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Car Battery Wireless Voltmeter

Keep your eye on the battery state of charge

Car Battery Wireless Voltmeter
Granted, there are simpler ways to monitor your car battery voltage, but in the age of networked vehicles, we can exploit IoT technology, telemetry and network protocols so that you don’t even need to lift the hood.
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Components
Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list

Component List

R = 1kΩ 5%, 0.25W, 250V

R = 5.6kΩ 5%, 0.25W, 250V

MOD1 = MagI³C-FDSM Fixed Step Down Regulator

MOD2 = DHT11 from the Elektor-ESP32-Smart Kit

MOD3 = LoRa Nexus Board

MOD4 = RFM95 Ultra LoRa Transceiver Module (868 MHz)

Raspberry Pi 3 B+ Starter Kit + free RPi compilation

J1,J2 = jumper wires from the Elektor ESP32-Smart-Kit

(optional) Large plug board

(optional) FT232R-USB/Serial Bridge/BOB (Elektor no. 110553-91)

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