Wireless voltage and resistance meter based on STC89S52 and bluetooth module HC-05

A wireless voltage and resistance meter based on STC89C52 and Bluetooth module HC-05 is introduced. The principle of voltage measurement and Bluetooth communication is introduced.The hardware circuit and the software program is analyzed. Measured data can be displayed on the LCD1602 or sent to the phone and computer through Bluetooth module HC-05. The measurement range of voltage is 0-5V and the maximum voltage error is 0.09V. The measuring resistance range is 20 ∼ 50K Ω and the maximum error is 395 Ω.