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1  Using Arduino / Microcontrollers / Re: ATmega168 Programming: Which board to use? on: September 09, 2014, 12:58:12 pm
You'd need a bootloader change to receive the sketch to be loaded via I2C vs Serial.

Even then the arduino IDE cannot 'talk I2C' to a target arduino board?

2  Using Arduino / Microcontrollers / Re: ATmega168 Programming: Which board to use? on: September 09, 2014, 12:51:44 pm
Slightly off-topic. But is it possible to program a ATmega168 using the I2C pins? Not the bootloader, but just the programs?

Nope. Your choices are either using the serial USB link using a bootloader or the ICSP pins and a hardware programmer (if even another arduino running the arduinoISP sketch.

3  Using Arduino / Programming Questions / Re: Problems with Serial.begin on: September 07, 2014, 12:01:45 pm
What version of the Arduino IDE are you using?
4  Using Arduino / Storage / Re: How uploaded code are save in the arduino? on: September 07, 2014, 11:35:37 am
Yes - after a slight pause if you used a bootloader to install the sketch.  
It will start with no delay if you used File:Upload Using Programmer and loaded the sketch via the ICSP header using an In System Programmer (ISP) such as Atmel AVR ISP MKii, or an Arduino that was programmed to act as an ISP.

Thank you. Is the reset button on the Arduino to erase all the memory?

No, reset does not erase any code (flash memory), it just causes a restart of the code.

5  Using Arduino / Motors, Mechanics, and Power / Re: Supply Current for Relays on: September 06, 2014, 10:59:34 am
I'm flipping up to 16, 5V relays. Each relay needs 15-20 mA. The MEGA can source 40 mA per pin, and 800 mA overall, though only so much current to a group of pins ( There are other components to this project that will take up power too, and I want to be as gentle on the arduino as possible.
Has anyone heard of such a product or circuit? Thanks.

 Keep in mind that there are two 'current loads' that the relay board presents. First is the digital inputs of the relay board, most use a opto/led input that require about 20 ma per relay channel to turn on. The second load is the relay's coil consumption, and depends of the specific relays used in the module. As far as being able to power all 16 relay channels at the same time while being powered by the arduino's 5V pin that would probably be more then the arduino can supply. Powering the relay board with an external regulated +5vdc of sufficient current rating is probably called for.

6  Using Arduino / Project Guidance / Re: My programs runs on Arduino Uno but not on Arduino Nano on: September 06, 2014, 10:13:34 am
I have been working a board layout for a data logger and from what I have found, the NANO does not have a 3.3v regulator on board.    visual inspection of my NANO confirms that as well.

only when power is fed into the USB port and then into the USB chip, does the USB chip output 3.3v power.

I wound up using a separate 3.3v regulator and went with a 3.3v mini for my project.

 That is incorrect. The Nano (version 3.0 anyway) does have a regulated 3.3vdc output available. However it's an internal 3.3vdc regulator built into the FTDI USB chip and has a maximum output current capacity of like 40 mA. The FTDI chip has power applied to  it even if not plugged into a PC. Both the FTDI and 328P chip are powered from the same board's Vcc source.
7  Development / Other Software Development / Re: Software to programming with logic blocks on: September 03, 2014, 01:26:20 pm
Looks like a reinvention of PLC ladder logic programming?

8  Using Arduino / Project Guidance / Re: Is it possible to use CP2102 instead of ATMEGA16U2 on custom project on: August 26, 2014, 11:28:29 am
Thank you very much for the answer.

But do I have to install any thing like a firmware on the CP2102 or just plug it to the USB port on my PC?

You only have to install the correct USB driver that supports the CP2102, no other software or firmware required. This driver is not supplied with the Arduino IDE so you will have to locate it on the web. Some sellers on E-bay of CP2102 modules show a link to it's USB driver files.

9  Using Arduino / General Electronics / Re: Whats are the holes on this relay for? on: August 21, 2014, 11:45:27 am
You are wiring it improperly if you are using the two end terminals. And as your light is most likely household AC voltage you are in some danger trying to learn as you go. Learn to use the relay with low voltage DC until you understand the NO/C/NC contacts and how they are used in your external circuit.

10  Using Arduino / General Electronics / Re: How to connect V 4-Channel Relay Module to Arduino on: August 19, 2014, 07:22:02 am
I purchase V 4-Channel Relay Module Low Level Trigger with Opto coupler for Arduino
What kind of External power supply need to this relay.  It work with 5 volt but how much current need ?.
And how do I connect it together with  Arduino board ?

If it's typical of many Asian e-bay type relay modules the hook-up would be as follows:

1. ground to ground
2. 4 relay channel input pins wired to 4 arduino digital output pins
3. Board Vcc power to arduino 5V pin, 4 relay coils won't 'overload the Arduino board's 5 vdc.
4. The board my have a movable jumper for power, be sure it is proper position to be powered from Arduino.
5. As you stated in your coding a digitalWrite(pin#,LOW) will turn on the relay channel.

Good luck

11  Using Arduino / Sensors / Re: Rotary encoder troubleshooting on: August 14, 2014, 01:44:42 pm
no one?

Sure. Bet you are using an inexpensive mechanical encoder switch rather then a more expensive optical or magnetic encoder? If so the dreaded "switch contact bounce" is causing your problem of random intermittent multiple steps.  
12  Using Arduino / General Electronics / Re: 4x AA Ni-Mh voltage drop on load on: August 14, 2014, 01:39:37 pm
You guys keep talking of battery packs problem is i cant seem to find anything for a good price!
On ebay  most of them are fake, local stores only have this batteries for digital cameras where can i get nice batteries from??

 Those designed for digital cameras should work fine for servo application as both are higher current/shorter duration type loads. Any battery will have some limit of number of servos that can be manipulated simultaneously due to the specific battery's internal resistance rating.

13  Using Arduino / General Electronics / Re: Current rating on datasheet.. per channel or total? on: August 14, 2014, 01:34:46 pm
It's not a wattage spec, but a current spec.

The wattage-related limits can be calculated with the given specs and the operating values.

 I again disagree, maximum device power dissipation is not a current specification measured in amps. The datasheet is incomplete. Calculate all you want but you don't know what the total device power dissipation value is so can't tell if it's the limiting factor or not at any given voltage/current/# of outputs driven combination.

14  Using Arduino / General Electronics / Re: Current rating on datasheet.. per channel or total? on: August 14, 2014, 01:09:50 pm
Absolute Max Ground Current (IGND) ...................................... 3A
I'd say you'd have to split that among the 8 outputs.
As the maximum current shown in the tables is 350mA, you become the test pilot for higher currents.
What are you planning for source voltage? 5V? 12V?

Be careful. Since the circuit is a source driver array, IGND is mainly the sum of the currents thru the protection diodes, not thru the drivers.

Anyway, most of the time, the sum of the maximum currents thru output pins is less than the maximum currents thru the power supply pins.

  I still say the datasheet is still incomplete. Total device power dissipation will also be effected at the specific output voltage being used and the total device power dissipation will be different at different voltages.

The datasheet statement of:

These drivers can manage multiple loads of up to 50V and
500mA, limited only by package power dissipation.
Without stating the limit in wattage is incomplete.
15  Using Arduino / General Electronics / Re: Current rating on datasheet.. per channel or total? on: August 14, 2014, 12:20:36 pm
The datasheet is rather incomplete ( limited only by package power dissipation ) as it doesn't list the maximum power dissipation specification, so your question can't be answered without it. I'm pretty sure that package maximum power dissapation would be the limiting factor if all outputs were trying to supply 500 mA each, but again the specification needed is not provided.

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