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1  Using Arduino / General Electronics / Re: Capacitor transistor problem on: August 01, 2014, 07:42:30 pm
Hi, I think Thereminx is doing it this way to understand the electronic circuitry rather than the programming.

Good first attempt, and MarkT's circuit will do what ThereminX is trying out.

Tom....... smiley
2  Using Arduino / Project Guidance / Re: how to get correct counter on: August 01, 2014, 06:55:32 pm
Hi, apart from what rashemmel has said, what do you expect to get from input 0, it the serial Rx pin, so it will be data stream from the Bluetooth.
If you are trying to measure the number of messages you receive from the Bluetooth, you will need to count the number of times
Code:
voice +=c;
occurs?

Can you edit your post and use code # tags to display your sketch, please.
Also an explanation of what you are trying to do overall will help us, you have all the info and we need it so we can give you answers that are going to help you in the quickest time.

I ASSUME you have a PC that sends via Bluetooth the characters "good morning", "hi world" then the arduino responds by configuring the output LEDs and/of the motor driver?

Tom.... smiley
3  Using Arduino / General Electronics / Re: Arduino and N-Channel Mosfet: half on? on: August 01, 2014, 10:02:45 am
Hi, if changing the mosfet does not fix the problem, and you had these PCBs made, can you post a copy of the PCB patterns, in jpg, png or pdf please.

I note that the mosfet is only rated for Vds of 20V, even though you are only using 12V, I would have chosen a MOSFET with  40V or more.

Tom..... smiley
4  Using Arduino / General Electronics / Re: Arduino and N-Channel Mosfet: half on? on: August 01, 2014, 04:59:19 am
Hi, you need the LED in parallel with the gate-source circuit.

TOM..... smiley
5  Using Arduino / Project Guidance / Re: Advice on smoke detector disabler project on: July 30, 2014, 04:34:09 pm
Hi, DO NOT disable smoke detectors, place them where they will not be affected by the kitchen cooking.

I have just has my house audited for smoke detectors and they must be placed outside bedroom doors, no requirement for kitchen installations. (In Australia)

If you are setting off the detector in the kitchen then install a ventilation fan or find a place away from the main cooking area.
I'd say that much smoke would be unhealthy for you anyway.

Detecting heat and then disabling the sensor, how do you know that the heat is not from an unintentional fire? 30mins and it would be all over.

Never fool with life saving safety detecting devices.

Tom...... smiley
6  Using Arduino / Project Guidance / Re: Feedback problem? on: July 30, 2014, 04:07:13 am
Hi, what do you plan to accomplish with  your sparker project?

Running an EHT arcing device near any electronic equipment without any knowledge of what it is doing is courting disaster, but with the electronic equipment connected to the equipment it is inviting disaster.

DO NOT  run your "sparker" until you know what it is doing, or  you have enough money for a new arduino, new computer and doctors bills for electric shocks.

Tom...... smiley

7  Community / Bar Sport / Re: Arduino popping up in movies/documentaries on: July 29, 2014, 05:11:46 pm
Hi, not so much TV, movies but in the media.

http://www.itwire.com/it-industry-news/development/64922-team-gearbox-takes-out-sydney-battlehack


Tom...... smiley
8  Using Arduino / Project Guidance / Re: DB25 won't send pulses to MicroStep Driver on: July 29, 2014, 04:49:53 pm
Hi, please post your sketch in code tags #, and can you post a circuit diagram, CAD or picture of hand drawn circuit in jpg, png or pdf format.
Also a picture of your project.
Have you got gnd of the arduino connected to the gnd of the drivers and how are you supplying power to the drivers and motors.

Hope to help.

Tom.... smiley
9  Using Arduino / Programming Questions / Re: Hall in D2 + Timer0 sketch to count frequency = bizarre result on: July 29, 2014, 04:29:51 pm
Hi good to hear that things are working.

Glad to have helped.

Tom........ smiley
10  Using Arduino / General Electronics / Re: About Omron G5V-2 5v relay on: July 29, 2014, 05:55:38 am
Hi, the maximum switching voltage is 125Vac or 125Vdc, so your 220Vac is to high unfortunately.

The 750Vac and 1000Vac are the insulation breakdown voltages between the contacts (750Vac) and the Coil and Contacts (1000Vac).

Tom.... smiley
11  Using Arduino / Project Guidance / Re: Need guidance interfacing quadrature encoder that can pulse up to 500khz on: July 29, 2014, 05:23:12 am
Hi, if you use a stepper to control the tool, and it works in steps, how are you going to get a smooth thread.
Just asking.

Tom..... smiley
12  Using Arduino / General Electronics / Re: Switching the Dimmer 'on' and 'off' affects my computer on: July 28, 2014, 09:10:54 am
Hi, in your circuit diagram you show the coil of the relay connected to the output of the arduino and "gnd" which is part of the 220Vac supply.

Is that correct?

If so, turn it off and don't use it.

Can you post an accurate circuit diagram of the arduino, relay board connections and the lamp connections please.

Even a picture of a hand drawn diagram will be good, in jpg, png or pdf format.

Tom....... smiley
13  Using Arduino / Project Guidance / Re: 20x4 SC204A DigiTron LCD Problem on: July 28, 2014, 04:17:19 am
Hi,can you post a copy of your sketch and a copy of your circuit diagram, either CAD or picture of hand drawn circuit, in jpg, png or pdf.

This way we will be able to see what you are inquiring about and give accurate answers.

Tom...... smiley
14  Using Arduino / Project Guidance / Re: Damaged Arduino, Hard Drive, and USB Hub on: July 27, 2014, 09:21:04 pm
Hi since when has 2N2222 been PNP?
Its and NPN transisor.
And where is the base current limit resistor?

Tom..... smiley
15  Using Arduino / Programming Questions / Re: Very strange LED cube error on: July 27, 2014, 04:47:16 pm
Hi, just a thought, if you are using arrays, then element   0 to 63 will be 64 elements. The 64th will be array number 63.

Sorry but I have not had enough time this morning to read your sketch, coffee just taking effect, but it sounds like you are trying to turn on a LED that is not there.

Just a thought.

Tom...... smiley
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