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InaMORAta: Difference between revisions
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A 12V plus ground pair are used from one of the hub's PWM hookups to drive a HiLetgo LM2596 buck converter. The LM2596 is configured to deliver 7.1V by adjusting a potentiometer. The output is displayed on the LM2596's LED. This is a safe output to drive both the Arduino and the Heltec. On the output side, we hook two barreljack pushbutton connectors up to the LM2596. One directly powers the Arduino. The other uses a microUSB adapter to power the Heltec. | A 12V plus ground pair are used from one of the hub's PWM hookups to drive a HiLetgo LM2596 buck converter. The LM2596 is configured to deliver 7.1V by adjusting a potentiometer. The output is displayed on the LM2596's LED. This is a safe output to drive both the Arduino and the Heltec. On the output side, we hook two barreljack pushbutton connectors up to the LM2596. One directly powers the Arduino. The other uses a microUSB adapter to power the Heltec. | ||
We will *not* be powering the fans or LEDs from the Arduino directly. They draw too | We will *not* be powering the fans or LEDs from the Arduino directly. They draw far too much current, and Arduinos can't provide 12V power anyway (well, unless you dump 12V in at the power jack, and then drive from VIN, but you're gonna be voltage regulating that 12 down to 5, and why burn dinosaurs when there's no need?). Everything else is powered by the hub directly. We only need 5V for the tachometer and PWM signals, but we need send 12V PWM to the LEDs. We thus connect another 12V plus ground pair to one side of the breadboard, where we'll feed it into MOSFETs (see below; we can probably eliminate the hub entirely). | ||
Everything else is powered by the hub directly. We only need 5V for the tachometer and PWM signals, but we need send 12V PWM to the LEDs. We thus connect another 12V plus ground pair to one side of the breadboard, where we'll feed it into MOSFETs. | |||
==Rotation count (RPMs)== | ==Rotation count (RPMs)== | ||
