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You would think that the power module should be able to deliver enough voltage but apparently it isnĀ“t...
I guess there are two possibilities here:

1. You are correct, and the power source is inadequate, i.e. bad choice

2. The power source is fine but you are applying it in the wrong place, i.e. bad practice.

Sensors / Re: Swimming Pool Water Level ...
Last post by scampa - Today at 02:57 am
Looks like the eTape has an operating temp own to 15 degrees Fahrenheit...I'm not sure this will work for me since it gets below zero here at times
Programming Questions / This is driving me crazy
Last post by ubotbuddy - Today at 02:48 am
This is driving me.

There is a page somewhere in the Reference section that shows the commands for keyboard commands.

Like "KEY_LEFT_GUI"  The only one that I found was here:

Is that the only page?  I was thinking there was another that had a lot more options.

Am I wrong?



I've acquired an old car phone and am trying to re-purpose it as an in-car control panel, capable of switching things like fog lights, audio amplifiers, etc as well as displaying information such as temperatures, voltage, etc on the built in LCD.

I plan to do this with an Arduino Uno (outside of the phone which the phone handset will plug into) which will output a small voltage when one of the phone buttons is pressed which will then activate a relay.

I feel this would be relatively easy to do if it was to be built from the ground up (however I am quite new to arduino so this may not be true) but trying to incorporate it into the phone has me stuck.

The main issue I'm hoping someone can help me with is how to run the LCD as well as the 18 buttons with only the 8 wires found in the phone jack. If anyone has any ideas/insight into how this could be done I'd really appreciate it.

I have attached a photo of the phone as well as it's internals.

Thanks in advance,


Sensors / Re: Swimming Pool Water Level ...
Last post by scampa - Today at 02:45 am
@Md500_Pilot ,

Thanks for the reply! The tape looks interesting!! I think I'll order one and run some tests.  I'm in the North East US so it would need to withstand the winter temperatures...I'll check it's specs...

Thanks again!
Sensors / Re: communication between two ...
Last post by jremington - Today at 02:45 am
i want to use this sensors for sending and receiveing some frequency signal based on FSK.
You could use the transmitter and receiver piezo elements, but for FSK signals, you will have to design and build all your own electronics.
That's a very good point; earlier there was talk of eight slaves, but with only two address lines, you're limited to just four.
Would a multiplexer remedy this?
Bar Sport / Re: TCP/IP networking - seekin...
Last post by JMeller - Today at 02:43 am
lol- classes are obsolete(x2); apparently one of 10 ways to get under the skin of IT experts.

Thank you for the time invested in your reply and explanations.  By dumb luck, I was able to communicate across my network with /24 before initiating this thread.  My interest piqued when I read /25,  /26 etc.  After reading, I thought I a fairly good foundation- obviously not the case. 

I'll take the info from this thread and use it to apply to my future reads.

Due to my inept IP understanding, thread is closed.

hi :) . i would to ask some opinion why the voltage value transmit through an offset circuit cannot receive and not appear in serial monitor . idk if my coding could be a problem . i test by wireless without offset circuit the receive show voltage value .I also attach the figure of offset simulation .

Code: [Select]


SoftwareSerial mySerial(2 , 3 );//TX,RX

const int analogInPin = A0;//Analog input pin that the potentiometer
const int analogInPin1 = A1;

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:

// the loop routine runs over and over again forever:
void loop()
int sensorValue1 = analogRead(A0) ; //value read from the pot
int sensorValue2 = analogRead(A1) ;
float voltageValue1 = sensorValue1 * (5.0 / 1023.0); //value outputto the PWM(analog out)
float voltageValue2 =  sensorValue2 * (5.0 / 1023.0);

 Serial.print("\n\nsensor1 = ");
 mySerial.print("\n\nsensor1 = ");
  Serial.print("\t voltage1 = ");
  mySerial.print("\t voltage1 = ");
  Serial.print("\nsensor2 = ");
  mySerial.print("\nsensor2 = ");

  Serial.print("\t voltage2 = ");
  mySerial.print("\t voltage2 = ");


  //wait 2 miliseconds before the nect loop
 delay(1000);        // delay in between reads for stability

Code: [Select]

SoftwareSerial mySerial(2 ,3 );//TX,RX

void setup() {

void loop ()
      String text = mySerial.readString();
      int data =;

Post links to the data sheet or product page of the motors.

Pololu has an excellent collection of motor drivers.
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