The objective of this post is to explain how to create a simple LED Matrix using PNP transistors and a ULN2803A integrated circuit, and assuming that only one LED needs to be connected at each time.
This post describes one of the basic laws of circuit analysis, more precisely KCL (Kirchhoff’s Current Law), which states that the the sum of the currents leaving and entering a node is zero.
This post lists some cheap options for power supplies to use in electronic and embedded systems projects.
When developing for embedded systems, having knowledge about electronics gives much more freedom on what we can create. Instead of using only shields or demonstration boards, we can develop custom solutions for our needs, allowing for a greater efficiency and a lower cost.
This post explains some very basic principles about electronics, namely DC voltage sources and resistors. I’ll try to make some posts about more basic electronics every once in a while, in order to complement the other posts about embedded systems.