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Analog pH Sensor / Meter Kit specially designed for Arduino controllers and has convenient and practical "Gravity" connector and a bunch of features
SparkFun 16 Output I/O Expander Breakout - SX1509 can also act as a level shifter to connect a microcontroller running at one voltage level to a component running at a different voltage level
Digital interface : 5V TTL level UART interface
wireless GPIO pin control and much
The MAX471 can measures battery currents up to ±3A
Adapter Board for NRF24L01 Wireless Module 3.3V ATmega8-16PU Analog pH Sensor / MeterIntroduction : The working voltage of wireless module is generally 3. 3v, while that of 51 single chip computer is 5V. Suitable for 8 pin NRF24L01 + module Features : On AMS1117 chip Product size: 25. 5*21*15mm 1*0. 82*0. 59''
US$ 15.00
US$ 19.00
US$ 306.00