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1  Using Arduino / Microcontrollers / Re: Atmega328p Power Saving Techniques on: April 11, 2013, 04:42:09 pm
this is a great thread...

i tested my setup which has a 3.3v regulator and also a tmp102 attached.

first i was having a SMD led for power indicator and while sleep it was asking for 3 mA while sleeping, i took that LED out and now it takes about .1mA sleeping with this code...
2  Using Arduino / Project Guidance / Re: Temperature display powered for ever !!! on: April 11, 2013, 01:22:26 pm
thanks guys...

i look at the schematics and yes, i think i am going to take that approach... just take what i need.

3  Using Arduino / Project Guidance / Re: Temperature display powered for ever !!! on: April 11, 2013, 10:09:56 am
thats a good idea but is kind big and 39 bucks
4  Using Arduino / Project Guidance / Temperature display powered for ever !!! on: April 11, 2013, 09:23:23 am
Hi guys

i need your help on this. I have this custom board build with a TMP102 sensor and a mega328, so far i am  able to get around 50 hours of operation with a 850 mha lipo battery. i am sleeping the arduino and then i wake it up with the watch dog timer, the average current comsume per hour is 12 to 15 mha. So i think thats good considering is a matrix display.

How ever i would like to have it outside for ever!!!

So since is low power  i think i can have it hook to a solar cell outside and when the solar cell is dead(cloudy or raining) i can power ir from my lipo battery.

I have this in hand

and for the solar cell i plan to use

now the issue i have is the circuit to select if i will be powering with battery,  use the solar panel as power or use the solar power and charge the battery at same time.

i dont know if the charger can be conected at all times and that will do the switching automatically when the solar power is dead.

if thats not the case i will need to use a voltage comparator to compare lipo againts solar cell and that will trigger to use battery? do you know any good circuits that will do this?


5  Using Arduino / Sensors / Re: MS5541 depth sensor communication on: March 22, 2013, 07:20:10 pm
your sensor is completely different, according to the data sheet this has an analog output which you will have to read with the arduino ADC..
6  Using Arduino / Programming Questions / ISP arduino ide uploading question on: March 22, 2013, 07:10:53 pm
Hi guys

please clear my questions

i know that with the ISP programer avr mkII you can burn the bootloader to a "blank" arduino... now that i burn the bootloader i am able to upload programs via the ftdi serial RIGHT?

I have an arduino with the bootloader, i have my sketch and i upload the program with my ISP programmer pressing shift and hiting the upload button. does this free some ram? or it is still uploading the bootloader?

i have a program where i ran out of ram when i load the program with the arduino having the bootloader...if i upload the program using the ISP  will i free some ram?

if i have an arduino with a booloader, could i erase the boot loader? with the avr mkII?

can i upload with a ISP the HEX generaterd by my arduino ide to a blank mega328 and save the ram?


7  Using Arduino / LEDs and Multiplexing / Power Leds 101 for begineers on: November 07, 2012, 09:19:33 am
So i just  to confirm i am understanding all the theory behind leds or power leds, to start a simple project.

So i have this led

Max Current 2A
Forward Voltage 6V

So from what i am reading

I will need a power supply bigger than the Forward Voltage of 6 V right?
so if i keep my voltage around 7 to 8 V it will be good. will it be better with 12 V?

if i use a second led in series my power supply has to be bigger than 12 V right because the voltage drop acrross each led will be 6V so 6 times 2 is 12 V..?

to prevent my  led from dimming i need to use a current driver(controller).  Rated for the current i want to operate my led, for example

it is rated for 700 ma so that will do the job right?

is there anything else i am missing?
8  Using Arduino / Project Guidance / Re: Arduino for industrial / commercial use? on: November 06, 2012, 09:56:58 am
it has been since may where i build 4 works stations at work with arduinos...

i am using the lpd8806 conected to two arduinos.. the arduinos communitcate with labview via Serial..

they workstations run 24/7, and so far so good, no problems at all during this 6 months...

what the arduinos do is they scan the barcode, labview search on database for the part, arduino lights with the lpd8806 where the assembly operator needs to grab the materials base on the part #, it has around 8 differnet pieces that con go assembled but depending on the part some pices may not be needed so arduino lights the lpd8806 that are covered with UHMW under the material bin so that tells the operator which materials to grab.

again it has been working 24/7, along with wood dust around...

so for me it has been pretty reliable..

another application is an arduino webserver,sd card and RTC hooked to a PLC via relays, and the arduino is running a HTML page and loggin cycle time information to the sd card...

i has been one month on the plc cabinet and no problems at all...

again reliable...
9  Using Arduino / Sensors / Re: MS5541 depth sensor communication on: November 06, 2012, 09:45:59 am
if someone is looking into this sensor i made this breakout board

you can now solder it...
10  Community / Exhibition / Gallery / Re: DiveDuino on: November 06, 2012, 09:44:40 am
I got the new board to mount the sensor and it worked !!!
11  International / Proyectos / Re: Ethernet + XBee + Arduino UNO auto reinicio de la placa on: November 05, 2012, 11:49:47 am
cuando la placa se reinicia sola y el programa esta bien escritor... quiere decir por lo regular es un problema de RAM, se esta agotando... trata de reducir el codigo o compra una arduino con mas capacidad
12  Using Arduino / Displays / Re: Power management with arduino sleeping on: November 05, 2012, 11:01:18 am

possible interesting read - -


13  Using Arduino / Displays / Re: Power management with arduino sleeping on: November 02, 2012, 02:03:40 pm
cool i will look into that..thanks
14  Using Arduino / Displays / Power management with arduino sleeping on: November 01, 2012, 07:28:04 am

So i have a question i hope you guys can help me...

i have my arduino hook to a lot of stuff :

so i want to implement some power saving here,  by sleeping the arduino and also block power to the LCD and open log..
i think that having and ouput from the arduino to a small relay to power the other electronics i do not know if there is an especial IC that does this ?

any recomendation for small solid state relays,that are surface mount?

15  Community / Exhibition / Gallery / Re: DiveDuino on: November 01, 2012, 05:22:42 am
I got the new board and worked on it. I take a look at the video...
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