUM)status_array_num_current = 0;}// delay(1000);
// Serial.println("out loop");
}
结果2
按下keyB，开始检索BLE设备，此时led亮红光，屏幕显示scaning
检索结束后led熄灭，显示scanend和当前检索到的设备数量
部分设备没有获取到name，所以是空的，部分有显示，如图中的红米手表。
滚动显示蓝牙设备名字
