Hi out there
Could someone please help me to buy some of the diodes there are on the arduino board.
Deep link to ebay or aliexpress or so on. I need maybe 100 pieces or so, but it may not be over 10 USD. Incl. delivery. Color dosen't matter any color will do.
I dont know they name or how to use them therefore I need some help.
Please tell me if I will need some resistors too.
I will use it with 3 or 5 voltage.
Please help a newbie.
A selection of resistors is always useful. The "maker" retailers like Sparkfun, Adafruit or Radio Shack usually have a good deal on a resistor assortment with a few hundred resistors.
100 parts or even more - this sounds like it is going to be a commercial product.
however, any technical background on your side seems to be missing.
something seems to be wrong here.
Which diode?
There are three, and their required specs are totally different.
D1 should be a schottky diode capable of handling the full current the board can draw off the power jack.
Figure out what package it's in, then search ebay. I see prices around $5-10 shipped for common schottky diodes in lots of 100 (but I don't know which package you need). From digikey, looks like at least 12-14.
D2 can be any cheap signal diode.
D3 can be any cheap signal diode, and is probably entirely superfluous, since it's positioned to prevent the reset pin on the 16u2 from going above Vcc... but unlike the '328p's reset line, that on the 16u2 is not connected to a cap for autoreset, so there's no plausible way for the diode to be necessary.
Thanks for yours replys. It is not for commercial use, but I would try to do a strip for about 50-100 cm. With these small parts.
Maybe the send/recieve diodes.
I have had been done a few electronic projects. Now I just want to make a strip of diodes for soldering learing and for explore the parts.
Can you please point out the diodes for send/recieve and tell me some code number to where I can buy it on ebay or similar. + if it is nessary to use resistors as well when I will give them 3 or 5 voltage.
Hope you understand me. I know I dont have any electronic knowledge, but it will not stop me from trying to do it.
Please put me on the simple tracks.
hi
do you mean LEDs (light emitting diodes)?
in that case you have to calculate a minimum of 5 mA (milli Amperes) per LED. you will have to use a transistor or fet and resistors.
the absolute maximum of an ATmega chip (arduino board) is 200 mA. the maximum of a single output is 40 mA.
so please be careful and do more resaerch before you start your project.
Please excuse the rude German; he's new.
I think we are starting to get closer to the real question but there is still a little distance to go. If you explain what you are actually trying to do instead of how you think you might do it then you will get better answers.
Instead of asking "How do I buy 100 diodes," you should explain what you want to use them for. You want a strip of LEDs how long, how bright, what colour etc. If you want to light up a room or light up a kitchen cupboard, you will get different answers.
Or your question might be "I want to practice SMD soldering so what kit should I buy that will give me a useful object after it is assembled." It will also be helpful to know what through-hole projects you have already done as it is usually easier to start soldering on through-hole devices before upgrading to SMD.
the absolute maximum of an ATmega chip (arduino board) is 200 mA.
Incorrect - that is the max for each VCC or Gnd PIN:
DC Current VCC and GND Pins................................. 200.0mA
A chip with multiple pins can support more current, as evidenced by the notes following Table 29-1 for a '328P for example, where the currents thru the ports total to 300mA:
3. Although each I/O port can source more than the test conditions (20mA at VCC = 5V, 10mA at VCC = 3V) under steady state conditions (non-transient), the following must be observed:
ATmega48A/PA/88A/PA/168A/PA/328/P:
1] The sum of all IOH, for ports C0 - C5, D0- D4, ADC7, RESET should not exceed 150mA.
2] The sum of all IOH, for ports B0 - B5, D5 - D7, ADC6, XTAL1, XTAL2 should not exceed 150mA.
If IIOH exceeds the test condition, VOH may exceed the related specification. Pins are not guaranteed to source current greater than the listed test condition.
4. Although each I/O port can sink more than the test conditions (20mA at VCC = 5V, 10mA at VCC = 3V) under steady state conditions (non-transient), the following must be observed:
ATmega48A/PA/88A/PA/168A/PA/328/P:
1] The sum of all IOL, for ports C0 - C5, ADC7, ADC6 should not exceed 100mA.
2] The sum of all IOL, for ports B0 - B5, D5 - D7, XTAL1, XTAL2 should not exceed 100mA.
3] The sum of all IOL, for ports D0 - D4, RESET should not exceed 100mA.
If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test condition.
The LEDs I think are just 0805 size LEDs, pick your color, and brightness (mcd), example:
CrossRoads:
Incorrect - that is the max for each VCC or Gnd PIN:
DC Current VCC and GND Pins................................. 200.0mAA chip with multiple pins can support more current[...]
Generally speaking (not specificaly for the 328P), should one apply this rule regarding the total current, or the currents thru each supply pin?
For example, if I have a device with 2 sets or VCC/GND rated for 200 mA each. It's 400 mA for the device. Do I need to ensure that each set of pin does not see more than 200 mA? I'd assume that the answer is yes, but then my question is: how do I efficiently distribute the current between the 2 sets of pins?
Thru each supply pin. I have posted this info Directly from a query I made to Atmel application engineers.
http://forum.arduino.cc/index.php/topic,161354.new.html#new
Connect both supply pins to 20-24 mil wide traces, use decoupling caps, GND pins connected to a Gnd plane. That's all you need.