[PAID] Help answering a basic wiring question

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1

I'm trying to finish making a kids Xmas present based on an Arduino project found online (below). This is a project that is very important to me personally, but I'm running into some trouble due to my inexperience with basic electronics.

I'm basically on step 2 of building this:

It's using an Arduino Uno compatible board (from an Elegoo Robot Car v4).

I anticipate this should more or less be as simple as "plug this wire in here and that one there, now test and see if it works...aaand we're done."

I'm offering $20 USD per 10 minutes ($120/hr) for someone to get on a quick video call with me asap and just tell me what wire needs to be attached where.

I don't use Facebook/Whatsapp or anything like that, so the videocall would be over Element Call / Jitsi (just click a link in a browser, no account needed).

It may take a bit of time to reply, depending on my work/email, so thanks for understanding!

2
  • Why not fully describe your situation, lots of volunteers here can help ?
  • You will need to come up with a schematic that we can read.
3

Asking a bunch of techies to click a link they never heard of is not a good way to start.

Did your kit come with instructions?
It sounds like you were unable to locate them. I think they are online, but not sure.
It is unlikely anyone can jump on a video call and just tell you to connect wire 1 to A and B. Those car kit companies change the design frequently.

4

Everything you need is on this PAGE

5 

  pinMode(IN1,OUTPUT);
  pinMode(IN2,OUTPUT);
  pinMode(IN3,OUTPUT);
  pinMode(IN4,OUTPUT);
  pinMode(EN_LEFT,OUTPUT);
  pinMode(EN_RIGHT,OUTPUT);
  pinMode(forwardInputPin, INPUT);
  pinMode(leftInputPin, INPUT);
  pinMode(rightInputPin, INPUT);

image
image500×333 28.6 KB

6

Thanks for your reply @LarryD ,
So the gist of it is that you build the robot car kit, which I've done, and then add some custom electronics to basically add 3 sensors that let a rat in a container on top turn the vehicle left/right or move it forward.

I've made the kit, but just don't know where to plug the writes of the extra electronics into. I've attached the circuit diagram and a photo from the page I linked to, burr I'm just having trouble with things like the fact that there're are about 4 places on the circuit board all labled "GND", and I'm not sure if I have things plugged in correctly on the bread board.

So in short, I'm just trying to figure out where to plug the wires and possibly resistors in!

Anyway, here's the schematic and photo:

FIXI7E3K3NPBZRV
FIXI7E3K3NPBZRV887×1024 90.2 KB

FKDX524K3NPC6KO
FKDX524K3NPC6KO1024×768 140 KB

7

GND is GND is GND. All Grounds are connected so use whatever is the most convenient.
We can't read the photo, and the schematic is what you should follow, what we need is what you ACTUALLY wirfed, so hand draw all the wires to show what each end is connected to. Take a picture and post that. That is step 1 of several.

8

The Instructable pretty much tells you how to do it.
Identify all the pins on the Arduino (look up) pinouts for the board in question.
The board in the photo looks more like a Nano than a Uno, though in practice, it makes no difference. The processor is the same.
List all the connections between the Arduino and the driver plus any others and carefully work through them.
Be especially careful not to let any damaging voltages or currents get near the Arduino.
The only bit that might cause problems is picking up the currents from the rat.
It might be worth looking at something like a transistor of a logic chip that work well with very small currents. A logic chip is something like a 4049.
A transistor like 2N3904 will switch an LED on simply by touching the transistor base with one finger and a voltage on the other hand.
A lot depends on the conductivity of the skin in question. Just wetting the fingers is enough.