Hi everyone,

I’m developing an electronics/monitoring system for an electric RC car and I’d like some advice before moving forward because my electronics knowledge is still fairly beginner/intermediate. The diagram below is only an initial concept/sketch of the system.

My goal is to:

• Monitor voltage and current from two batteries
• Use an ESP32 + Raspberry Pi for telemetry/data logging
• Control a brushless ESC
• Send data remotely through a router/modem
• Make the system reliable even with motor noise and vibrations

The setup currently includes:

• 2S battery (~8.4V) for the motor/ESC
• 3S battery (~12.6V) for electronics
• ESP32
• Raspberry Pi
• ADS1115 ADC
• Brushless ESC + motor
• Step-down and step-up regulators

My biggest doubts right now are related to current sensing and noise handling.

1. Current sensing

I’m considering three options:

• INA219 / INA226 / INA228
• ACS712
• Custom shunt resistor + differential amplifier/op amp

What would you recommend for:

• best accuracy
• better noise immunity
• reliability in a brushless RC environment
• reasonable cost

I’ve seen many people saying the ACS712 is noisy and not very precise for smaller currents, while INA-based sensors seem much better, but I’ve never used them before.

2. Noise from ESC and motor

Since this is a brushless motor with ESC, I expect a lot of:

• electrical noise
• spikes
• EMI
• ground noise

I’m thinking about using:

• decoupling capacitors
• RC filters
• ferrite beads
• separating logic and power grounds
• short wires
• maybe shielding sensitive parts

Does this make sense? Are there standard practices I should follow?

3. Voltage measurement

Right now I planned:

• resistor divider
• capacitor filter
• op amp buffer before the ADS1115

Would this improve stability/noise immunity or is it unnecessary?

4. ADC choice

I’m planning to use an ADS1115 over I2C because I’ve read that the ESP32 internal ADC can be noisy/inconsistent.

Is the ADS1115 a good choice for this application?

5. General architecture/layout

Would you recommend:

• separate regulators for logic and motor systems?
• isolation anywhere?
• special grounding strategies?
• TVS diodes or other protection?

Any feedback or criticism is welcome. I’m still learning and trying to avoid common mistakes before designing the final PCB.