Animatronic Robot Project - Servo and Sound Power Problems

Other Hardware Robotics
1

Hello all. I am making a 3D-printed droid model animatronic for my daughter. I am using an Arduino Nano connected to a wire terminal shield. Wired to the terminal shield are 2x SG51 servos, 2x 5mm RBG LEDs, 1x 3mm white LED, and a Dfplayer mini MP3 player.
• Initially, I use a Mini-b- 5 pin USB cable and then switch to an external power supply: 9V 2A.
• The Nano needs to receive 7V-12V.
• The input voltage for each servo is 4.8V to 6.0V.
• The input voltage for the DFPlayer is DC 3.2v to 5.0V.

Problem: It runs perfectly when I prototype the project and run it off the Mini-B 5-pin USB cable. But when I try to run it on the external power supply, only the lights turn on. The servos and sound don’t work.
I hope I have given enough information for someone to help me diagnose the problem. Thank you.

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Welcome to the forum

Please post your sketch, using code tags when you do, and a schematic of your project. A photo of a hand drawn circuit is good enough as long as it shows how the components are connected and powered

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The Nano 5V output cannot be used to power motors or servos, so you will need a separate stepdown converter. Plan on 1A per small servo, like one of these.

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Thanks for the fast reply.

"UKHeliBob", Here is the sketch and the circuit layout.

DD-L0-LA59-Instructions-V1.pdf (5.4 MB)

L0LA59_ver1.ino (15.4 KB)

"Jremington"here is a buck converter I have. Where should I put it in the circuit?

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