Hi, me again.
I was wondering if anyone would mind taking a look at my circuit. I’m fairly sure it’s a power issue (whether is a supply issue or my circuit setup) but was hoping I could get some help from you veterans.
Attached is a screencap of the breadboard setup, hopefully it’s laid out clearly enough. It takes a 4x AA battery supply (around 6.6volts when everything is fully charged) and runs it through a 7805 regulator to drop it to 5V. This is then run through some 100uF capacitors to smooth out the voltage and then sent to the second bus on the breadboard as 5V voltage. There is a LED hooked up so I know when it is powered on, and it’s also sent to the chip and crycstal where the sketch is running. This is all essentially supposed to be a replacement for the arduino Uno board, as the long term goal is to have the atmega328 chip permanently in the finished project bit not the Uno board so I can use it for other projects with a repalcement chip.
The power supply is also run off to a 7806 regulator to drop it to 6V. This supply is again run through some 100uF capacitors and is what powers all the servos. The servo signal wires are connected to the chip.
I’m trying to power the servos and the atmega328 chip off one power source but am running into some trouble. As it stands, I can power 2 servos with no problem in this setup, a 3rd sometimes and a 4th just stops everything working all together. During testing the battery voltage dropped below 6v, so I bypassed the 6v regulator connecting the servos to the power supply directly and all 4 servos moved (though a little weak). This is why I’m assuming it’s some sort of power or circuitry issue.
At the moment only 4 servos are connected which I’m struggling with, but the end goal is to have 6. Is my power source just completely inadequate or is there a problem with the circuit? If it’s a power source issue, could anyone recommend one to power 6 servos and the chip (preferably one that uses standard batteries or is a wallwart my only option?)?
I understand the regulators will limit current to 1A, is a wallwart with a 3A switching regulator my only option to move 6 servos and provide enough current to them so they can lift a load (if you need to know, the servos are HXT 900)?
I’ve tried looking for some robot tutorials (as that’s the only project I can think of that would use multiple servos and possibley standard batteries rather than specialized ones) but am trouble finding information as everyone wants to use kits and is simply saying “plug part A into part B”, which is no use if you want to actually learn why you’re using those components.
Really appreciate any help, even if it’s just to direct me to a post or tutorial or anything that can help.
Thanks in advance to anyone who tries to help!