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31  Using Arduino / General Electronics / Re: what's this phenomenon called? on: August 11, 2014, 03:30:09 am
But when you use ground between the 2 voltages we get a voltage shift, anyone know the name of this?

Bipolar Power Supplies
32  Using Arduino / General Electronics / Re: High current Measuring sensor on: August 11, 2014, 02:51:50 am
You can use HCPL-7520 linear optoisolator in circuit to isolate the high voltage.

http://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/s2008/cj72_xg37/cj72_xg37/index.html
33  Community / Gigs and Collaborations / Re: Arduino Timer/Clock on: August 10, 2014, 10:22:54 pm
hmm but is there a way to use thus
Your image had error & can not display.
34  Using Arduino / Programming Questions / Re: Example needed for DS3231 AT24C32 IIC Precision RTC on: August 09, 2014, 01:37:07 am
http://forum.arduino.cc/index.php/topic,211409.0.html
http://playground.arduino.cc/Code/I2CEEPROM24C1024#.UxMweON5PoE
https://github.com/rodan/ds3231
https://github.com/akafugu/ds_rtc_lib
35  Community / Gigs and Collaborations / Re: Arduino Timer/Clock on: August 08, 2014, 10:55:51 am
i try using a speaker it nv have any beep sound just lthe keypad showing alert alert alert

Is this type of Buzzer not speaker, Buzzer only need to supply voltage it will sound.


36  Community / Gigs and Collaborations / Re: Arduino Timer/Clock on: August 06, 2014, 04:58:40 pm
hi which is the output for the buzzer smiley
Buzzer output on Analog input pin A1
37  Using Arduino / Project Guidance / Re: How to log voltage and current? on: August 06, 2014, 09:55:25 am
For high current don't use resistor, use Hall Effect Current Transducer like this one

http://uk.rs-online.com/web/p/current-transducers/3019473/?origin=PSF_421334|alt
38  Using Arduino / Project Guidance / Re: Arduino controlled DC-DC boost power supply on: August 05, 2014, 07:08:05 am
Look at this circuit

http://cr4.globalspec.com/thread/91098/Power-Supply-DC-DC-step-up-converter-problem

The pot will have to work with high voltage up to 80V

MCP4151 digi pots only good for about 5V and 2.5mA
39  Using Arduino / Project Guidance / Re: Low power project and batteries on: August 04, 2014, 10:09:51 am
Quote
Further tests show that if you disable the brown-out detection (by changing a fuse byte) you can greatly save power, especially in sleep mode. With brown-out detection disabled power consumption goes down to around 6 uA. This is because the brown-out detection needs an internal voltage reference to be running.
http://www.gammon.com.au/forum/?id=11149
http://gammon.com.au/forum/?id=11497
40  Using Arduino / Project Guidance / Re: Robot supply problem on: July 31, 2014, 05:45:25 am
How you connect you motors? direct supply from the battery? or supply from the 5V 7805?
41  Using Arduino / Project Guidance / Re: double IF statement? Double Conditional? on: July 30, 2014, 04:54:06 pm
Use IF statement
Code:
if ((led13State == LOW) && (analogValue > threshold))
42  Using Arduino / Programming Questions / Re: programming for LCD Module 1602, I see this error. on: July 29, 2014, 11:52:14 am
Code:
LiquidCrystal_I2C lcd (0x27, 16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display

43  Using Arduino / Programming Questions / Re: programming for LCD Module 1602, I see this error. on: July 29, 2014, 06:15:47 am
I can't figure what this is for
Code:
line display
so I'm not surprised the compiler is also having trouble.

...R

line display was part of the comment.
44  Using Arduino / Project Guidance / Re: Using intel Galileo for auto alarm clock on: July 28, 2014, 04:00:28 am
Look at this Clock


http://thekemley.blogspot.be/2012/09/arduino-led-display-clock-project-this.html

Arduino Mega will do.
45  Using Arduino / Project Guidance / Re: Controlling TRIAC using DIGITAL pot for a 220v 500w dimmer on: July 18, 2014, 07:33:34 pm


T1 conducts when the optocoupler sends a pulse to its base. C1 discharges through the collector-emitter line.
The trigger current is limited by R2 to around 40 mA.
The discharge current time of C1 is less than 1 ms.

http://www.electroschematics.com/6561/universal-triac-control-with-optocoupler/
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