The smallest DIY auto electrician's test board using Arduino
DIY auto electrician's test kit.
With it, we can find the ground; the display shows "ground," the LED lights up solid, and the buzzer emits a continuous beep.
Similarly, we can find the positive terminal and measure its voltage; in this case, the display will show the voltage value, the LED will flash, and the buzzer will emit an intermittent beep.
If we don't need the beep, we can simply disable the buzzer.
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Arduino control board with oscilloscope, CAN bus search, frequency counter, voltmeter, and continuity test functions: • Контролька автоэлектрика на Arduino, с фун...
[Board manager link]
http://drazzy.com/package_drazzy.com_...
[Libraries and sketch]
Downloading doesn't require registration or payment. Just click the green "CODE" button, then "Download ZIP."
https://github.com/chevichelov/MINI_C...
[Details]
4bit 7Seg I2C IIC https://aliexpress.ru/item/1005003898...
Digispark https://aliexpress.ru/item/1005003604...
SMD Capacitors 1206 https://aliexpress.ru/item/1005005398...
SMD Resistors 1206 https://aliexpress.ru/item/1005003547...
Zener Diode 5.1V https://aliexpress.ru/item/1005004215...
Active Buzzer https://aliexpress.ru/item/1005005185...