arduino 6v power supply

This is what I mean tinkering today, so I got my multimeter a unity it’s a bit of a cheapy, but it does meet just fine and I’ve been doing stuff. With this, where you’ve got an Arduino, you know a servo motor and a little board here. So this little board here I mean it – is just breaking out Arduino pins to the servo and also a separate battery supply for the server. Now I did this originally because I want to work out how I can use a software PWM to control a servo motor because, as I understand it, the breakout board I have for the the Wi Fi chip, which has its own GPIO s. Doesn’T have GPIO s with the only single pwm pin, but there are two pins on it, which is software GPIO, simple, onoff and I’m, wondering perhaps I could pulse them fast enough, using Hardware timers to control two servos. Ultimately, two continuous rotation servos. So this is just a simple Arduino board and then a simple board here when breaking out two of the pins and initially just to make sure the servos work, and so I could test see if any of them I had were continuous rotation. I thought I had some, I didn’t find any in my box and so just pins 9 and 10, which are oddly PWM split out to these, with some three pin headers connected to connect the servo and your node is here, and this R bring closer to the Camera, so you can see there are two diodes here now these two diodes are so actually I could power the Arduino from the batteries instead of from a USB port, but I can independently power it.

I got interested and that really just dessert out of there. So I could demonstrate it away from the thing and when I go to the Wi Fi chip I’ll be using a 3 volt regulator. Now the Arduino no runs on 5 volts or there abouts. Actually, the three to eight on board is a little bit voltage tolerant. So anywhere between about four point, six, four point: seven and five point: two volts is probably good enough and then I’ve got this battery box, which is four AAS choose about six volts I mean give or take obviously depending upon the age of the batteries, but those Give six volts and you can’t, put six volts through three to eight. I think you’d probably destroy it. So two diode drops each diode drops about not 0.6 volts, at least it does when the current is high enough. That then means with two naught point: six volt drops I’ve got a one point, two volt drop, which will bring this voltage down to about four point: eight volts. Now what I did earlier was. I sat named and went through some of the calculations of my little one, Elena who’s, just learning to add and showed how you add batteries and how you can add. Diode drops. I also then went and run the batteries with the multimeter through these two diode drops, and the first thing I did was instead of this Arduino being here, because I didn’t want to risk destroy my Arduino board.

I used a small resistor, so I’ll just go into a robot cupboard and I should have a resistor suitable here somewhere that I used earlier. So this is a 330 ohm resistor and that’ll give a reasonable enough amount. I didn’t write down the calculations. This will probably produce a slightly smaller current, but if it’s big enough to drive these so then they give that 1.2 volt drop across them. That’Ll do so let’s just take away the Arduino power and I’ll just pop in this resistor going across from this ground. Over here to the bottom, diode drop there. Now, if you don’t, have this resistor, if the only load you have it across is the multimeter you’ll see virtually no diode drop and nothing at all across it. So first thing is I’ve got this set to the 20 volt range. Tell you what let’s use a tilting, bail and let’s have that facing the camera. Okay, so let’s connect the batteries I will take out so go for now, because it’s, just clothing, review and and these batteries are giving six point two six volts that’s close enough. Okay and if I connect those so that’s now going straight across this resistor and I’m, going to connect that the wrong way up let’s get this the right way up. So we should see four point: seven volts, okay, it’s close to four point: eight volts it’s good enough and that will run the Arduino okay. And if I go halfway up five point, four seven and we go across to here and we’re at our six five.

Six point: one: seven: okay, there’s a bit of a current drains, have probably very slightly lower voltage in the open voltage. So I take away the resistor add back in the Aveeno board and there yeah it’s powering up. You can see the lights lighting or working nicely. If we hit the reset, we should see it flashing away, and then I stuck on a bit of simple code just to test sweeping the servos, because I just wanted to see that this servo was functional and then we have it. So the servo is being powered by the board and the Arduino is being powered by the board. So six bolts, two diodes. Okay, these are one n400, seven diodes they’re not getting even slightly warm there’s, actually not an awful lot of current going through the mirror. Each dropping or were sane or point 6 volts. Okay, so talking naught point 6 volts around about 78 million or less because they’re not powering this. They wrote it’s only the diode drop for the arduino that works out to be a relatively small number and we’re talking, and you know maybe 3040 milliwatts per diode, so that’s what I’ve been working on tonight. Thank you very much.


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Originally posted 2016-03-28 06:07:00.

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Comment (44)

    1. @Samuel Doye There’s an interview with me talking about armbot here:

  1. thanks for the vid! i have a question – i used a 4 AA battery holder thing and attached it to Vin and Ground on the arduino uno. when i do this, the board is on, but it won’t do the commands i uploaded to it. any idea why?

    1. ok. simple things- check polarity of the batteries. any lights on the arduino? are you sending commands via USB?

  2. thanks for the vid, may ask if there are any programs available because I’m a bit confused with what to do with my PWM, particularly pins 9 and 10, after I made the connections.

    1. +sic ninja did you mean demo code programs? Or YouTube video programs? There are Arduino samples for servo motor control – under file-> examples-> servo.

  3. Actually You won’t hurt yours Arduino by powering it by 4xAA battery connected directly to vcc. I’ve tried it, so no worries 🙂

    1. I suspect that the 328 is tolerant of a fair range – this depends on the model you have. The 328P datasheet says that 6V is the absolute maximum voltage. Beware that other things attached – sensors and similar may not be so tolerant.

  4. Using the power jack/plug adapted for batteries on the Arduino I have used as much as 12 v on the Arduino UNO V3 the UNO is happy with 9v as well; the on-board voltage regulator will drop the voltage down for the Arduino UNO and to 5v and 3v for any external senors or other devices, So I do not see the need for any diodes or resistors from the battery power source to run the Arduino,it will be happy with a full 7 volts too. Do not go over 12V.

    The diodes will not result in any harm but as your battery power becomes weaker the diodes will hasten the reduction in voltage. You might want to try a 6 V lantern battery that can sustain more current for a longer duration and the voltage will be more stable over a longer period of time, providing physical size of the battery is not an issue.

    It is not an absolute requirement but it is better to use a 2n2222 transistor to turn your servo motor off and on, safer for the Arduino. Or even use an opto isolator that way you do not have to worry about pulling to much current through the Arduino or voltage spikes from the motor..

    1. Hi there, thanks for your comment. Since this is intended for projects with limited size – ie small robots, 4xAA is about the right size. However – this is then about 6v – too high for the bare Arduino, too low for it’s regulator. I could use a USB battery pack perhaps to get 5v, and it may be able to drive a servo too – these have been improving fast, although would a servo work at that voltage.

      As for the current draw – I would assume that the pwm signal to the servo is all signal not driving power, and the current pull is on the voltage in line. I would (and often do) use an H-bridge for a DC motor or stepper.

  5. ok what if I wanted to power 4 servo motors ? im currently working the r680 banshi robotic arm for an electronics project. im using arduino instead of the included pcb. and I cant figure out the power problem 🙁

    1. I got the servos running but now im facing another problem! im uploading the code to arduino and when i power it on the servos keep rotating forever. any suggestions ?

    2. Sultan Kabboha can you show me your code? servo motors shouldn’t rotate continuously, although there is a kind modified to turn continuously.

    3. yes I discovered that continuous rotation servos are difficult to deal with. anyway i replaced that servo with a 180 degrees servo motor. im also using a gyroscope in attempt to control the servos with Pitch Roll Yaw directions. i only managed to get the accelerometer values in z and y dimensions only. im trying to map the x value to control the 3rd servo. can you help me ?

  6. hello there !! I’m working on a robotic arm contolled by arduino uno and 4 servos, can I power them with a 4AA batteries ? or I need another source of power please I need your help as fast as possible

    1. I will send you a video as soon as I assemble the project all together 😉
      do you know how to calibrate a color sensor tcs3200 ? it keeps on reading color even when I put white color on it !

    2. I will send you a video as soon as I assemble the project all together 😉
      do you know how to calibrate a color sensor tcs3200 ? it keeps on reading color even when I put white color on it !

  7. hey i wanted to follow but i have no knowledge about diodes and transistors and those electrical components, i just don’t know when to use it (i don’t wanna break my arduino :)) im simply trying to connect mg995 with arduino and power it with 6v batteries. Any suggestions for me to look up>?

    1. The arduino has its own regulator if you connect 6v to the vin pin it will regulate this to 5v for itself. Still, if you intend to share the batteries with motors, you may experience resets on the arduino when the motors pull power. Better to have separate batteries, or a big capacitor in parallel with the batteries.

    1. There is a link in the description for a Fritzing breadboard layout – it’s not quite the same a circuit diagram though.

  8. Can you please help me on servo controlling part, Whenever I was powering the servo from external 6 volt source and controlling the servo using Arduino wouldn’t work but

    1. Ah one sanity check, if you have an external power source, are the two grounds connected? They must share ground, or no signals will get through.

  9. I had made a buck converter circuit and i want to use the output voltage of that converter to power up servo motor,but when i connect the negative terminal of the output to the arduino ground,the output voltage drop suddenly,can you help me why this happen,tq

    1. Let me try to see if I get what you have. You have an input power source to the buck converter. On the buck converter output, you have, in parallel (can’t see if being anything else) an Arduino and a servo motor. You are seeing the voltage sag when you connect the arduino. Have I got that right?

    2. @Orionrobots yes,when i connect the ground from arduino to negative output of buck converter,the output voltage from buck cnverter drop

    3. Ok, what model arduino? What is the buck converter voltage output? What is the nominal current capacity of that buck converter? Does it drop with just the buck converter and arduino and no servo? Is the arduino separately powered or just from this converter?

    4. @Orionrobots i have got the solution,my mistake is actually because there is short circuit when i connect servo ground with buck cnvrter ground,anyway thanks for helping me

    5. Hmm, so the buck converter floating a ground at a different level from the supply ground then?
      I suppose I expected a T shaped configuration, ultimately with a shared ground.


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