March 2018
Beginner to intermediate
656 pages
20h 9m
English
Content preview from Mastering Blockchain - Second Edition
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Circuit
As shown in the following picture, the positive leg (long leg) of the LED is connected to pin number 21 of the GPIO, and the negative (short leg) is connected to the resistor, which is then connected to the ground (GND) pin of the GPIO. Once the connections are set up the ribbon cable can be used to connect to the GPIO connector on the Raspberry Pi simply.
Connections for components on the breadboard
Once the connections are set up correctly, and the Raspberry Pi has been updated with the appropriate libraries and Geth, the next step is to develop a simple, smart contract that expects a value. If the value provided to it is not what ...