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Sunday, August 11, 2019

More power part 2

Part 1 of this post, click here...

I finally got the dc-dc converter installed, and also added a small green LED so I know when power is plugged in. The LED is powered off the 5v side of the converter, and has a 330 ohm current limiting resistor in series.

The wall wart plugs into the 12v In connector, which powers the dc-dc converter. The converter outputs 5vdc which powers the small green LED through a 330 ohm current limiting resistor. The 5vdc will also be distributed to all analog and digital ports. I say ports, because a port consists of three pins, ground, power, and signal. Signal is the one connected to the analog or digital pins so we can read a sensor. We are using the transistor to switch ground in and out, either complete, or break the circuit. Being on the ground side, we don't have to worry about the voltage drop across the transistor. I have a schematic in Part 1 of this post...

I added a row of 5 pins, positive and negative, to allow me to make use of the 5vdc, but mainly to make it easy for me to measure the voltage while I adjusted the pot on the converter.

At this point, I still need to distribute the positive 5v to the proper pins (replace all those nice neat red wires) and then add the rest of the transistors and their associated resistors...

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