Power, voltage, and current
AliExpress: Matek Mini Power Hub
BUY FROM ALIEXPRESS
Matek Mini Power Hub.
AliExpress: INA 226 Power Monitoring Sensor
BUY FROM ALIEXPRESS
INA226 I2C Power Monitoring Sensor. Tracked, affiliate link.
AliExpress: 7V Buck Step Down Converter
If you decide to power the craft with 12 V instead of 7 V, you will need a converter for the sonar. For the standard 7 V battery pack used here, this buck converter is not needed.
BUY FROM ALIEXPRESS
DC 5-40V to 7.5V 1A Buck Step Down Converter. Tracked, affiliate link.