Archiv für den Monat: Dezember 2021

Handlicher Suchscheinwerfer

Ich hab mir eine helle Taschenlampe eingebildet.

Da kam mir die Astrolux EC06 im Angebot mit Gutschein für ~64 Euro gerade recht.

Die Lampe ist so groß wie ca. eine Getränkedose 0,33l.

Da drin liefern 3x 21700er LiIonen-Zellen (nicht mitgeliefert) den Saft.

6x Cree XHP50.2 machen Licht. Eine solche kann bis zu 2654lm erreichen. Die Lampe wird mit bis zu 16000lm beworben, könnte also stimmen. Der Strahl ist recht breit.

Die Lampe wiegt leer schon fast 500g.

Man kann sie auch mit USB laden.

Die Steuerung ist Open-Source, Anduril 2. Einfach, aber sehr mächtig.

Wenn man sie anschaltet, ist sie ganz zahm. Per Doppelklick entfaltet sie erst die volle Power – da geht dann die Sonne auf. Es ist blendend hell!

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Arduino on Lilygo OLED Lora ESP32 (board TTGO-Lora32-OLED V1″)

#define USE_OLED

#ifdef USE_OLED
//Libraries for OLED Display
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#include <WiFi.h>
#include <WiFiClient.h>
#include <WiFiAP.h>

const char *ssid = "GPSWIFI";
const char *password = "12345678";

WiFiServer server(80);

const unsigned char ubxRate1Hz[]  = 
  { 0x06,0x08,0x06,0x00,0xE8,0x03,0x01,0x00,0x01,0x00 };
const unsigned char ubxRate5Hz[]  =
  { 0x06,0x08,0x06,0x00,200,0x00,0x01,0x00,0x01,0x00 };
const unsigned char ubxRate10Hz[]  =
  { 0x06,0x08,0x06,0x00,100,0x00,0x01,0x00,0x01,0x00 };
const unsigned char ubxRate16Hz[]  =
  { 0x06,0x08,0x06,0x00,50,0x00,0x01,0x00,0x01,0x00 };

// Disable specific NMEA sentences
const unsigned char ubxDisableGGA[]  =
  { 0x06,0x01,0x08,0x00,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x01 };
const unsigned char ubxDisableGLL[]  =
  { 0x06,0x01,0x08,0x00,0xF0,0x01,0x00,0x00,0x00,0x00,0x00,0x01 };
const unsigned char ubxDisableGSA[]  =
  { 0x06,0x01,0x08,0x00,0xF0,0x02,0x00,0x00,0x00,0x00,0x00,0x01 };
const unsigned char ubxDisableGSV[]  =
  { 0x06,0x01,0x08,0x00,0xF0,0x03,0x00,0x00,0x00,0x00,0x00,0x01 };
const unsigned char ubxDisableRMC[]  =
  { 0x06,0x01,0x08,0x00,0xF0,0x04,0x00,0x00,0x00,0x00,0x00,0x01 };
const unsigned char ubxDisableVTG[]  =
  { 0x06,0x01,0x08,0x00,0xF0,0x05,0x00,0x00,0x00,0x00,0x00,0x01 };
const unsigned char ubxDisableZDA[]  =
  { 0x06,0x01,0x08,0x00,0xF0,0x08,0x00,0x00,0x00,0x00,0x00,0x01 };

#define Battadc 36
#define ADC_FACTOR (0.000635*2.0*1.362)
#define BATT_LOW 3.5

#define SDA 21
#define SCL 22

#ifdef USE_OLED
//OLED pins
#define OLED_SDA 4
#define OLED_SCL 15 
#define OLED_RST 16
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RST);

bool enable_dbg;
bool sig_valid, sig_rxok;
float sig_speed, saved_spd;
int sig_sats;
#define NUM_V_ENTRIES 5
float maxspeed[NUM_V_ENTRIES];
int vbatt;

// Cut out the wanted substring from a comma-separated string
static String extract_val(char *buf, int len, int cpos)
  String str="";
  int i,cc=0,cs=0,ce=255;
  for (i=0;i<len;i++) {
    if (buf[i]==',') {
      cc++; // count commas
      if(cc==cpos) cs=i+1;
      if(cc==cpos+1) {ce=i; break;}
    else if (buf[i]=='*' || buf[i]=='\r')
  if (cs == 0) // no comma seen - no result
    return str;
  int s = min(ce-cs, 255);
  for (i=0; i<s; i++) // build string, could be nicer...
//  memcpy(tgt, &buf[cs], s);
  return str;

void parse_gps(char c) {
  static char buf[127];
  static int pos=0;
  if (c=='\n') {
    if (buf[2]=='V' && buf[3]=='T' && buf[4]=='G') {
      sig_rxok = true;
      String s = extract_val(buf, pos, 7);
      if (s.length() > 0)
        sig_valid = true;
      sig_speed = s.toFloat();
      saved_spd = sig_speed;
    else if (buf[2]=='G' && buf[3]=='G' && buf[4]=='A') {
#ifdef USE_OLED
      String s = extract_val(buf 

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, pos, 7); Serial.println(s); sig_sats = s.toInt(); } } else if (c=='$') pos=0; else if (pos < sizeof(buf)) buf[pos++] = c; } //Warteschleife, die ankommende Daten vom GPS Modul verarbeitet und den Status des Tasters prüft static void smartdelay(unsigned long ms) { unsigned long start = millis(); do { while (Serial2.available()) { char; parse_gps(c); if (enable_dbg) Serial.print(c); //display.print(c); } //display.display(); } while (millis() - start < ms); } static void sendUBX( const unsigned char *progmemBytes, size_t len ) { Serial2.write( 0xB5 ); // SYNC1 Serial2.write( 0x62 ); // SYNC2 uint8_t a = 0, b = 0; while (len-- > 0) { uint8_t c = ( *progmemBytes++ ); a += c; b += a; Serial2.write( c ); } Serial2.write( a ); // CHECKSUM A Serial2.write( b ); // CHECKSUM B delay(100); } static void updateRate() { sendUBX(ubxRate5Hz, 10); } void setup() { pinMode(0, INPUT_PULLUP); // button pinMode(SCL, INPUT_PULLUP); // I2C of GPS compass pinMode(SDA, INPUT_PULLUP); // analogSetAttenuation(ADC_0db); // control sensitivity; ADC_11db, ADC_6db, ADC_2_5db, ADC_0db // pinMode(Battadc, INPUT); // adcAttachPin(Battadc); Serial.begin(115200); // debug Serial2.begin(9600,SERIAL_8N1,12,13); // GPS #ifdef USE_OLED //reset OLED display via software pinMode(OLED_RST, OUTPUT); digitalWrite(OLED_RST, LOW); delay(20); digitalWrite(OLED_RST, HIGH); //initialize OLED Wire.begin(OLED_SDA, OLED_SCL); if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3c, false, false)) { // Address 0x3C for 128x32 //Serial.println(F("SSD1306 allocation failed")); for(;;); // Don't proceed, loop forever } #endif // setup WIFI server WiFi.softAP(ssid, password); IPAddress myIP = WiFi.softAPIP(); // usually server.begin(); #ifdef USE_OLED display.setTextColor(WHITE); display.setTextSize(1); display.clearDisplay(); display.setCursor(0, 0); display.println("Simon's WIFI GPS"); display.println("IP address:"); display.println(myIP); display.display(); #endif delay(2000); sendUBX(ubxDisableGLL, 12); sendUBX(ubxDisableGSA, 12); sendUBX(ubxDisableGSV, 12); sendUBX(ubxDisableRMC, 12); sendUBX(ubxDisableZDA, 12); Serial2.print("$PUBX,41,1,0007,0003,19200,0*25\r\n"); Serial2.flush(); delay(100); Serial2.end(); Serial2.begin(19200,SERIAL_8N1,12,13); delay(1000); updateRate(); } void wifi() { WiFiClient client = server.available(); // listen for incoming clients if (client) { // if you get a client, char i; Serial.println("New Client."); // print a message out 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 =; // read a byte, then // Serial.write(c); // print it out the serial monitor 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, so send a response: 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: client.println("HTTP/1.1 200 OK"); client.println("Content-type:text/html"); client.println(); // the content of the HTTP response follows the header: char tmp[32]; client.print("<html><head><meta http-equiv=\"refresh\" content=\"10; URL=/\" /></head>"); client.print("<body style=\"background-color:black;\"><h1 style=\"color:white;font-size:80px\">Simon's WIFI GPS</h1>"); client.println("<p style=\"color:white;font-size:60px\"><b>"); sprintf(tmp, "Max = %4.1f km/h", maxspeed[0]); client.print(tmp); client.println("</p><p style=\"color:white;font-size:30px\">"); for (i=1;i<NUM_V_ENTRIES;i++) { sprintf(tmp, "%4.1f km/h", maxspeed[i]); client.print(tmp); client.println("<br>"); } sprintf(tmp, "<br>Batt = %2.3f V", (float)vbatt*ADC_FACTOR); client.print(tmp); client.println("<br>"); sprintf(tmp, "<br>Signal rx ok = %d", sig_rxok); client.print(tmp); client.println("<br>"); sprintf(tmp, "<br># of satellites = %d", sig_sats); client.print(tmp); client.println("<br>"); client.print("<br><br><a href=\"/R\">RESET</a> Vmax.<br></p></body></html>"); // 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 } // Check to see if the client request was "GET /H" or "GET /L": if (currentLine.endsWith("GET /R")) { for (i=0; i<NUM_V_ENTRIES; i++) maxspeed[i] = 0.0; } } } // close the connection: client.stop(); // Serial.println("Client Disconnected."); } } void loop() { int i; bool spdwritten = false; char tmp[32]; float spd; smartdelay(0); #ifdef USE_OLED display.clearDisplay(); // drawString(x,y,text);? or ACROBOTIC_SSD1306 with setTextXY/putString display.setCursor(0, 0); #endif if (sig_valid) { spd = sig_speed; sig_speed = 0.0; // show maximum speed, with 5 places to see glitches #ifdef USE_OLED display.println("Geschwindigkeit (max)"); #endif for (i=0; i<NUM_V_ENTRIES; i++) { if (spd > maxspeed[i] && !spdwritten) { maxspeed[i] = spd; spdwritten = true; break; } } #ifdef USE_OLED for (i=0; i<NUM_V_ENTRIES; i++) { if (i==0) display.setTextSize(2); sprintf(tmp, "%4.1f km/h", maxspeed[i]); display.println(tmp); if (i==0) display.setTextSize(1); } // show current speed sprintf(tmp,"S%4.1f Sats %3d", saved_spd, sig_sats); display.print(tmp); } else { display.println("No GPS fix."); if (sig_rxok) display.println("GPS RX ok"); sprintf(tmp," Sats %3d", sig_sats); display.print(tmp); #endif } vbatt = analogRead(Battadc); #ifdef USE_OLED if ((float)vbatt*ADC_FACTOR < BATT_LOW) { display.setCursor(108, 32); display.print("LOW"); } display.display(); #endif if (digitalRead(0)==0) { // clear for (i=0;i<NUM_V_ENTRIES; i++) maxspeed[i] = 0.0; #ifdef USE_OLED display.clearDisplay(); #endif } wifi(); }

Linux DLNA-Server

installiere minidlna (nach

sudo apt-get install minidlna

setze interface z.B. wlo1

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,/var/lib/minidlna/videos media_dir=A,/var/lib/minidlna/music

kopiere Zeug in /var/lib/minidlna

gib Rechte 644 auf die Dateien

find /var/lib/minidlna/videos -type f -exec chmod 0644 {} \;

restart server

Final Fix

Edit /etc/default/minidlna to contain (and also /lib/systemd/system/minidlna.service)


Then /etc/minidlna.conf to contain


I also had to change permissions to allow my user

sudo chown simon:simon /var/cache/minidlna
sudo chown simon:simon /run/minidlna

Then restart the service

sudo service minidlna restart

sudo service minidlna force-reload