![]() ![]() ![]() My demo board has a red power indicator LED which came on once I powered up. Raspberry Pi showing GPIO cables connected. (These are what make the wires operate like a bus). These have the required 'pull up resistors' already installed. The cables must be connected to the Raspberry Pi GPIO pins nominated for I2C. Mine came with the required cables (often called dupont cables) which is also a handy way to start. The first step is to physically hook up the board. The board was only a few dollars there are also other similar boards on there. This provides a simple showcase for the chip and more importantly, it has a light sensor which is important to my project. I am using a pre-assembled board from Deal Extreme which comes with the chip, a temperature sensor, light sensor, variable resistor and LED. This chip has 4 analog inputs (ADC) and one analog output or Digital to Analog Converter (DAC). The first device I hooked to my Raspberry Pi is based on the PCF8591 Analog to Digital Converter (ADC).
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