missdrew:
I agree - normally a power source (A common point of failure) is specified at 110% at MINIMUM of the power requirment of a project, I normally try to provide a power supply of 150%, as the higher the overhead the easier the supply has to work & (in my head) should not be under any adverse straign.
Is that with or without the customary derating of Chinese made power supplies?
sabit068:
Hi! I have connected 16 DS18B20 temperature sensors with Arduino Mega by using 2 digital pins as one-wire bus. I also have a 20*4 LCD & an sd card module connected for data logging purposes. The problem is that, the sensors are not getting enough power. The power goes immediately after starting. I'm using a 5V 2A external adapter for the Arduino. Is there any solution? Should I use a 12V 2A adapter? Thanks in advance.
You need to post a diagram of exactly how you have connected these sensors, the arduino and the power
supply - a picture is much clearer than words for this.
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sabit068:
The problem is that, the sensors are not getting enough power. The power goes immediately after starting. I'm using a 5V 2A external adapter for the Arduino. Is there any solution? Should I use a 12V 2A adapter? Thanks in advance.
The solution will be found in a better definition of the problem. You might start by explaining how you know how the power goes immediately after start, what do you see, and how immediate is "immediate"? One thing you can be sure of is that, if you have a 5v 2A adapter in your hand, replacing it with a 12v 2A adapter is most definitely not a solution.
These sensors require a max of 1.5mA when active, and virtually nothing when not, which means that not providing enough power is rather difficult. You could supply the sensors direct from the adapter, but I don't think you should have to. You could prove the matter by removing all but a couple of the sensors.
One fair possibility is that you have wired the DS18B20s incorrectly, so you might check that. If you hold the sensors and they get very hot, you know where all the power is going.
We could also ask, if the DS18B20 are disconnected, do the LCD and SD card behave normally?
If yes, then we need to see more.
If not, we need to see more.
OP, the Guidelines for Reliable Long Line 1-Wire Networks article from Maxim may be of interest.
There is a whole lengthy discussion of this same question here. OP, do not cross post.
sabit068:
Arduino Mega by using 2 digital pins as one-wire bus.
Two data pins? For a single OneWire bus? That sounds like a mistake.
Are you using Parasitic Power (two wires) or are you running a 5V wire to the sensors, along with Ground and OneWire (three wires)?
Don't power up your sensors using Arduino Power Pin, instead design a small power supply. I normally use LM7805 and to increase the current rating, you can connect multiple ICs in parallel.
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oliviasmithh900:
Don't power up your sensors using Arduino Power Pin, instead design a small power supply. I normally use LM7805 and to increase the current rating, you can connect multiple ICs in parallel.
Or you can just use a 5V supply with sufficient current rating, even easier (and probably cheaper). 20A, 30A or more is readily available. After connecting the sensors, such a power supply no doubt has enough left to also power the Arduino.
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