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Website Questions / Micromag units of measurement for readings
« Last post by ZPMMaker on November 28, 2017, 08:34:45 AM »

I'm working with the MicroMag 3-axis magnetometer, as described at

The script provided there (which runs on Arduino) outputs three readings (mag field x,y,z) to serial output/USB.

However, the script doesn't say what units the magnetic field readings are provided in.

Does anyone know what these are?

Thanks in advance.  :)
Electronics Questions / Re: Controlling 400 LED
« Last post by Sibiler on November 15, 2017, 04:52:50 AM »
I couldnt stop here am tell u guys my oppinion, i love when on forums are nice and helpfull people like here, great community!!
General Discussion / auto/ manual wiring circuit diagram
« Last post by smsebna on September 23, 2017, 04:13:33 PM »
Hello everyone

I have a question about wiring circuit diagram.

I have one motor that turn right and left, with selector switch.

These are my steps:

1. If operator select auto mode, in1 is activated , so out 1 or out2 is activated, according to program of PLC, motor is turned to right or left.
2. If operator select manual mode, in2 is activated, so out3 is activated, and operator can select turn right or turn left the motor.
The problem is :

When operator turn left the motor, out3 connected to out1 reversely. And when operator turn right the motor, out3 connected to out2 reversely.

How I can fix these problems?
Wiring Hardware Questions / Short Cirtcuting Motherboards
« Last post by Pyro on July 19, 2017, 09:21:32 PM »
ive started messing whit circuits recently but there is a problem , when i short something my breaker switch always switches off (not fully) and im using that extesion whit a switch but it dosent help. anyone know how i can stop this?
Electronics Questions / What's wrong with my led driver circuit?
« Last post by Wennie on May 11, 2017, 02:51:36 AM »
Excuse me if my question is too specific. I'm trying to get an LED driver using PT4115 work. I've spent hours but no success. I've created exactly the circuit depicted in the datasheet.

I have used 0.33ohm resistor (0.300mA), 95uH inductor, 100uF capacitor and 1N5819 diode. I've checked all parts a hundred times. When I power the circuit with 12V DC I measure 4.3V at the DIM pin, I think this is a good sign the chip is working. But when I put a resistor as the load it seems as if this is short circuit and I get no constant current, for example with 22ohms I get 520 mA instead of expected 300 mA. I have no experience with buck convertors, what can be wrong?

Electronics Questions / Raspberry Pi wiring simple LED
« Last post by kayden on February 28, 2017, 10:22:58 PM »
I'm completely new to hardware in general. I just got a raspberry pi and was messing around trying to get an LED to light up.

I have everything wired like the picture below. I am using a 330ohm resister, which I believe is bigger therefore ok then what is required.

also (sorry this is my first time using any program to draw a circuit)

The program runs successfully, but no light comes on. I know the LED is good as I've tested it on the arduino. Anybody care to explain my wiring fault?
root@raspberrypi:/home/pi# cat
import RPi.GPIO as GPIO

GPIO.setup(11, GPIO.OUT)

GPIO.output(11, True)
Changing to GPIO pin 0 results
Traceback (most recent call last):
  File "", line 5, in <module>
    GPIO.setup(0, GPIO.OUT)
RPi.GPIO.InvalidChannelException: The channel sent is invalid on a Raspberry Pi
Project Questions / Guidelines / Re: Trouble with trailer wiring...NEED HELP!!!
« Last post by Soupy on February 10, 2017, 01:20:00 AM »
hi, this forum is about the project but let's see if someone could help.

Hi Jerrod did you solve this?
Programming Questions / Connect Thermal Print from SPARKFUN to Wiring
« Last post by AnaMaria on November 07, 2016, 05:13:03 PM »
In advance, thank you very much for your help,
I write because I have a doubt with a wiring code, i want to know if you can helpme to solve it. I'm trying to connect the thermal printer from Sparkfun to wiring and then, use it with Wiring S.The code have this error:

error: 0:
/Applications/ error: conflicting return type specified for 'virtual void SoftwareSerial::write(uint8_t)'
In file included from /Applications/,
prueba1:-1: error: /Applications/ error:   overriding 'virtual size_t Print::write(uint8_t)'

Here is the code ..

#include <SoftwareSerial.h>
SoftwareSerial Thermal(2, 3);
int heatTime = 80;
int heatInterval = 255;
char printDensity = 15;
char printBreakTime = 15;
void setup()
 Serial.begin(57600); // for debug info to serial monitor
 Thermal.begin(19200); // to write to our new printer
void initPrinter()
 //Modify the print speed and heat
 Thermal.write(7); //Default 64 dots = 8*('7'+1)
 Thermal.write(heatTime); //Default 80 or 800us
 Thermal.write(heatInterval); //Default 2 or 20us
 //Modify the print density and timeout
 int printSetting = (printDensity<<4) | printBreakTime;
 Thermal.write(printSetting); //Combination of printDensity and printBreakTime
 Serial.println("Printer ready");
void loop()
 Thermal.println(" Visit ");
 Thermal.write(10); //Sends the LF to the printer, advances the paper
 Thermal.print(" Millis = ");
 do { } while (1>0);
General Discussion / Help with a simple robot
« Last post by hannahrae on October 10, 2016, 08:20:20 PM »
My grandsons fell in love with this cute little robot and want to build it but the wiring is not clear to me. I have no experience with wiring. Can someone help me by drawing a diagram or explaining how to wire the battery, switch, and motors together? Thank you!
Wiring Hardware Questions / Astrology And Horoscope @
« Last post by hadgvin1 on September 03, 2016, 08:18:32 AM »
Horoscope Point provides detailed information about virgo Zodiac signs. What is personality virgo person, and how to up and down virgo person life in future? You can get know about virgo nature, friend and family, education and career, love marriage, virgo like and dislike. More at
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