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Used hardware components

The main hardware components with some references.

ESP32 WROOM

ESP32-WROOM-32UE-N16

https://www.mouser.se/c/?q=ESP32-WROOM-32UE-N16

Motor-control

L293D (SMD)

https://www.mouser.se/datasheet/2/389/l293d-1849134.pdf

Ultrasonic sensor

HC-SR04

User-guide: https://www.handsontec.com/dataspecs/HC-SR04-Ultrasonic.pdf

Accelerometer/gyro

GY-521

https://www.instructables.com/GY-521-MPU6050-3-Axis-Acceleration-Gyroscope-6DOF-/ https://randomnerdtutorials.com/arduino-mpu-6050-accelerometer-gyroscope/#more-101585

Compass

GY-273

https://www.robotpark.com/GY-273-HMC5883L-3-Axis-Magnetic-Electronic-Compass

Power-supply

3xAA and a 3.3 low dropout voltage regulator LP2989 (SMD)

https://www.electrokit.com/upload/product/40352/40352989/LP2989.pdf

Add-ons for HW version 3

Support for a buck/boost regulator expansion-board, for a stable 5V (https://www.electrokit.com/switchregulator-step-up/step-down-5v-1a)
TTL-CMOS level converter for the echo signal
Analog voltage measurement for battery energy level
Status-led/neopixel

Material cost pcb HW version 2 with components (approx sek)

Around 300 sek divided as:

PCB (Aisler.net): 75
ESP32 (mouser.se): 40
L293 (mouser.se): 100
LP2989 (electrokit.se): 60
Pinheaders, smd-button, capacitors etc…

Material cost pcb HW version 3 with components (approx sek)

Around 350 sek divided as:

PCB (Aisler.net): 75
ESP32 (mouser.se): 40
L293 (mouser.se): 100
LP2989 (electrokit.se): 60
Buck/boost regulator (electrokit.se): 50
Level converter (electrokit.se): 20
Pinheaders, smd-button, capacitors etc…

Sensors etc

4*HC-SR04 (https://www.electrokit.com/avstandsmatare-ultraljud-hc-sr04-2-400cm)
1*GY-521 (https://www.electrokit.com/mpu-6050-accelerometer-3-axel-gyro-monterad-pa-kort)
1*GY-273 (https://www.electrokit.com/elektronisk-kompass-hmc5883l)
6*cables for the sensors (https://www.electrokit.com/labsladd-4-pin-100mm)

Programming interface

Something like this: https://www.electrokit.com/beefy-3-ftdi-breakout with some cables like this to fit the connector on the pcb: https://www.electrokit.com/labbsladd-40-pin-30cm-hona/hane