Features: With fixing bolt holes for easy installation. Comparator output, clean signal, good waveform, strong driving ability, more than 15mA. The DO TTL digital output can also be connected to a microcontroller to detect whether there is rain. The Ao analog output can be connected to the AD port of the microcontroller to detect the amount of raindrops on it. The sensor is made of high-quality FR-04 double-sided material, and the surface is treated with nickel plating, which has superior performance in terms of anti-oxidation, electrical conductivity, and life. Specifications: Material: PCB Size: Approx. 3.2x1.4 for cm/1.26x0.55 in Working Voltage: 3.3V-5V Wiring: VCC: Connect to the positive pole of the power supply (3-5V) GND: Connect to the negative pole of the power supply DO: TTL switch signal output AO: Analog signal output Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 set Rain Sensor