Posts made by 3nibble

Thanks,
A 3D-printed tipping bucket would certainly be an easy solution. I wonder whether there is a sensor, which is able to somehow directly "read" the volume. I understand, there is the difficulty of heavy fluctuations in volume, which the bucket avoids. But I could imagine there are for example medical applications which have to deal with similar requirements/difficulties.

My gas heater produces condensate. The ratio condensate per gas shows the efficiency of the combustion which is what I want to track.
Condensate drips from the heater, i. e. no pressure, just dripping water. Volume might range from zero to maybe 10 or 15 litres a day.

I am looking for a sensor I can hook onto an Arduino or even better a sensor which I can connect to my existing 1-wire network.

Thanks for hints.

3nibble

@alexelite said in Killing Nanos, one after the other:

Do you have a digital multimeter (DMM)? You can measure the voltage between gnd and both lead of the diode.

Yes, I have one. For both MPs I got
GND vs the "B-side" of "B2" 0.0V
GND vs the "2-side" of "B2" 4.97V

The Diode-Test-Function shows .0L in one direction and 1.9 running down fast to .0L in the opposite direction.

Does this tell us the diodes do their job?

Regards shortening the diode, I am not sure whether I have means or the ability to solder on a bridge across this tiny part.

Kind regards,

@alexelite said in Killing Nanos, one after the other:

You shorted the power supply. This will not kill your MCU or usb-serial chip.

Well, I hope, you are right.

Here are the pictures.

DeadNanoNo1

DeadNanoNo2

Thanks,

EDIT:

Found my mistake. I just had a false understanding of the breadboard's rails by thinking of them as individually isolated groups of 5 pads. Now all is well.

Interestingly, the current Nano survived the abuse.
So back to question No 1: is there a way to rescue the apparently dead Nanos?

Thanks.

Thanks for your replies.

Just killed another one.

Compiled the sketch, flashed a naked Nano that connected to my PC without any problem.
The Arduino IDE said "Sketch flashed successfully". The Nano showed a green LED blinking.
I pulled the Nano off of the PC and put it on the breadboard as shown in the pictures below. Reconnecting it to the PC just proved I had killed the third one. No signs of life - nothing.

@r-nox
I am on Linux

@alexelite
This is my breadboard setup:

This is my code:

I took it from here
https://www.arduino-projekte.de/index.php?n=64
and only changed the data bus pin from 10 to 3.

#include <OneWire.h>

// OneWire DS18S20, DS18B20, DS1822 Temperature Example
//
// http://www.pjrc.com/teensy/td_libs_OneWire.html
//
// The DallasTemperature library can do all this work for you!
// http://milesburton.com/Dallas_Temperature_Control_Library

OneWire  ds(3);  // on pin 3

void setup(void) {
  Serial.begin(9600);
}

void loop(void) {
  byte i;
  byte present = 0;
  byte type_s;
  byte data[12];
  byte addr[8];
  float celsius, fahrenheit;
  
  if ( !ds.search(addr)) {
    Serial.println("No more addresses.");
    Serial.println();
    ds.reset_search();
    delay(250);
    return;
  }
  
  Serial.print("ROM =");
  for( i = 0; i < 8; i++) {
    Serial.write(' ');
    Serial.print(addr[i], HEX);
  }

  if (OneWire::crc8(addr, 7) != addr[7]) {
      Serial.println("CRC is not valid!");
      return;
  }
  Serial.println();
 
  // the first ROM byte indicates which chip
  switch (addr[0]) {
    case 0x10:
      Serial.println("  Chip = DS18S20");  // or old DS1820
      type_s = 1;
      break;
    case 0x28:
      Serial.println("  Chip = DS18B20");
      type_s = 0;
      break;
    case 0x22:
      Serial.println("  Chip = DS1822");
      type_s = 0;
      break;
    default:
      Serial.println("Device is not a DS18x20 family device.");
      return;
  } 

  ds.reset();
  ds.select(addr);
  ds.write(0x44,1);         // start conversion, with parasite power on at the end
  
  delay(1000);     // maybe 750ms is enough, maybe not
  // we might do a ds.depower() here, but the reset will take care of it.
  
  present = ds.reset();
  ds.select(addr);    
  ds.write(0xBE);         // Read Scratchpad

  Serial.print("  Data = ");
  Serial.print(present,HEX);
  Serial.print(" ");
  for ( i = 0; i < 9; i++) {           // we need 9 bytes
    data[i] = ds.read();
    Serial.print(data[i], HEX);
    Serial.print(" ");
  }
  Serial.print(" CRC=");
  Serial.print(OneWire::crc8(data, 8), HEX);
  Serial.println();

  // convert the data to actual temperature

  unsigned int raw = (data[1] << 8) | data[0];
  if (type_s) {
    raw = raw << 3; // 9 bit resolution default
    if (data[7] == 0x10) {
      // count remain gives full 12 bit resolution
      raw = (raw & 0xFFF0) + 12 - data[6];
    }
  } else {
    byte cfg = (data[4] & 0x60);
    if (cfg == 0x00) raw = raw << 3;  // 9 bit resolution, 93.75 ms
    else if (cfg == 0x20) raw = raw << 2; // 10 bit res, 187.5 ms
    else if (cfg == 0x40) raw = raw << 1; // 11 bit res, 375 ms
    // default is 12 bit resolution, 750 ms conversion time
  }
  celsius = (float)raw / 16.0;
  fahrenheit = celsius * 1.8 + 32.0;
  Serial.print("  Temperature = ");
  Serial.print(celsius);
  Serial.print(" Celsius, ");
  Serial.print(fahrenheit);
  Serial.println(" Fahrenheit");
}

Any ideas?

Thank you.

@Guillermo-Schimmel said in Selecting a Controller:

yes, you can talk directly to the ethernet gateway

Could you please point me to an example or any documentation about how to do this?
Thanks.

Is there a way to talk to the gateway (ethernet or USB) without any particular controller-package? I would prefer linux shell scripts instead, as this is how I collect data from all my wired sensors.

Happy New Year everybody!

First post, so please bear with me.

I have got five Arduino Nanos with FTDI chip (far east replicas). When connected one to my PC (Ubuntu 20.04) they are immediately detected as valid and working USB devices:

lsusb
ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC

dmesg | grep ttyUSB
FTDI USB Serial Device converter now attached to ttyUSB0

Using the Arduino IDE 2:1.0.5+dfsg2-4.1 I even could flash sketches successfully. No problem, whatsoever.

BUT: as soon as I put the Nano onto a breadboard, set up my circuit (two DS18B20 one 4.7k Resistor and 8 wires) and connect it to the PC to flash it, it's dead. After taking it off from the breadboard it's no longer detected as USB device. Plugging it out and back in does not help. It is no more, it has ceased to be, it is an ex-Nano - so it seems at least.

I have read about missing bootloaders and flashing through another Nano's ICSP interface. But even if this was possible, hadn't the nano then at least to be seen by the PC? Is the bootloader a prerequisite for the FTDI to work and make itself detected?

Already killed two, three to go.

Is there a way to bring these dead Nanos back to life?

Any help is very much appreciated.

Thank you.

3nibble

Hi there,
I am on Linux - exclusively! Does that mean I am out even before I started?
3nibble (puzzled)