The advent of Internet of Things opens the necessity to protect the flow of generated data. This implies having low cost, small and robust devices able to generate secure random numbers to encrypt the data. As a solution to this, we present a low cost and cheap fully integrated chip which is the building block of a quantum random number generator. This device can produce random number using quantum mechanics. This leads to two main advantages: first, since quantum mechanics is involved, the randomness of the generated sequence is guaranteed and robust to quantum computer attack; second, the small electronic chip can be easily implemented in existing devices since it is based on CMOS-compatible technology.