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1  Using Arduino / Sensors / Re: current sensor on: September 01, 2014, 03:45:06 am
yes, seems the ACS712 module is right for your application
2  Using Arduino / Sensors / Re: A lot of flowsensors on: September 01, 2014, 03:42:57 am
my first impression of installing 90 flow sensors with 4 mega:
1.  all the mega reports the results to a "Commander" such as a computer or another arduino. with the results and address itself and sensor address;
2. as the you do not need to "monitor the flow", that't to say, you can check each flow sensor one-by-one, you do not need use interruput to monitor the PWM,  the normal IO would be OK, that to say, check each port (connect the flow sensor) with some duration such as 30s, and calculate the frequency.

So I believe the projects is OK, without multiplexer. as my own experence on using the flow sensor:http://www.elecrow.com/g12-water-flow-sensor-p-790.html, it works perfectly.
3  Using Arduino / Sensors / Re: Multiple DHT22 on same pin? on: September 01, 2014, 03:20:34 am
as my konwledge, NO for the one-wire communication...
4  Using Arduino / Sensors / Re: how is the 4pin plug called (Form saintsmart Sensor shield v4) on: September 01, 2014, 03:05:16 am
you should give other some more information about your problems? does the same same as :http://www.elecrow.com/i2c-1602-lcd-display-module-blue-backlight-p-454.html and sensor shield V4:http://www.elecrow.com/sensor-shield-v40-for-arduino-p-335.html ? if so, i think the jumper wire is the best choice.
5  Using Arduino / Sensors / Re: PIR Sensor: LED keeps blinking non-stop although no detection on: September 01, 2014, 02:53:50 am
Er , Generally speaking, there are 2 protentiometers on the back of the module,  to adjust the duration time and sensitivity.
6  Using Arduino / Sensors / Re: Multiple Analog sensors with pulse sensor sync problem, PLEASE HELP!!! on: August 07, 2014, 11:37:33 pm
you should detailed describe what kind of help you need? hardware of firmware ? or just block diagram. for you digital/analog output sensor, it can be read one by one , and then sent to uart.  for the pulse sensor, it should be dealed in the interrutpur,  and set the flag  no notify the main Loop() than a external interrupt happened. so the LOOP() can get to deal the interruput .
7  Using Arduino / Sensors / Re: Multiple Analog sensors with pulse sensor sync problem, PLEASE HELP!!! on: August 07, 2014, 11:36:47 pm
you should detailed describe what kind of help you need? hardware of firmware ? or just block diagram. for you digital/analog output sensor, it can be read one by one , and then sent to uart.  for the pulse sensor, it should be dealed in the interrutpur,  and set the flag  no notify the main Loop() than a external interrupt happened. so the LOOP() can get to deal the interruput .
8  Using Arduino / Sensors / Re: Problem with an array of soil moisture sensors on: August 07, 2014, 11:30:58 pm
actually, i suggest you using the analog port of all the moisture sensors.  in this way, you can get the relative moisture value of all the sensor, such as this:http://www.elecrow.com/soil-moisture-sensor-p-509.html
9  Using Arduino / Sensors / Re: Problem with an array of soil moisture sensors on: August 07, 2014, 11:27:12 pm
there is a protentiometer on the board to set the Threshold value, to outpout logic High or LOW. try to adjust it .
10  Using Arduino / Sensors / Re: Sensor for weighing objects on: August 07, 2014, 11:12:54 pm
if you want to get relative high-Precision result, i suggest you use the load cell weight sensor and amplifier.  i do not know your mearing range , maybe this would work:http://www.elecrow.com/weight-sensor-kit-3kg-p-883.html
11  Using Arduino / Sensors / Re: ADC Value Problem on: August 07, 2014, 11:07:37 pm
Code:
  //Imput am Pin A2 einlesen
  int sensorValueA2 = analogRead(A2);
  //Den Analogen Wert (welcher von 0 - 1023 reicht) in eine Spanung (0 - 5V) umrechnen
  float Niederschlag = sensorValueA2 * (5.0 / 1023.0);
  if (sensorValueA2 == 5)
{
//Serial.print(Niederschlag);
//Serial.println("0");
return 0;

what do you want to do ? the sensorValueA2 is range from 0 to 1023, and it is not stable, so it is very likly not equal to 5, and the function return 0..
12  Using Arduino / Sensors / Re: ADC Value Problem on: August 07, 2014, 11:06:35 pm
Code:
  //Imput am Pin A2 einlesen
  int sensorValueA2 = analogRead(A2);
  //Den Analogen Wert (welcher von 0 - 1023 reicht) in eine Spanung (0 - 5V) umrechnen
  float Niederschlag = sensorValueA2 * (5.0 / 1023.0);
  if (sensorValueA2 == 5)
{
//Serial.print(Niederschlag);
//Serial.println("0");
return 0;

what do you want to do ? the sensorValueA2 is range from 0 to 1023, and it is not stable, so it is very likly not equal to 5, and the function return 0..
13  Using Arduino / Sensors / Re: Protecting the AD pins on: August 07, 2014, 09:30:18 pm
the design is farily good, i believe the most important problem is :what kind of diodes you use.
14  Using Arduino / Sensors / Re: DHT11 on: August 07, 2014, 09:28:05 pm
detailed usage at :http://www.elecrow.com/wiki/index.php?title=DHT11
hope it helps
15  Using Arduino / Sensors / Re: DHT 11 burnt with external power supply on: August 07, 2014, 09:23:22 pm
as the voltage is alright, the current would not lead to any damage.
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