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88 PCB007 MAGAZINE I SEPTEMBER 2024 ing features, WiFi, and analog/digital inputs that have various programming languages and abundant internet tutorials and soware, all for less than $78. 4 Programming e Micro:bit from the UK's BBC is utilized in the UK's middle and high schools to teach computer programming to students. ese are provided free to UK middle students and nearly four million have been sent out. I pur- chased one for my grandson for $16. As such, there are extensive lesson plans, soware, examples, and instructions available on the internet to learn microcomputer languages such as LINUX, Python, and C. Replenishment Replenishment of chemicals is accomplished with various valves, be they proportional or just on/off or with pumps, the replenishment-pro- portional pump being the most popular. You can fabricate systems with your own designs. Examples are shown in Figure 7. Examples e electroless copper controller was a par- ticular focus while I was a PCB process engi- neer. Aer visiting Photocircuits in Long Island, New York, and seeing the additive electroless copper controller in action, we (HP) decided to design and build one of our own. Figure 8 illustrates the process schematic Figure 7: Replenishment of chemicals is accomplished with various valves, be they proportional or just on/off or with pumps, the replenishment-proportional pump being the most popular.