Advice on wiring multiple sensors to arduino uno

[JPD99]

Hi,
I am new to this forum and need some advice on my wiring scheme.
I am working on an autopilot project for my sailboat. I will be using different sensors to detect certain data for my autopilot to function correctly.

All sensors/servos operate at around 5V, the only component which needs more than 5 volts is the anemometer. I am powering everything with an 11.1 V, 2200 mAh battery. So I have to "divide" the battery voltage. And here is my first problem.

I have the following options:

1. use a linear voltage regulator
2. use a buck converter

I'd prefer to use a buck converter because it's much more efficient. But I am planning on installing a RF-module, so I am a bit worried it would interfere with it.

I'd be awsome, if someone could

1. tell me if my wiring is correct and my project actually would work
2. advice me on which option I should go for

Thanks a lot,
John

[terryking228]

Hi,
Quick look seems OK. The buck converter should be OK. But: What is the Mechanical design of this? Especially if you are concerned about RF interference, (And maybe weather protection) this should all go in a metal box of some type.

How much total 5V current do you need?

DISCLAIMER: Mentioning stuff from my own shop... but I like THIS UNO compatible that has built-in 5V 2A buck converter and easy-to-connect 3-pin connectors on all IOs.:

How big is the boat? Does it also have an engine / outboard? Are there metal devices that are in the (sea) water? THINK about "grounding".. Some suggestions HERE.

[JPD99]

Hi,

Tanks a lot for the quick response!

I was thinking of putting all the electronics into a plastic box (or metal box as you have mentioned).

I have yet to buy all the sensors, but I could give a very rough estimation on how much current it will need:

Arduino: 50mA - 200mA

Modules (GPS, RF-receiver, SD-card reader, Magnetometer, Anemometer): 20mA-50mA

Servo 1: winch servo, type: HS 785-HB, stall_current: 1500mA, running_current(no load): 230mA
---> average consumption probably around : 800mA
Servo 2: small 9g servo, estimated consumption: 100mA-300mA

So, all in all, I probably need about: 480mA-2250mA.

I might be well off, but with a 2200mAh battery, I should be able to power it for at least an hour.

The boat has a length of about 1 meter and has no engine/outboard. No metal devices are therefore in water.

Thanks for the links! This Uno compatible seems to be really good for my project! I might consider it.
The servos should be waterproof, I have checked that.
The best thing probably is to order the parts and then put everything together and test it!

Thanks again,
John

[wvmarle]

Try to find servos that can be powered directly from the battery, rather than through the buck converter. Servos can take a large surge when starting up, which the buck converter must be able to handle, otherwise you get voltage dips that may cause problems for your Arduino.
When connected directly to the battery that won't be an issue.

[TomGeorge]

Hi,
Welcome to the forum;
Ops diagram;

Tom...