PH Sensor Module with PH Probe - Water Quality Monitoring Sensor [C] Audio Amplifier 1 x 330 ohm 0603

1 x 330 ohm 0603 Package 1/10W SMD Resistor Reel

Raspberry Pi 2 Model B+

Connect the base terminal of the transistor to the 5V GPIO pin of the controller or V supply line of the Digital Circuit but care should be taken as it will need 120mA of base current if you are operating in high gain region

The Ultrasonic Sensor uses Ultrasonic waves to determine the distance of an object like Bats

it can easily be interfaced in with many microcontrollers and even can be used without a microcontroller

PH Sensor Module with PH Probe - Water Quality Monitoring Sensor [C] Audio Amplifier 1 x 330 ohm 0603The PH Sensor Module with PH Probe is a reliable and easy to use solution for measuring the acidity or alkalinity of liquids. The kit includes a high sensitivity pH probe and a signal conditioning module that outputs analog signals, making it suitable for DIY projects, aquariums, hydroponics, laboratory use, and industrial applications. Features: Measures pH levels accurately in the range of 0 to 14. Comes with a high quality pH glass electrode probe.